Latest in hep-ex

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The Role of Lattice QCD in Searches for Violations of Fundamental Symmetries and Signals for New PhysicsApr 22 2019This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for Lattice Quantum Chromodynamics (LQCD) in the research frontier in fundamental symmetries and signals for new physics. LQCD, in synergy with ... More
Measurement of the $ν_μ$ charged-current cross sections on water, hydrocarbon, iron, and their ratios with the T2K on-axis detectorsApr 21 2019We report a measurement of the flux-integrated $\nu_{\mu}$ charged-current cross sections on water, hydrocarbon, and iron in the T2K on-axis neutrino beam with a mean neutrino energy of 1.5 GeV. The measured cross sections on water, hydrocarbon, and iron ... More
Opportunities for lattice QCD in quark and lepton flavor physicsApr 20 2019This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD in quark and lepton flavor physics. New data generated at Belle II, LHCb, BES III, NA62, KOTO, and Fermilab E989, combined with ... More
Physics potential of the International Axion Observatory (IAXO)Apr 19 2019We review the physics potential of a next generation search for solar axions: the International Axion Observatory (IAXO). Endowed with a sensitivity to discover axion-like particles (ALPs) with a coupling to photons as small as $g_{a\gamma}\sim 10^{-12}$ ... More
The expectation of cosmic ray proton and helium energy spectrum below 4 PeV measured by LHAASOApr 19 2019Large High Altitude Air Shower Observatory(LHAASO) is a composite cosmic ray observatory consisting of three detector arrays: kilometer square array (KM2A) which includes the electromagnetic detector array and muon detector array, water Cherenkov detector ... More
Efficient $2^3S$ positronium production by stimulated decay from the $3^3P$ levelApr 18 2019We investigate experimentally the possibility of enhancing the production of $2^3S$ positronium atoms by driving the $1^3S$-$3^3P$ and $3^3P$-$2^3S$ transitions, overcoming the natural branching ratio limitation of spontaneous decay from $3^3P$ to $2^3S$. ... More
FPGA-accelerated machine learning inference as a service for particle physics computingApr 18 2019Large-scale particle physics experiments face challenging demands for high-throughput computing resources both now and in the future. New heterogeneous computing paradigms on dedicated hardware with increased parallelization, such as Field Programmable ... More
Sub-GeV Dark Matter Searches and Electric Field Studies for the LUX and LZ ExperimentsApr 18 2019The nature of dark matter (DM) remains a mystery since it has so far eluded detection in the laboratory. To that end, the Large Underground Xenon (LUX) experiment was built to directly observe the interaction of DM with xenon target nuclei. LUX acquired ... More
The Polarized Two-Loop Massive Pure Singlet Wilson Coefficient for Deep-Inelastic ScatteringApr 18 2019We calculate the polarized massive two--loop pure singlet Wilson coefficient contributing to the structure functions $g_1(x,Q^2)$ analytically in the whole kinematic region. The Wilson coefficient contains Kummer--elliptic integrals. We derive the representation ... More
Measurement of charged hadron production in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=8$ TeVApr 18 2019The production of charged hadrons within jets recoiling against a $Z$ boson is measured in proton-proton collision data at $\sqrt{s}=8$ TeV recorded by the LHCb experiment. The charged-hadron structure of the jet is studied longitudinally and transverse ... More
Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast})$ with a semileptonic tagging methodApr 18 2019We report a measurement of the ratios of branching fractions $\mathcal{R}(D) = {\cal B}(\bar{B} \to D \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B} \to D \ell^- \bar{\nu}_{\ell})$ and $\mathcal{R}(D^{\ast}) = {\cal B}(\bar{B} \to D^* \tau^- \bar{\nu}_{\tau})/{\cal ... More
Light-meson leptonic decay rates in lattice QCD+QEDApr 18 2019The leading electromagnetic (e.m.) and strong isospin-breaking corrections to the $\pi^+ \to \mu^+ \nu[\gamma]$ and $K^+ \to \mu^+ \nu[\gamma]$ leptonic decay rates are evaluated for the first time on the lattice. The results are obtained using gauge ... More
Emergence of hydrodynamical behavior in expanding quark-gluon plasmasApr 18 2019We use a set of simple angular moments to solve the Boltzmann equation in the relaxation time approximation for a boost invariant longitudinally expanding gluonic plasma. The transition from the free streaming regime at early time to the hydrodynamic ... More
Two-particle angular correlations in heavy ion collisions from a multiphase transport modelApr 18 2019We extend our earlier study on two-particle angular correlations in $pp$ collisions at low transverse momentum ($p_T$) to $p$-Pb, Pb-Pb and Au-Au collisions at RHIC and LHC energies. We mainly use the string melting version of a multiphase transport model ... More
The $φ(2170)$ production in the process $γp\to ηφp$Apr 18 2019We have studied the $\gamma p\to \eta \phi p$ reaction within the effective Lagrangian approach, by considering the contribution of the intermediate state $\phi(2170)$ production, and the background contributions of $t$-channel $\pi^0$ and $\eta$ mesons ... More
Portraying Double Higgs at the Large Hadron ColliderApr 18 2019We examine the discovery potential for double Higgs production at the high luminosity LHC in the final state with two $b$-tagged jets, two leptons and missing transverse momentum. Although this dilepton final state has been considered a difficult channel ... More
Discovering True Muonium at LHCbApr 17 2019We study the potential of the LHCb experiment to discover, for the first time, the $\mu^+\mu^-$ true muonium bound state. We propose a search for the vector $1^3S_1$ state, $\mathcal{T\!M}$, which kinetically mixes with the photon and dominantly decays ... More
The Effect of Hole Ice on the Propagation and Detection of Light in IceCubeApr 17 2019IceCube is a neutrino observatory at Earth's South Pole that uses glacial ice as detector medium. Secondary particles from neutrino interactions produce Cherenkov light, which is detected by an array of photo detectors deployed within the ice. In distinction ... More
Detection of Cosmic Rays from ground: an IntroductionApr 17 2019Cosmic rays are the most outstanding example of accelerated particles. They are about 1\% of the total mass of the Universe, so that cosmic rays would represent by far the most important energy transformation process of the Universe. Despite large progresses ... More
Hadron-Deuteron Correlations and Production of Light Nuclei in Relativistic Heavy-Ion CollisionsApr 17 2019Production of light nuclei in relativistic heavy-ion collisions is well described by both the thermal model, where light nuclei are in equilibrium with all other hadron species present in a fireball, and the coalescence model, where light nuclei are formed ... More
The $χ_{cJ}$ decay to $φK^* \bar K, φh_1(1380)$ testing the nature of axial vector meson resonancesApr 17 2019We perform a theoretical study of the $\chi_{cJ} \to \phi K^* \bar K \to \phi K\pi \bar K$ reaction taking into account the $K^* \bar K$ final state interaction, which in the chiral unitary approach is responsible, together with its coupled channels, ... More
Lepton flavour universality violation in semileptonic tree level weak transitionsApr 17 2019The recent deviations of the experimental data on some parameters of the semileptonic $B$ and $B_c$ mesons decays from the standard model (SM) predictions indicate considerable violations of the lepton universality and as a result, possible new physics ... More
NA61/SHINE results on Bose-Einstein correlationsApr 17 2019One of the main goals of NA61/SHINE is the investigation of the phase diagram of strongly interacting matter. NA61/SHINE observes collisions of various nuclei at different energies, allowing to study the same phenomena and observables in vastly different ... More
Electro-weak production of pseudovector C-even heavy quarkonia in electron-positron collisions on Belle II and BES IIIApr 17 2019It is shown that the molecular model for the X{3872) state contradicts the new experimental data as well as the old ones. It is suggested to study the \chi_{c1} and \chi_{b1} states in the e+e-\to\chi_{c1}/\chi_{b1} reactions.
A Multi-Layer SEU Mitigation Strategy to Improve FPGA Design Robustness for the ATLAS Muon Spectrometer UpgradeApr 16 2019We present a multi-layer single-event upset mitigation strategy implemented in a low-cost Xilinx Artix-7 FPGA. The implementation is targeted for a trigger data router for the ATLAS muon spectrometer upgrade. The mitigation strategy employs three layers ... More
Revisiting the $t\bar{t}hh$ channel at the FCC-hhApr 16 2019The exploration of the scalar sector of the Standard Model is at the core of current and future science programs at collider experiments, with increasing focus on the self-interaction of the Higgs boson. This important parameter of the Higgs sector can ... More
Perturbing neutrino oscillations around the solar resonanceApr 16 2019Atmospheric neutrinos at low energies, $E \lsim 500$ MeV, is known to be a rich source of information of lepton mixing parameters. We formulate a simple perturbative framework to elucidate the characteristic features of neutrino oscillation at around ... More
Measurement of Individual Antineutrino Spectra from $\mathbf{^{235}U}$ and $\mathbf{^{239}Pu}$ at Daya BayApr 16 2019This letter reports a new measurement of the prompt energy spectrum of reactor antineutrinos and the first measurement of individual spectra from $^{235}$U and $^{239}$Pu at Daya Bay. The analysis uses 3.5 million inverse beta decay (IBD) candidates in ... More
New Realization of the Conversion Calculation for Reactor Antineutrino FluxesApr 16 2019Validation of the effective conversion method in the reactor antineutrino flux calculation is examined using the ab initio calculation of the electron and antineutrino spectra from the state-of-the-art nuclear database. It turns out that neglecting the ... More
On solving the Thomas Bargman-Michel-Telegdi equation using the Bogoliubov Krylov method of averages and the calculation of the Berry phasesApr 16 2019Several proposals aimed at measuring the Electric Dipole Moment (EDM) for charged particles require very precise simulations and understanding of the systematic errors that can contribute to a spin buildup mimicking the EDM signal to be detected. In what ... More
Semileptonic decays $B_c \to (η_c,J/ψ) l \barν_l $ in the "PQCD + Lattice" approachApr 16 2019Apr 18 2019In this paper, we studied the semileptonic decays $B_c^- \to (\eta_c, J/\psi) l ^- \bar{\nu}_l$ by employing the PQCD factorization approach, using the newly defined distribution amplitudes of the $B_c$ meson and also taking into account the Lattice NRQCD ... More
Semileptonic decays $B_c \to (η_c,J/ψ) l \barν_l $ in the "PQCD + Lattice" approachApr 16 2019In this paper, we studied the semileptonic decays $B_c^- \to (\eta_c, J/\psi) l ^- \bar{\nu}_l$ by employing the PQCD factorization approach, using the newly defined distribution amplitudes of the $B_c$ meson and also taking into account the Lattice NRQCD ... More
On decays of $X(3872)$ to $χ_{cJ}π^0$ and $J/ψπ^+π^-$Apr 16 2019By describing the $X(3872)$ using the extended Friedrichs scheme, in which $D\bar D^*$ is the dominant component, we calculate the decay rates of the $X(3872)$ to $\pi^0$ and a $P$-wave charmonium $\chi_{cJ}$ state with $J=0,1$, or $2$, and its decays ... More
Minimal Dirac Neutrino Mass Models from $U(1)_R$ Gauge Symmetry and Left-Right Asymmetry at ColliderApr 16 2019Without imposing ad hoc discrete symmetries, we propose minimal realizations of generating Dirac neutrino masses in the context of a right-handed abelian gauge extension of the Standard Model. Utilizing only $U(1)_R$ symmetry, we address and analyze the ... More
Physics with Beam Tau-Neutrino Appearance at DUNEApr 15 2019We explore the capabilities of the upcoming Deep Underground Neutrino Experiment (DUNE) to measure $\nu_\tau$ charged-current interactions and the associated oscillation probability $P(\nu_\mu \to \nu_\tau)$ at its far detector, concentrating on how such ... More
Axion production and detection with superconducting RF cavitiesApr 15 2019We propose a novel design of a laboratory search for axions based on photon regeneration with superconducting RF cavities. Our particular setup uses a toroid as a region of confined static magnetic field, while production and detection cavities are positioned ... More
Analysis methods for highly radiation-damaged SiPMsApr 15 2019Prototype SiPMs with 4384 pixels of dimensions $15 \times 15~\mu $m$^2$ produced by KETEK have been irradiated with reactor neutrons to eight fluences between $10^9$ and $5\times 10^{14}$ cm$^{-2}$. For temperatures between $-30~^\circ $C and $+30~^\circ ... More
Search for $X(3872)$ and $X(3915)$ decay into $χ_{c1} π^0$ in $B$ decays at BelleApr 15 2019We report a search for $X(3872)$ and $X(3915)$ in $B^+ \to \chi_{c1} \pi^0 K^+$ decays. We set an upper limit of $\mathcal{B}(B^+ \to X(3872) K^+) \times \mathcal{B}(X(3872) \to \chi_{c1} \pi^0)$ $ < 8.1 \times 10^{-6}$ and $\mathcal{B}(B^+ \to X(3915) ... More
A search for solar axion induced signals with COSINE-100Apr 15 2019We present results from a search for solar axions with the COSINE-100 detector. We find no evidence of solar axion events from a data set of 6,303.9 kg$\cdot$days exposure and set a 90\,\% confidence level upper limit on the axion-electron coupling, $g_{ae}$, ... More
Measurement of branching fraction and final-state asymmetry for the $\bar{B}^{0}\to K^{0}_{S}K^{\mp}π^{\pm}$ decayApr 15 2019We report a measurement of the branching fraction and final-state asymmetry for the $\bar{B}^{0}\to K^{0}_{S}K^{\mp}\pi^{\pm}$ decays. The analysis is based on a data sample of 711 $\rm{fb}^{-1}$ collected at the $\Upsilon(4S)$ resonance with the Belle ... More
Improved Constraints on Sterile Neutrinos in the MeV to GeV Mass RangeApr 15 2019Improved upper bounds are presented on the coupling $|U_{e4}|^2$ of an electron to a sterile neutrino $\nu_4$ from analyses of data on nuclear and particle decays, including superallowed nuclear beta decays, the ratios $R^{(\pi)}_{e/\mu}=BR(\pi^+ \to ... More
The Tracking Machine Learning challenge : Accuracy phaseApr 14 2019This paper reports the results of an experiment in high energy physics: using the power of the crowd to solve difficult experimental problems linked to tracking accurately the trajectory of particles in the Large Hadron Collider (LHC). This experiment ... More
Dramatic implications of unitarity for meson spectroscopyApr 14 2019The most fundamental cornerstone of the PDG tables is the uniqueness of $S$-matrix pole positions of unstable particles, as a consequence of quantum-field-theory principles. Therefore, the unitarity property of the $S$-matrix should ideally be respected ... More
First observation of the radiative decay $Λ_{b}^{0} \to Λ γ$Apr 14 2019The radiative decay $\Lambda_{b}^{0} \to \Lambda \gamma$ is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of $1.7\,fb^{-1}$ collected by the LHCb experiment at a center-of-mass energy ... More
Neutrinoless double beta decay search with liquid scintillator experimentsApr 14 2019Liquid scintillator experiments for neutrinoless double beta decay search have high sensitivity based on the ultra low background environment and high scalability. This paper describes an overview of current ongoing projects KamLAND-Zen and SNO+.
Hydrodynamic flow in small systems, or: "How the heck is it possible that a system emitting only a dozen particles can be described by fluid dynamics?"Apr 13 2019The "unreasonable effectiveness" of relativistic fluid dynamics in describing high energy heavy-ion and even proton-proton collisions are demonstrated and discussed. Several recent ideas of optimizing relativistic fluid dynamics for the specific challenges ... More
Research and development in cylindrical triple-GEM detector with $μ$TPC readout for the BESIII experimentApr 13 2019The third generation of the Beijing Electron Spectrometer, BESIII, is an apparatus for high energy physics research. The hunting of new particles and the measurement of their properties or the research of rare processes are sought to understand if the ... More
The $W γ$ decay of the elusive charged Higgs boson in the two-Higgs-doublet model with vectorlike fermionsApr 13 2019The LHC search strategy for the charged Higgs boson $H^\pm$ in a two-Higgs-doublet model crucially depends on the top quark physics: for the low mass region, $H^\pm$ is mainly produced from the decay of a top quark; for the high mass region, $H^\pm$ decays ... More
Jet Structure Studies in Small SystemsApr 12 2019A study investigating a possible jet shape dependence on the charged event multiplicity is conducted on collision samples generated by Monte-Carlo (MC) event generators PYTHIA and HIJING++. We calculated the integral jet shape and found a significant ... More
Coherent J/$ψ$ photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}=5.02$ TeVApr 12 2019The coherent photoproduction of J/$\psi$ was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy $\sqrt{s_{\rm{NN}}}=5.02$ TeV with the ALICE detector. The J/$\psi$ is detected via its dimuon decay in the forward rapidity region for ... More
Diffuser Research and Development for Optical Calibration Systems in Hyper-KamiokandeApr 12 2019Proposed as part of the next generation of water Cherenkov detectors, Hyper-Kamiokande will have a vastly improved potential in determining leptonic CP violation in neutrino oscillations. Well understood optical diffusers are needed as part of an integrated ... More
Xenon TPCs for Double Beta Decay SearchesApr 12 2019Xenon time projection chambers (TPCs) have become a well-established detection technology for neutrinoless double beta decay searches in $^{136}$Xe. I discuss the motivations for this choice. I describe the status and prospects of both liquid and gaseous ... More
Heavy flavour measurements with the ALICE experiment at the LHCApr 12 2019Heavy quarks (charm and beauty) are produced early in the nucleus-nucleus collisions, and heavy flavor survives throughout the later stages. Measurements of heavy-flavor quarks thus provide us with means to understand the properties of the Quark-Gluon ... More
Commissioning and operation of the Cherenkov detector for proton Flux Measurement of the UA9 ExperimentApr 12 2019The UA9 Experiment at CERN-SPS investigates channeling processes in bent silicon crystals with the aim to manipulate hadron beams. Monitoring and characterization of channeled beams in the high energy accelerators environment ideally requires in-vacuum ... More
A fast and parametric digitization for triple-GEM detectorsApr 12 2019Triple-GEM detectors are a well known technology in high energy physics. In order to have a complete understanding of their behavior, in parallel with on beam testing, a Monte Carlo code has to be developed to simulate their response to the passage of ... More
Comment on the X(3915) nonstandard hadron candidateApr 12 2019I review the experimental evidence for the $X(3915)$, the candidate nonstandard meson associated with $\omega J\psi$ resonance-like peaks in $B\rightarrow K\omega J\psi$ and $\gamma\gamma\rightarrow\omega J\psi$ near $M(\omega J\psi)=3920$~MeV, and address ... More
$d^*(2380)$ and its partners in a diquark modelApr 12 2019The purpose of the present study was to explore the possibility of accommodating the $d^*(2380)$ and its flavor SU(3) partners in a diquark model. Proposing that $d^*(2380)$ is composed of three vector diquarks, its mass is calculated by use of an effective ... More
Ground-based Gamma-Ray Astronomy: an IntroductionApr 11 2019During the last two decades Gamma-Ray Astronomy has emerged as a powerful tool to study cosmic ray physics. In fact, photons are not deviated by galactic or extragalactic magnetic fields so their directions bring the information of the production sites ... More
Optimal Electromagnetic Searches for Axion and Hidden-Photon Dark MatterApr 11 2019Direct-detection searches for axions and hidden photons are playing an increasingly prominent role in the search for dark matter. In this work, we derive the properties of optimal electromagnetic searches for these candidates, subject to the Standard ... More
Evidence for the decay $B^0\to p\bar{p}π^0$Apr 11 2019We report a search for the charmless baryonic decay $B^0\to p\bar{p}\pi^0$ with a data sample corresponding to an integrated luminosity of 711~$\rm fb^{-1}$ containing $(772\pm 10)\times 10^6$ $B^0\bar{B}^0$ pairs. The data was collected by the Belle ... More
Final results on neutrino oscillation parameters from the OPERA experiment in the CNGS beamApr 11 2019The OPERA experiment has conclusively observed the appearance of tau neutrinos in the muon neutrino CNGS beam. Exploiting the OPERA detector capabilities, it was possible to isolate high purity samples of $\nu_{e}$, $\nu_{\mu}$ and $\nu_{\tau}$ charged ... More
Status and prospects of `bi-large' leptonic mixingApr 11 2019Bi-large patterns for the leptonic mixing matrix are confronted with current neutrino oscillation data. We analyse the status of these patterns and determine, through realistic simulations, the potential of upcoming long-baseline experiment DUNE in testing ... More
Measurement of the cross-section and charge asymmetry of $W$ bosons produced in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detectorApr 11 2019This paper presents measurements of the $W^+ \rightarrow \mu^+\nu$ and $W^- \rightarrow \mu^-\nu$ cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton--proton ... More
Several Problems in Particle Physics and Cosmology Solved in One SMASHApr 11 2019The Standard Model (SM) of particle physics is a big success. However, it lacks explanations for cosmic inflation, the matter-anti-matter asymmetry of the Universe, dark matter, neutrino oscillations, and the feebleness of CP violation in the strong interactions. ... More
Novel Resistive-Plate WELL sampling element for (S)DHCALApr 11 2019Digital and Semi-Digital Hadronic Calorimeters (S)DHCAL were suggested for future Colliders as part of the particle-flow concept. Though studied mostly with RPC-based techniques, investigations have shown that MPGD-based sampling elements could outperform. ... More
Interference effects in LNV and LFV semileptonic decays: the Majorana hypothesisApr 10 2019In the case where the Standard Model is extended by one heavy Majorana fermion, the branching fractions of semileptonic meson decays into same-sign and opposite-sign dileptons are expected to be of the same order. As we discuss here, this need not be ... More
A $\pmbν$ Solution to the Strong CP ProblemApr 10 2019We present a new solution to the strong CP problem in which the imaginary component of the up quark mass, $\mathcal{I}[m_u]$, acquires a tiny, but non-vanishing value. This is achieved via a Dirac seesaw mechanism, which is also responsible for the generation ... More
Measurement of $\mathrm{t\bar t}$ normalised multi-differential cross sections in pp collisions at $\sqrt s=13$ TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functionsApr 10 2019Normalised multi-differential cross sections for top quark pair ($\mathrm{t\overline{t}}$) production are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV using events containing two oppositely charged leptons. The analysed data ... More
The Pomeron, Odderon, and nucleon resonances in $φ$-meson photoproductionApr 10 2019We investigate the reaction mechanism of the $\phi$ photoproduction off the proton target, i.e., $\gamma p\to\phi p$, up to $\sqrt{s}=2.8$ GeV, reproducing various experimental data. For this purpose, we employ an effective Lagrangian approach by using ... More
Combination of searches for invisible Higgs boson decays with the ATLAS experimentApr 10 2019Dark matter particles, if sufficiently light, may be produced in decays of the Higgs boson. This Letter presents a statistical combination of searches for $H\to\textrm{invisible}$ decays where $H$ is produced according to the Standard Model via vector ... More
Reconstruction of $τ$ lepton pair invariant mass using an artificial neural networkApr 09 2019The reconstruction of the invariant mass of $\tau$ lepton pairs is important for analyses containing Higgs and Z bosons decaying to $\tau^{+}\tau^{-}$, but highly challenging due to the neutrinos from the $\tau$ lepton decays, which cannot be measured ... More
Fluctuations of anisotropic flow in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detectorApr 09 2019Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 $\mu$b$^{-1}$ of Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector at the LHC. These cumulants provide information ... More
Probing heavy neutrino mixing and associated CP violation at future hadron collidersApr 09 2019Heavy neutrinos are essential ingredients in the type-I seesaw mechanism for neutrino masses. Mixing and CP violation in the heavy neutrino sector therefore not only translate into neutrino oscillation parameters but also play an important role in generating ... More
SPD - the Spin Physics Project with Polarized Proton and Deuteron Beams at the NICA ColliderApr 09 2019The SPD experiment at the future NICA collider at JINR (Dubna, Russia) aims to investigate the nucleon spin structure and polarization phenomena in collisions of longitudinally and transversely polarized protons and deuterons at $\sqrt{s}$ up to 27 GeV ... More
Where are the Next Higgs Bosons?Apr 08 2019Simple symmetry arguments applied to the third generation lead to a prediction: there exist new sequential Higgs doublets with masses of order $\lesssim 5 $ TeV, with approximately universal Higgs-Yukawa coupling constants, $g\sim 1$. This is calibrated ... More
Where are the Next Higgs Bosons?Apr 08 2019Apr 16 2019Simple symmetry arguments applied to the third generation lead to a prediction: there exist new sequential Higgs doublets with masses of order $\lesssim 5 $ TeV, with approximately universal Higgs-Yukawa coupling constants, $g\sim 1$. This is calibrated ... More
Uncovering latent jet substructureApr 08 2019We apply techniques from Bayesian generative statistical modeling to uncover hidden features in jet substructure observables that discriminate between different a priori unknown underlying short distance physical processes in multi-jet events. In particular, ... More
Search for resonances decaying to a pair of Higgs bosons in the $\mathrm{b\overline{b}q\overline{q}'}\ellν$ final state in proton-proton collisions at $\sqrt{s}=$ 13 TeVApr 08 2019A search for new massive particles decaying into a pair of Higgs bosons in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. Data were collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 ... More
Lepton-flavor-violating semileptonic $τ$ decay and $K\toπν\barν$Apr 08 2019We consider lepton-flavor violation in strangeness changing ($|\Delta S|=1$) semileptonic $\tau$-lepton decays arising from new physics encoded in a standard model effective Lagrangian. Its invariance under the standard model gauge group entails the relevance ... More
Observation of a narrow pentaquark state, $P_c(4312)^+$, and of two-peak structure of the $P_c(4450)^+$Apr 08 2019A narrow pentaquark state, $P_c(4312)^+$, decaying to $J/\psi p$ is discovered with a statistical significance of $7.3\sigma$ in a data sample of ${\Lambda_b^0\to J/\psi p K^-}$ decays which is an order of magnitude larger than that previously analyzed ... More
Raman stimulated neutrino pair emissionApr 08 2019A new scheme using macroscopic coherence is proposed from a theoretical point to experimentally determine the neutrino mass matrix, in particular the absolute value of neutrino masses, and the mass type, Majorana or Dirac. The proposed process is a collective, ... More
Pulse-shape discrimination potential of new scintillator material: Ce:La-GPSApr 07 2019Ce:(Gd,La)$_2$Si$_2$O$_7$ (Ce:La-GPS) is a new scintillator material with high light output, high energy resolution, and fast decay time. Moreover, the scintillator has a high temperature ($\sim$150$^\circ$C) tolerance and is non-hygroscopic in nature; ... More
Charge asymmetry dependence of the elliptic flow splitting in relativistic heavy-ion collisionsApr 06 2019The elliptic flow splitting $\Delta v_2$ between $\bar{u}$ and $u$ quarks as well as between $\pi^-$ and $\pi^+$ in midcentral Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV has been studied, based on the framework of an extended multiphase transport model ... More
Charge asymmetry dependence of the elliptic flow splitting in relativistic heavy-ion collisionsApr 06 2019Apr 18 2019The elliptic flow splitting $\Delta v_2$ between $\bar{u}$ and $u$ quarks as well as between $\pi^-$ and $\pi^+$ in midcentral Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV has been studied, based on the framework of an extended multiphase transport model ... More
Observation of light-by-light scattering in ultraperipheral Pb+Pb collisions with the ATLAS detectorApr 06 2019This letter describes the observation of the light-by-light scattering process, $\gamma\gamma\rightarrow\gamma\gamma$, in Pb+Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated ... More
TURTLE: A C library for an optimistic stepping through a topographyApr 06 2019TURTLE is a C library providing utilities allowing to navigate through a topography described by a Digital Elevation Model (DEM). The library has been primarily designed for the Monte-Carlo transport of particles scattering over medium to long ranges, ... More
Search for Heavy Neutrinos in $π\to μν$ DecayApr 05 2019Heavy neutrinos were sought in pion decays $\pi^+ \rightarrow \mu^+ \nu$ by examining the observed muon energy spectrum for extra peaks in addition to the expected peak for a massless neutrino. No evidence for heavy neutrinos was observed. Upper limits ... More
Charm production in charged current deep inelastic scattering at HERAApr 05 2019Charm production in charged current deep inelastic scattering has been measured for the first time in $e^{\pm}p$ collisions, using data collected with the ZEUS detector at HERA, corresponding to an integrated luminosity of $358 pb^{-1}$. Results are presented ... More
Transition form factors: $γ^\ast + p \to Δ(1232)$, $Δ(1600)$Apr 05 2019Electroproduction form factors describing the $\gamma^\ast p \to \Delta^+(1232), \Delta^+(1600)$ transitions are computed using a fully-dynamical diquark-quark approximation to the Poincar\'e-covariant three-body bound-state problem in relativistic quantum ... More
Design of a high power production target for the Beam Dump Facility at CERNApr 05 2019The Beam Dump Facility (BDF) project is a proposed general-purpose facility at CERN, dedicated to beam dump and fixed target experiments. In its initial phase, the facility is foreseen to be exploited by the Search for Hidden Particles (SHiP) experiment. ... More
Recent results of the technological prototypes of the CALICE highly granular calorimetersApr 04 2019The CALICE Collaboration is conducting R\&D for highly granular calorimeters with an emphasis on detectors for Linear Colliders. This contribution briefly summarises recent tests of large scale technological prototypes of a silicon tungsten electromagnetic ... More
Tau decays and dark-sector searches at BaBarApr 04 2019We present some recent measurements performed using 514 fb-1 of $e^+e^-$ collisions collected with the BaBar detector at the PEP-II asymmetric collider at SLAC. First we present a study of the decay tau -> K K_S nu, we measure the branching fraction B(tau ... More
Discovery goals and opportunities in high energy physics: a defense of BSM-oriented exploration over signalismApr 04 2019Discoveries come through exclusions, confirmations or revolutionary findings with respect to a theory canon populated by the Standard Model (SM) and beyond the SM (BSM) theories. Guaranteed discoveries are accomplished only through pursuit of BSM exclusion/confirmation, ... More
Sub-GeV Atmospheric Neutrinos and CP-Violation in DUNEApr 04 2019We propose to use the unique event topology and reconstruction capabilities of liquid argon time projection chambers to study sub-GeV atmospheric neutrinos. The detection of low energy recoiled protons in DUNE allows for a determination of the leptonic ... More
Pion-photon transition form factor in QCD. Theoretical predictions and topology-based data analysisApr 04 2019Apr 05 2019We discuss the evaluation of the transition form factor (TFF) $F^{\gamma*\gamma\pi^0}(Q^2)$ by means of QCD theory and by state-space reconstruction from topological data analysis. We first calculate this quantity in terms of quark-gluon interactions ... More
Test of lepton flavor universality in ${B\to K^\ast\ell^+\ell^-}$ decays at BelleApr 04 2019Apr 05 2019We present a measurement of $R_{K^{\ast}}$, the ratio of the branching fractions ${\cal B}(B\to K^\ast \mu^+ \mu^-)$ and ${\cal B}(B\to K^\ast e^+ e^-)$, for both charged and neutral $B$ mesons. The ratio for charged $B$ mesons, $R_{K{^{\ast +}}}$, is ... More
Test of lepton flavor universality in ${B\to K^\ast\ell^+\ell^-}$ decays at BelleApr 04 2019We present a measurement of $R_{K^{\ast}}$, the ratio of the branching fractions ${\cal B}(B\to K^\ast \mu^+ \mu^-)$ and ${\cal B}(B\to K^\ast e^+ e^-)$, for both charged and neutral $B$ mesons. The ratio for charged $B$ mesons, $R_{K{^{\ast +}}}$, is ... More
Decay $X(3872)\toπ^0π^+π^-$ and $S$-wave $D^0\bar D^0 \toπ^+π^-$ scattering lengthApr 04 2019The isospin-breaking decay $X(3872)\to(D^*\bar D+ \bar D^*D) \to\pi^0D\bar D\to\pi^0\pi^+\pi^-$ is discussed. In its amplitude there is a triangle logarithmic singularity, due to which the dominant contribution to $BR(X(3872)\to\pi^0\pi^+\pi^-)$ comes ... More
Measurement of the Gamma Ray Background in the Davis Cavern at the Sanford Underground Research FacilityApr 03 2019Deep underground environments are ideal for low background searches due to the attenuation of cosmic rays by passage through the earth. However, they are affected by backgrounds from $\gamma$-rays emitted by $^{40}$K and the $^{238}$U and $^{232}$Th decay ... More
Short-baseline neutrino oscillations with 3+1 non-unitary mixingApr 03 2019We consider a scenario with unitary mixing of the three light standard neutrinos and a non-unitary mixing contribution of a heavier massive neutrino that can generate short-baseline neutrino oscillations. We show that this scenario predicts constant flavor-changing ... More