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Results for " Planck Collaboration"

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Systematic Effects in CMB Polarization MeasurementsFeb 09 2005The cosmic microwave background polarization is rich of cosmological information complementary to those from temperature anisotropies. Linear polarization can be decomposed uniquely in two components of opposite parities, called E and B. While E mode ... More
The microwave sky after one year of Planck operationsOct 10 2011The ESA Planck satellite, launched on May 14th, 2009, is the third generation space mission dedicated to the measurement of the Cosmic Microwave Background (CMB), the first light in the Universe. Planck observes the full sky in nine frequency bands from ... More
In-medium two-nucleon properties in high electric fieldsFeb 09 1996The quantum mechanical two - particle problem is considered in hot dense nuclear matter under the influence of a strong electric field such as the field of the residual nucleus in heavy - ion reactions. A generalized Galitskii-Bethe-Salpeter equation ... More
The Planck missionMay 02 2014These lecture from the 100th Les Houches summer school on "Post-planck cosmology" of July 2013 discuss some aspects of the Planck mission, whose prime objective was a very accurate measurement of the temperature anisotropies of the Cosmic Microwave Background ... More
Fermi-LAT spectral analysis of Fermi, Planck, Swift and radio selected samples of AGNNov 02 2011Blazars are jet-dominated extragalactic objects characterized by the emission of strongly variable non-thermal radiation across the entire electromagnetic spectrum. Therefore, the study of blazars (and in general of radio loud AGN) through the use of ... More
Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometerMar 12 2018Aug 11 2018The process pp$\to\ell^+\ell^-$p$^{(*)}$, with $\ell^+\ell^-$ a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the first time at the LHC in pp collisions at $\sqrt{s} =$ 13 TeV. One of the two scattered ... More
EROS and MACHO Combined Limits on Planetary Mass Dark Matter in the Galactic HaloMar 08 1998The EROS and MACHO collaborations have each published upper limits on the amount of planetary mass dark matter in the Galactic Halo obtained from gravitational microlensing searches. In this paper the two limits are combined to give a much stronger constraint ... More
A Cross-correlation method to search for gravitational wave bursts with AURIGA and VirgoJan 24 2008We present a method to search for transient GWs using a network of detectors with different spectral and directional sensitivities: the interferometer Virgo and the bar detector AURIGA. The data analysis method is based on the measurements of the correlated ... More
Muon lifetime and muon captureJan 06 2004We present an introduction to the MuLAN and MuCAP experiments at PSI, which aim at high precision determinations of two fundamental Weak Interactions parameters: the Fermi constant $G_{F}$ and the induced pseudoscalar form factor $g_{p}$, respectively. ... More
ICRC 2015 proceedings: First combined search for neutrino point-sources in the Southern Sky with the ANTARES and IceCube neutrino telescopesNov 16 2015A search for cosmic neutrino point-like sources using the ANTARES and IceCube neutrino telescopes over the Southern Hemisphere is presented. The ANTARES data was collected between January 2007 and December 2012, whereas the IceCube data ranges from April ... More
Measurement of χ_cJ--> K+K-K+K-Jul 17 2006Aug 18 2006Using 14M psi(2S) events taken with the BES-II detector, chi_cJ-->K+K-K+K- decays are studied. For the four-kaon final state, the branching fractions are B(chi_c0,1,2 -->K+K-K+K-)=(3.48\pm 0.23\pm 0.47)\times 10^{-3}, (0.70\pm 0.13\pm 0.10)\times 10^{-3}, ... More
Exclusive $ρ^0$ production in deep inelastic electron-proton scattering at HERAJul 05 1995The exclusive production of $\rho^0$ mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have been measured in the range $7 < Q^2 < 25$ GeV$^2$ for $\gamma^*p$ centre of mass (c.m.) energies from ... More
Neutral strange particle production in deep inelastic scattering at HERAMay 18 1995This paper presents measurements of \k\ and \lam\ production in neutral current, deep inelastic scattering of 26.7 GeV electrons and 820 GeV protons in the kinematic range $ 10 < Q^{2} < 640 $ GeV$^2$, $0.0003 < x < 0.01$, and $y > 0.04$. Average multiplicities ... More
Measurement of the diffractive structure function in deep inelastic scattering at HERAMay 17 1995This paper presents an analysis of the inclusive properties of diffractive deep inelastic scattering events produced in $ep$ interactions at HERA. The events are characterised by a rapidity gap between the outgoing proton system and the remaining hadronic ... More
Measurement of multiplicity and momentum spectra in the current fragmentation region of the Breit frame at HERAJan 26 1995Charged particle production has been measured in Deep Inelastic Scattering (DIS) events using the ZEUS detector over a large range of $Q^2$ from 10 to $1280 {\rm\ GeV}^2$. The evolution with $Q$ of the charged multiplicity and scaled momentum has been ... More
Measurement of charm fragmentation fractions in photoproduction at HERAJun 20 2013The production of D^0, D^*+, D^+, D_s+ and Lambda_c^+ charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb^-1. The fractions of charm quarks hadronising into ... More
Scaled momentum spectra in deep inelastic scattering at HERAJan 22 2010Jun 28 2010Charged particle production has been studied in neutral current deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 0.44 fb^-1. Distributions of scaled momenta in the Breit frame are presented for particles in ... More
Measurement of J/psi photoproduction at large momentum transfer at HERAOct 07 2009Jun 23 2010The proton-dissociative diffractive photoproduction of J/psi mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 pb^-1. The cross section is presented as a function of the photon-proton centre-of-mass ... More
Multi-lepton production at high transverse momentum at HERAJun 08 2009Oct 13 2009A search for events containing two or more high-transverse-momentum isolated leptons has been performed in ep collisions with the ZEUS detector at HERA using the full collected data sample, corresponding to an integrated luminosity of 480 pb^{-1}. The ... More
Energy dependence of the charged multiplicity in deep inelastic scattering at HERAMar 27 2008May 15 2008The charged multiplicity distributions and the mean charged multiplicity have been investigated in inclusive neutral current deep inelastic $ep$ scattering with the ZEUS detector at HERA, using an integrated luminosity of 38.6 pb$^{-1}$. The measurements ... More
Beauty photoproduction measured using decays into muons in dijet events in ep collisions at $\sqrt{s}$=318 GeVDec 22 2003Sep 05 2006The photoproduction of beauty quarks in events with two jets and a muon has been measured with the ZEUS detector at HERA using an integrated luminosity of 110 pb$^{- 1}$. The fraction of jets containing b quarks was extracted from the transverse momentum ... More
Dijet photoproduction at HERA and the structure of the photonDec 19 2001Feb 27 2002The dijet cross section in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb$^{-1}$. The events were required to have a virtuality of the incoming photon, $Q^2$, of less than 1 GeV$^2$ and a photon-proton ... More
Measurement of inclusive prompt photon photoproduction at HERAOct 20 1999First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb$^{-1}$. Cross sections are given as a function of the pseudorapidity and ... More
Measurement of the E(T,jet)^2/Q^2 dependence of forward-jet production at HERAOct 20 1999The forward-jet cross section in deep inelastic ep scattering has been measured using the ZEUS detector at HERA with an integrated luminosity of 6.36 pb^-1. The jet cross section is presented as a function of jet transverse energy squared, E(T,jet)^2, ... More
ZEUS Results on the Measurement and Phenomenology of $F_2$ at Low x and Low Q^2Sep 07 1998Measurements of the proton structure function $F_2$ for $0.6 < Q^2 < 17 {GeV}^2$ and $1.2 \times 10^{-5} < x <1.9 \times 10^{-3}$ from ZEUS 1995 shifted vertex data are presented. From ZEUS $F_2$ data the slopes $dF_2/d\ln Q^2$ at fixed $x$ and $d\ln ... More
Diffractive Dijet Cross Sections in Photoproduction at HERAApr 23 1998Differential dijet cross sections have been measured with the ZEUS detector for photoproduction events in which the hadronic final state containing the jets is separated with respect to the outgoing proton direction by a large rapidity gap. The cross ... More
Study of the photon remnant in resolved photoproduction at HERAMay 03 1995Photoproduction at HERA is studied in $ep$ collisions, with the ZEUS detector, for $\gamma p$ centre-of-mass energies ranging from 130-270 GeV. A sample of events with two high-$p_T$ jets ($p_T > 6$ GeV, $\eta <1.6$) and a third cluster in the approximate ... More
Measurement of the Cross Section for the Reaction $γp \to \jpsi~p$ with the ZEUS Detector at HERAMar 27 1995This paper reports the cross section measurements for the process ep $\rightarrow$ e~\jpsi~p for $Q^2 < 4$ GeV$^2$ at $\sqrt s = 296$ GeV, based on an integrated luminosity of about 0.5~pb$^{-1}$, using the ZEUS detector. The \jpsi~was detected in its ... More
Jet production in high Q^2 deep-inelastic eo scattering at HERAFeb 06 1995Two-jet production in deep-inelastic electron-proton scattering has been studied for $160<Q^2<1280$~GeV$^2$, $0.01<x<0.1$ and $0.04<y<0.95$ with the ZEUS detector at HERA. The kinematic properties of the jets and the jet production rates are presented. ... More
Inclusive dijet cross sections in neutral current deep inelastic scattering at HERAOct 29 2010Single- and double-differential inclusive dijet cross sections in neutral current deep inelastic ep scattering have been measured with the ZEUS detector using an integrated luminosity of 374 pb^-1. The measurement was performed at large values of the ... More
A QCD analysis of ZEUS diffractive dataNov 23 2009ZEUS inclusive diffractive cross-section measurements have been used in a DGLAP next-to-leading-order QCD analysis to extract the diffractive parton distribution functions. Data on diffractive dijet production in deep inelastic scattering have also been ... More
Leading proton production in deep inelastic scattering at HERADec 12 2008The semi-inclusive reaction e+ p -> e+ X p was studied with the ZEUS detector at HERA using an integrated luminosity of 12.8 pb-1. The final-state proton, which was detected with the ZEUS leading proton spectrometer, carried a large fraction of the incoming ... More
Event shapes in deep inelastic scattering at HERAApr 16 2006Jun 16 2006Mean values and differential distributions of event-shape variables have been studied in neutral current deep inelastic scattering using an integrated {luminosity} of 82.2 pb$^{-1}$ collected with the ZEUS detector at HERA. The kinematic range was $80 ... More
Search for lepton-flavor violation at HERAJan 28 2005Sep 15 2005A search for lepton-flavor-violating interactions $e p \to \mu X $ and $e p\to \tau X $ has been performed with the ZEUS detector using the entire HERA I data sample, corresponding to an integrated luminosity of 130 pb^{-1}. The data were taken at center-of-mass ... More
Search for a narrow charmed baryonic state decaying to D^*+/- p^-/+ in ep collisions at HERASep 12 2004Oct 28 2004A resonance search has been made in the D^*+/- p^-/+ invariant-mass spectrum with the ZEUS detector at HERA using an integrated luminosity of 126 pb^-1. The decay channels D^*+ -> D^0 pi^+_s -> (K^- pi^+) pi^+_s and D^*+ -> D^0 pi^+_s -> (K^- pi^+ pi^+ ... More
Measurement of deeply virtual Compton scattering at HERAMay 14 2003Nov 05 2003The cross section for deeply virtual Compton scattering in the reaction ep -> e gamma p has been measured with the ZEUS detector at HERA using integrated luminosities of 95.0 pb-1 of e+p and 16.7 pb-1 of e-p collisions. Differential cross sections are ... More
A search for resonance decays to lepton+jet at HERA and limits on leptoquarksApr 04 2003A search for narrow-width resonances that decay into electron+jet or neutrino+jet has been performed with the ZEUS detector at HERA operating at center-of-mass energies of 300 and 318 GeV. An integrated e+p luminosity of 114.8 pb-1 and e-p luminosity ... More
Three-jet production in diffractive deep inelastic scattering at HERAJul 02 2001Three-jet production in the reaction ep --> eXp has been studied with the ZEUS detector at HERA using an integrated luminosity of 42.74 pb^-1. The data were measured in the kinematic region 5 < Q^2 < 100 GeV^2, 200 < W < 250 GeV and 23 < M_X < 40 GeV. ... More
Measurement of exclusive omega electroproduction at HERAJun 12 2000Jun 15 2000The exclusive electroproduction of omega mesons, ep -> e omega p, has been studied in the kinematic range 3<Q^2<20 GeV^2, 40<W<120 GeV and |t|<0.6 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 37.7 pb^{-1}. The omega mesons were ... More
Measurement of inclusive D*+- and associated dijet cross sections in photoproduction at HERAJul 08 1998Inclusive photoproduction of D*+- mesons has been measured for photon-proton centre-of-mass energies in the range 130 < W < 280 GeV and a photon virtuality Q^2 < 1 GeV^2. The data sample used corresponds to an integrated luminosity of 37 pb^-1. Total ... More
Production of Lambda, Cascade and Omega Hyperons in ppbar Collisions at1.96 TeV Center of Mass EnergyJan 15 2011We report a set of measurements of inclusive invariant transverse momentum differential cross sections of lambda, cascade and omega hyperons reconstructed in the central region with pseudorapidity within 1 and transverse momentum up to 10 GeV/c Events ... More
Search for charged Higgs bosons in decays of top quarks in p-pbar collisions at sqrt(s) = 1.96 TeVJul 07 2009Sep 04 2009We report the recent charged Higgs search in top quark decays in 2.2/fb CDF data. This is the first attempt to search for charged Higgs using fully reconstructed mass assuming H->c-sbar in small tan beta region. No evidence of a charged Higgs is observed ... More
Inclusive Search for New Physics with Like-Sign Dilepton Events in ppbar Collisions at sqrt{s} = 1.96 TeVFeb 28 2007Jun 04 2007We describe a search for anomalous production of events with two leptons ($e$ or $\mu$) of the same electric charge in \ppbar collisions at a center-of-mass energy of 1.96 TeV. Many extensions to the standard model predict the production of two leptons ... More
Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s) = 1.96 TeVJun 07 2006Jul 27 2006We present a measurement of the top quark pair production cross section in ppbar collisions at sqrt(s)=1.96 TeV using 318 pb^{-1} of data collected with the Collider Detector at Fermilab. We select ttbar decays into the final states e nu + jets and mu ... More
Measurements of Bottom Anti-Bottom Azimuthal Production Correlations in Proton-Antiproton Collisions at s**(1/2)= 1.8 TeVDec 01 2004May 05 2005We have measured the azimuthal angular correlation of bottom anti-bottom production, using 86.5 pb-1 of data collected by Collider Detector at Fermilab (CDF) in proton anti-proton collisions at sqrt{s}=1.8 TeV during 1994-1995. In high-energy p-pbar collisions, ... More
Search for New Physics in Lepton + Photon + X Events with L=305 pb-1 of ppbar Collisions at roots=1.96 TeVMay 22 2006Jul 10 2006We present results of a search for anomalous production of events containing a charged lepton (either electron or muon) and a photon, both with high transverse momentum, accompanied by additional signatures, X, including missing transverse energy (MET) ... More
Measurement of $σ(Λ_b)/σ(B^0) \times BR(Λ_b\toΛ_cπ^-) / BR(B^0\to D^+π^-)$ in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeVJan 01 2006We present the first observation of the baryon decay $\Lambda_b\to\Lambda_c\pi^-$ followed by $\Lambda_c\to p K^-\pi^+$ in 106 pb-1 of $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV in the CDF experiment. In order to reduce systematic error, the measured ... More
Search for Anomalous Production of Diphoton Events with Missing Transverse Energy at CDF and Limits on Gauge-Mediated Supersymmetry-Breaking ModelsOct 19 2004Feb 14 2005We present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In 202 $\invpb$ of $\ppbar$ collisions at $\sqrt{s}=1.96$ TeV we observe no candidate events, ... More
First Measurement of the Ratio B(t-->Wb)/B(t-->Wq) and Associated Limit on the CKM Element VtbDec 11 2000We present the first measurement of the ratio of branching fraction R= B(t-->wb)/B(t-->Wq) from ppbar collisions at sqrt(s)=1.8 TeV. The data set corresponds to 109 pb-1 of data recorded by the Collider Detector at Fermilab during the 1992-1995 Tevatron ... More
Measurement of the Two-Jet Differential Cross Section in proton-antiproton Collisions at sqrt{s} = 1800 GeVDec 05 2000A measurement is presented of the two-jet differential cross section, d^3\sigma/dE_T d\eta_1 d\eta_2, at center of mass energy sqrt{s} = 1800 GeV in proton-antiproton collisions. The results are based on an integrated luminosity of 86 pb^-1 collected ... More
Search for Neutral Supersymmetric Higgs Bosons in $p\bar{p}$ Collisions at $\sqrt{s}=1.8$ TeVOct 20 2000Oct 30 2000We present the results of a search for neutral Higgs bosons produced in association with $b$ quarks in $p\bar{p}\to b\bar{b} \phi\to b\bar{b}b\bar{b}$ final states with $91 \pm 7$ pb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV recorded by the ... More
Search for Second and Third Generation Leptoquarks Including Production via Technicolor Interactions in $p \bar{p}$ collisions at $\sqrt{s}=1.8$ TeVApr 03 2000We report the results of a search for second and third generation leptoquarks using 88 ${pb}^{-1}$ of data recorded by the Collider Detector at Fermilab. Color triplet technipions, which play the role of scalar leptoquarks, are investigated due to their ... More
Search for Scalar Top and Scalar Bottom Quarks in $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeVOct 22 1999We have searched for direct pair production of scalar top and scalar bottom quarks in 88 pb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV with the CDF detector. We looked for events with a pair of heavy flavor jets and missing energy, consistent ... More
Search for a Higgs boson in the mass range from 145 to 1000 GeV decaying to a pair of W or Z bosonsApr 03 2015A search for a heavy Higgs boson in the H to WW and H to ZZ decay channels is reported. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 inverse femtobarns at sqrt(s)=7 TeV and up to ... More
Measurement of the ZZ production cross section and Z to l+l-l'+l'- branching fraction in pp collisions at sqrt(s) = 13 TeVJul 29 2016Four-lepton production in proton-proton collisions, pp to (Z/gamma*)(Z/gamma*) to l+l-l'+l'-, where $l, l' = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity ... More
Search for the Standard Model Higgs boson in the two photon decay channel with the ATLAS detector at the LHCAug 30 2011Dec 09 2011A search for the Standard Model Higgs boson in the two photon decay channel is reported, using 1.08 fb^-1 of proton-proton collision data at a centre-of-mass energy of 7 TeV recorded by the ATLAS detector. No significant excess is observed in the investigated ... More
Measurement of the W to tau nu Cross Section in pp Collisions at sqrt(s) = 7 TeV with the ATLAS experimentAug 20 2011Dec 02 2011The cross section for the production of W bosons with subsequent decay W to tau nu is measured with the ATLAS detector at the LHC. The analysis is based on a data sample that was recorded in 2010 at a proton-proton center-of-mass energy of sqrt(s) = 7 ... More
Search for contact interactions in dilepton events from pp collisions at sqrt(s) = 7 TeV with the ATLAS detectorDec 19 2011May 23 2012This Letter presents a search for contact interactions in the dielectron and dimuon channels using data from proton-proton collisions produced by the LHC at sqrt(s) = 7 TeV and recorded by the ATLAS detector. The data sample, collected in 2011, corresponds ... More
Measurement of D*+/- meson production in jets from pp collisions at sqrt(s) = 7 TeV with the ATLAS detectorDec 19 2011Apr 11 2012This paper reports a measurement of D*+/- meson production in jets from proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 TeV at the CERN Large Hadron Collider. The measurement is based on a data sample recorded with the ATLAS detector ... More
Search for scalar bottom pair production with the ATLAS detector in pp collisions at sqrt(s) = 7 TeVDec 16 2011May 07 2012The results of a search for pair production of the scalar partners of bottom quarks in 2.05 fb^-1 of pp collisions at sqrt{s} = 7 TeV using the ATLAS experiment are reported. Scalar bottoms are searched for in events with large missing transverse momentum ... More
Search for New Phenomena in ttbar Events with Large Missing Transverse Momentum in Proton-Proton Collisions at sqrt(s) = 7 TeV with the ATLAS DetectorSep 22 2011Dec 05 2011A search for new phenomena in ttbar events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is based on 1.04 fb^-1 of data collected with the ATLAS detector at the LHC. ... More
Search for Quark Contact Interactions in Dijet Angular Distributions in pp Collisions at sqrt(s) = 7 TeV Measured with the ATLAS DetectorSep 26 2010Dijet angular distributions from the first LHC pp collisions at center-of-mass energy sqrt(s) = 7 TeV have been measured with the ATLAS detector. The dataset used for this analysis represents an integrated luminosity of 3.1 pb-1. Dijet $\chi$ distributions ... More
Measurement of the transverse momentum distribution of W bosons in pp collisions at sqrt(s) = 7 TeV with the ATLAS detectorAug 31 2011Dec 28 2011This paper describes a measurement of the W boson transverse momentum distribution using ATLAS pp collision data from the 2010 run of the LHC at sqrt(s) = 7 TeV, corresponding to an integrated luminosity of about 31 pb^-1. Events from both W -> e nu and ... More
A measurement of the ratio of the W and Z cross sections with exactly one associated jet in pp collisions at sqrt(s) = 7 TeV with ATLASAug 24 2011Feb 10 2012The ratio of production cross sections of the W and Z bosons with exactly one associated jet is presented as a function of jet transverse momentum threshold. The measurement has been designed to maximise cancellation of experimental and theoretical uncertainties, ... More
Search for neutral MSSM Higgs bosons decaying to tau^+ tau^- pairs in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detectorJul 25 2011Dec 07 2011A search for neutral Higgs bosons decaying to pairs of tau leptons with the ATLAS detector at the LHC is presented. The analysis is based on proton-proton collisions at a center-of-mass energy of 7 TeV, recorded in 2010 and corresponding to an integrated ... More
Measurement of the transverse momentum distribution of Z/gamma* bosons in proton-proton collisions at sqrt(s)=7 TeV with the ATLAS detectorJul 12 2011Dec 06 2011A measurement of the Z/gamma* transverse momentum (p_T^Z)) distribution in proton-proton collisions at sqrt(s)=7 TeV is presented using Z/gamma*->e+e- and Z/gamma*->mu+mu- decays collected with the ATLAS detector in data sets with integrated luminosities ... More
Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS experimentDec 18 2015In the $pp \rightarrow t\bar{t}$ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the ... More
Measurement of the Branching Fraction for J/ψ-> p \bar{p}ηand p \bar{p} η^{'}Feb 20 2009Using 58$\times 10^{6}$ $\jpsi$ events collected with the Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC), the branching fractions of $\jpsi$ to $p\bar{p}\eta$ and $p\bar{p}\etap$ are determined. The ratio $\frac{\Gamma(\jpsi\rar\ppb\eta)}{\Gamma(\jpsi\rar\ppb)}$ ... More
Inclusive Production of the omega and eta Mesons in Z Decays, and the Muonic Branching Ratio of the omegaJan 08 2002The inclusive production of the omega(782) vector meson in hadronic Z decays is measured and compared to model predictions. The analysis is based on 4 million hadronic Z decays recorded by the ALEPH detector between 1991 and 1995. The production rate ... More
Search for scalar leptons in e+e- collisions at centre-of-mass energies up to 209GeVDec 07 2001A search for selectron, smuon and stau pair production is performed with the data collected by the ALEPH detector at LEP at centre-of-mass energies up to 209 GeV. The numbers of candidate events are consistent with the background predicted by the Standard ... More
Observation of an Excess in the Search for the Standard Model Higgs Boson at ALEPHNov 15 2000A search has been performed for the Standard Model Higgs boson in the data sample collected with the ALEPH detector at LEP, at centre-of-mass energies up to 209GeV. An excess of 3sigma beyond the background expectation is found, consistent with the production ... More
Study of Charm Production in Z DecaysSep 20 1999The production rates of D*+-, Ds*+-, D+-, D0 / D0bar, Ds+, and Lambda_c in Z to ccbar decays are measured using the LEP I data sample recorded by the ALEPH detector. The fractional energy spectrum of the D*+- is well described as the sum of three contributions: ... More
Determination of the LEP centre-of-mass energy from Zgamma eventsJul 21 1999Radiative returns to the Z resonance (Zgamma events) are used to determine the LEP2 centre-of-mass energy from the data collected with the ALEPH detector in 1997. The average centre-of-mass energy is measured to be: E_CM = 182.50 +- 0.19(stat) +- 0.08(syst) ... More
Search for Single Top Production in e+e- Collisions at sqrt(s) up to 209GeVJun 27 2002Single top production via the flavour changing neutral current reactions e+e- -> \bar{t}c, \bar{t}u is searched for within the 214 pb-1 of data collected by ALEPH at centre-of-mass energies between 204 and 209 GeV. No deviation from the Standard Model ... More
Measurement of W-pair production in e+e- collisions at 189GeVMay 29 2000The production of W-pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 174.2 pb^-1. Cross sections are given for different topologies of W decays into leptons ... More
Search for B0s oscillations using inclusive lepton eventsNov 11 1998A search for B0s oscillations is performed using a sample of semileptonic b-hadron decays collected by the ALEPH experiment during 1991-1995. Compared to previous inclusive lepton analyses, the proper time resolution and b-flavour mistag rate are significantly ... More
Search for sleptons in e+e- collisions at centre-of-mass energies of 161 GeV and 172 GeVJun 04 1997The data recorded by the ALEPH experiment at LEP at centre-of-mass energies of 161 GeV and 172 GeV were analysed to search for sleptons, the supersymmetric partners of leptons. No evidence for the production of these particles was found. The number of ... More
Measurement of the Inclusive Jet Cross Section in pp Collisions at sqrt(s) = 7 TeVJun 01 2011The inclusive jet cross section is measured in pp collisions with a center-of-mass energy of 7 TeV at the LHC using the CMS experiment. The data sample corresponds to an integrated luminosity of 34 inverse picobarns. The measurement is made for jet transverse ... More
Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeVFeb 09 2011Feb 10 2011Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the CMS detector at the LHC, using a data sample corresponding to an integrated luminosity of 6.7 inverse microbarns. Jets are reconstructed using ... More
Search for Stopped Gluinos in pp collisions at sqrt s = 7 TeVNov 26 2010The results of the first search for long-lived gluinos produced in 7 TeV pp collisions at the CERN Large Hadron Collider are presented. The search looks for evidence of long-lived particles that stop in the CMS detector and decay in the quiescent periods ... More
Charged particle multiplicities in pp interactions at sqrt(s) = 0.9, 2.36, and 7 TeVNov 24 2010Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of sqrt(s) = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from |eta|<0.5 to ... More
Performance of the CMS Hadron Calorimeter with Cosmic Ray Muons and LHC Beam DataNov 26 2009Jan 03 2010The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various ... More
Calibration of the CMS Drift Tube Chambers and Measurement of the Drift Velocity with Cosmic RaysNov 25 2009Jan 14 2010This paper describes the calibration procedure for the drift tubes of the CMS barrel muon system and reports the main results obtained with data collected during a high statistics cosmic ray data-taking period. The main goal of the calibration is to determine, ... More
Commissioning of the CMS High-Level Trigger with Cosmic RaysNov 25 2009Jan 19 2010The CMS High-Level Trigger (HLT) is responsible for ensuring that data samples with potentially interesting events are recorded with high efficiency and good quality. This paper gives an overview of the HLT and focuses on its commissioning using cosmic ... More
Commissioning of the CMS Experiment and the Cosmic Run at Four TeslaNov 25 2009Jan 19 2010The CMS Collaboration conducted a month-long data-taking exercise known as the Cosmic Run At Four Tesla in late 2008 in order to complete the commissioning of the experiment for extended operation. The operational lessons resulting from this exercise ... More
Long-range and short-range dihadron angular correlations in central PbPb collisions at a nucleon-nucleon center of mass energy of 2.76 TeVMay 12 2011First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV over a broad range in relative pseudorapidity, Delta(eta), and the full range of relative ... More
Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray RunNov 25 2009Jan 15 2010The alignment system for the muon spectrometer of the CMS detector comprises three independent subsystems of optical and analog position sensors. It aligns muon chambers with respect to each other and to the central silicon tracker. System commissioning ... More
Time Reconstruction and Performance of the CMS Electromagnetic CalorimeterNov 20 2009Dec 21 2009The resolution and the linearity of time measurements made with the CMS electromagnetic calorimeter are studied with samples of data from test beam electrons, cosmic rays, and beam-produced muons. The resulting time resolution measured by lead tungstate ... More
Spatially Resolving the Very High Energy emission from MGRO J2019+37 with VERITASApr 07 2014We present very high energy (VHE) imaging of MGRO J2019+37 obtained with the VERITAS observatory. The bright extended ($\sim2^{\circ}$) unidentified Milagro source is located towards the rich star formation region Cygnus-X. MGRO J2019+37 is resolved into ... More
Quenched Light Hadron Mass Spectrum and Decay Constants: the effects of $O(a)$-Improvement at $β=6.2$Jul 09 1993We compare the light hadron spectrum and decay constants for quenched QCD at $\beta=6.2$ using an $O(a)$-improved nearest-neighbour Wilson fermion action with those obtained using the standard Wilson fermion action on the same set of 18 gauge configurations. ... More
Observation of the baryonic decay $\bar{B}^0 \to Λ^+_c \bar{p} K^- K^+$Oct 14 2014Mar 31 2015We report the observation of the baryonic decay $\bar{B}^0 \to \Lambda^+_c \bar{p} K^- K^+$ using a data sample of $471 \times 10^6$ $B\bar{B}$ pairs produced in $e^+e^-$ annihilations at $\sqrt{s}=10.58 \mathrm{\,GeV}$. This data sample was recorded ... More
Measurement of the integrated luminosities of the data taken by BESIII at $\sqrt s=$ 3.650 and 3.773 GeVJul 08 2013Data sets were collected with the BESIII detector at the BEPCII collider at the center-of-mass energy of $\sqrt s =$ 3.650 GeV during May 2009 and at $\sqrt s=$ 3.773 GeV from January 2010 to May 2011. By analyzing the large angle Bhabha scattering events, ... More
Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative DecaysDec 05 2011A partial wave analysis of the $p \bar{p}$ mass-threshold enhancement in the reaction $J/\psi\rightarrow\gamma p\bar{p}$ is used to determine: its $J^{PC}$ quantum numbers to be $0^{-+}$; its peak mass to be below threshold at $M=1832^{+19}_{-5} {\rm(stat.)}^{+18}_{-17} ... More
Higher-order multipole amplitude measurement in $ψ(2S)\toγχ_{c2}$Oct 08 2011Nov 23 2011Using $106\times10^6$ $\psi(2S)$ events collected with the BESIII detector at the BEPCII storage ring, the higher-order multipole amplitudes in the radiative transition $\psi(2S)\to\gamma\chi_{c2}\to\gamma\pi\pi/\gamma KK$ are measured. A fit to the $\chi_{c2}$ ... More
Measurement of the branching fractions for $B^0 \to D_s^{*+}π^-$ and $B^0 \to D_s^{*-}K^+$ decaysDec 14 2009Jan 23 2010We present a study of $B^0 \to D_s^{*+}\pi^-$ and $B^0 \to D_s^{*-}K^+$ decays based on a sample of $657 \times 10^6$ $B\bar{B}$ events collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We measure the branching fractions ... More
Measurement of the asymmetry parameter for the decay $\barΛ\to \bar pπ^+$Nov 16 2009Mar 18 2010Based on a sample of $58\times10^6J/\psi$ decays collected with the BESII detector at the BEPC, the $\bar\Lambda$ decay parameter $\alpha_{\bar\Lambda}$ for $\bar\Lambda\to \bar p \pi^+$ is measured using about 9000 $J/\psi\to\Lambda\bar\Lambda\to p \bar ... More
Tests of CPT symmetry in B0-B0bar mixing and in B0 -> c cbar K0 decaysMay 15 2016Jul 13 2016Using the eight time dependences for the decays Upsilon(4S)-> B0 B0bar -> fj fk with the dacay into a flavor-specific state fj = ell+- X before or after the decay into a CP eigenstate fk = c cbar KS,KL, as measured by the BABAR experiment, we determine ... More
Search for W' decaying to tau lepton and neutrino in proton-proton collisions at sqrt(s) = 8 TeVAug 18 2015The first search for a heavy charged vector boson in the final state with a tau lepton and a neutrino is reported, using 19.7 inverse femtobarns of LHC data at sqrt(s) = 8 TeV. A signal would appear as an excess of events in kinematic regions where the ... More
Study of hard double-parton scattering in four-jet events in $pp$ collisions at $\sqrt{s} = 7$ TeV with the ATLAS experimentAug 05 2016Inclusive four-jet events produced in proton--proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV are analysed for the presence of hard double-parton scattering using data corresponding to an integrated luminosity of 37.3 pb$^{-1}$, collected ... More
Cosmic Ray Positrons at High Energies: A New MeasurementMay 30 1995We present a new measurement of the cosmic-ray positron fraction e+/(e+ + e-) obtained from the first balloon flight of the High Energy Antimatter Telescope (HEAT). Using a magnet spectrometer combined with a transition radiation detector, an electromagnetic ... More