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Soft gluon effects on lepton pairs at hadron collidersApr 08 1997With a large integrated luminosity expected at the Tevatron, a next-to-leading order (NLO) calculation is no longer sufficient to describe the data which yield the precision measurement of $M_W$, etc. Thus, we extend the Collins-Soper-Sterman resummation ... More

Higgs Boson Production at Hadron Colliders with Soft Gluon Effects: I. BackgroundsOct 11 1998Feb 01 2005The gold-plated discovery mode of a Standard Model like Higgs boson at the CERN Large Hadron Collider (LHC) is the H -> Z^0 Z^0 decay mode. To find and then measure the properties of the Higgs, it is crucial to have the most precise theoretical prediction ... More

Testing Multiple Gluon Dynamics at the TevatronMar 25 1997We propose the measurement of the ratio $R_{CSS}(Q_T^{\min}) \equiv \frac{\sigma (Q_T>Q_T^{\min})}{\sigma _{Total}}$ to study the effects of the multiple soft gluon radiation, predicted by QCD, on the transverse momentum ($Q_T$) distribution of the weak ... More

Higgs Boson Production at the LHC with Soft Gluon EffectsJan 12 2000We present results of QCD corrections to Higgs boson production at the CERN Large Hadron Collider. Potentially large logarithmic contributions from multiple soft-gluon emission are summed up to all order in the strong coupling. Various kinematical distributions, ... More

Comment on the $W + 1$ jet to $W + 0$ jets ratioApr 29 1997To offer a possible resolution to the apparent discrepancy between the experimental and the theoretical values of the $W + 1$ jet to $W + 0$ jets ratio reported by the \D0 group, we examine the effects of the multiple soft gluon radiation on the $W$ boson ... More

Soft Gluon Resummation in Higgs Boson Plus Two Jet Production at the LHCFeb 08 2018In this paper, the soft gluon resummation effect in the Higgs boson plus two-jet production at the LHC is studied. By applying the transverse momentum dependent factorization formalism, the large logarithms introduced by the small total transverse momentum ... More

Soft Gluon Resummations in Dijet Azimuthal Angular Correlations at the ColliderMay 05 2014We derive all order soft gluon resummation in dijet azimuthal angular correlation in hadronic collisions at the next-to-leading logarithmic level. The relevant coefficients for the Sudakov resummation factor, the soft and hard factors, are calculated. ... More

Transverse Momentum Resummation for Dijet Correlation in Hadronic CollisionsJun 19 2015We study the transverse momentum resummation for dijet correlation in hadron collisions based on the Collins-Soper-Sterman formalism. The complete one-loop calculations are carried out in the collinear factorization framework for the differential cross ... More

Heavy Quarkonium Production at Low Pt in NRQCD with Soft Gluon ResummationOct 12 2012Apr 16 2013We extend the non-relativistic QCD (NRQCD) prediction for the production of heavy quarkonium with low transverse momentum in hadronic collisions by taking into account effects from all order soft gluon resummation. Following the Collins-Soper-Sterman ... More

Kinematical correlations for Higgs boson plus High Pt Jet Production at Hadron CollidersSep 14 2014We investigate the effect of QCD resummation to kinematical correlations in the Higgs boson plus high transverse momentum (Pt) jet events produced at hadron colliders. We show that at the complete one-loop order, the Collins-Soper-Sterman resummation ... More

Long Range Correlation in Higgs Boson Plus Two Jets Production at the LHCApr 30 2016We study Higgs boson plus two high energy jets production at the LHC in the kinematics where the two jets are well separated in rapidity. The partonic processes are dominated by the t-channel weak boson fusion (WBF) and gluon fusion (GF) contributions. ... More

Detecting a Light Stop from Top Decays at the TevatronSep 29 1995We study the possibility of discovering or excluding a light top squark (stop) based on top quark decays in the t-tbar events produced at the Fermilab Tevatron. In particular, we consider the Minimal Supersymmetric Standard Model with the sparticle spectrum ... More

Effects of QCD Resummation on $W^+h$ and $t\bar b$ Production at the TevatronMar 04 1997The resummation of multiple soft gluon emission affects the production rate and kinematic distributions of $W^+h$ (where h is a Higgs boson) and $t \bar b$ pairs at the Tevatron with $\sqrt{s}=2$ TeV. Using the Collins-Soper-Sterman resummation formalism, ... More

Effects of QCD Resummation on Distributions of Top--Antitop Quark Pairs Produced at the TevatronJun 18 1996We study the kinematic distributions of top--antitop quark pairs produced at the Tevatron, including the effects of initial state and final state multiple soft gluon emission, using the Collins--Soper--Sterman resummation formalism. The resummed results ... More

Testing Supersymmetry in the Associated Production of CP-odd and Charged Higgs BosonsDec 12 2001In the Minimal Supersymmetric Standard Model (MSSM), the masses of the charged Higgs boson ($H^\pm$) and the CP-odd scalar ($A$) are related by $M_{H^+}^2=M_A^2+m_W^2$. Furthermore, because the coupling of $W^-$-$A$-$H^+$ is fixed by gauge interaction, ... More

The Phenomenology of Single Top Quark Production at the Fermilab TevatronOct 16 1997Single top quark production at the Fermilab Tevatron Run II (a p \bar{p} collider with \sqrt{S} = 2 TeV) proceeds dominantly via two sub-processes, a t-channel W-gluon fusion process, and an s-channel W^* process. We show that these two sub-processes ... More

Anomalous t-c-g coupling: The connection between single top production and top decayNov 05 1996Continuing earlier work, we examine the constraint on an anomalous t-c-g coupling from top quark decay. We find that from current CDF measurements of the branching ratio $t \rightarrow W b$, the minimum scale at which new physics can strongly modify the ... More

Top Quark Interactions and the Search for New PhysicsJun 20 1996Feb 02 1997We give a complete set of 19 independent effective dimension 5 interactions involving the top and bottom quarks with the electroweak gauge bosons within the context of the chiral Lagrangian. The anomalous operators contribute to the leading energy power ... More

High-p_T Higgs Boson Production at Hadron Colliders to Order(alpha_s G_Fermi^3)Jul 05 1995We study high--$p_T$ Higgs boson production at hadron colliders to order($\alpha_s$ $G_F^3$) in hadron collisions. In particular, we investigate the process $g+q/\bar{q}\ra q/\bar{q}+H$, where $q=u,d,c,s,$ or $b$, for the LHC (a $\sqrt{s}=$14~TeV, proton--proton ... More

Lone Higgs at the LHCJun 16 2008Sep 19 2008We address the possible scenario that the Large Hadron Collider (LHC) discovers only a Higgs boson after 10 fb^{-1} of operation, and attempt to identify this Higgs boson as that of the Standard Model (SM), the minimal universal extra dimension model ... More

Single-spin asymmetries with weak bosons at RHICApr 01 2003In order to measure spin-dependent parton distributions in production of weak bosons using the non-hermetic detectors of the Relativistic Heavy Ion Collider, an accurate model for distributions of charged leptons from the W boson decay is needed. We discuss ... More

Single Top Production as a Window to Physics Beyond the Standard ModelJul 26 2000Oct 17 2000Production of single top quarks at a high energy hadron collider is studied as a means to identify physics beyond the standard model related to the electroweak symmetry breaking. The sensitivity of the $s$-channel $W^*$ mode, the $t$-channel $W$-gluon ... More

Resummation for single-spin asymmetries in W boson productionOct 12 2002To measure spin-dependent parton distribution functions in the production of W bosons at the Relativistic Heavy Ion Collider, an accurate model for distributions of charged leptons from the W boson decay is needed. We present single-spin lepton-level ... More

Soft parton radiation in polarized vector boson production: theoretical issuesApr 01 2003Jun 26 2003Accurate measurement of spin-dependent parton distributions in production of electroweak bosons with polarized proton beams at the Relativistic Heavy Ion Collider depends on good understanding of QCD radiation at small transverse momenta $q_T$ of vector ... More

Diphoton Background to Higgs Boson Production at the LHC with Soft Gluon EffectsMay 31 1999Apr 27 2000The detection and the measurement of the production cross section of a light Higgs boson at the CERN Large Hadron Collider demand the accurate prediction of the background distributions of photon pairs. To improve this theoretical prediction, we present ... More

Resummation of High Order Corrections in $Z$ Boson Plus Jet Production at the LHCOct 09 2018Apr 30 2019We study the multiple soft gluon radiation effects in $Z$ boson plus jet production at the LHC. By applying the transverse momentum dependent factorization formalism, the large logarithms introduced by the small total transverse momentum of the $Z$ boson ... More

Resummation of High Order Corrections in Higgs Boson Plus Jet Production at the LHCFeb 25 2016We study the effect of multiple parton radiation to Higgs boson plus jet production at the LHC, by applying the transverse momentum dependent (TMD) factorization formalism to resum large logarithmic contributions to all orders in the expansion of the ... More

Resummation of High Order Corrections in $Z$ Boson Plus Jet Production at the LHCOct 09 2018We study the multiple soft gluon radiation effects in $Z$ boson plus jet production at the LHC. By applying the transverse momentum dependent factorization formalism, the large logarithms introduced by the small total transverse momentum of the $Z$ boson ... More

Universal Non-perturbative Functions for SIDIS and Drell-Yan ProcessesJun 11 2014Mar 20 2015We update the well-known BLNY fit to the low transverse momentum Drell-Yan lepton pair productions in hadronic collisions, by considering the constraints from the semi-inclusive hadron production in deep inelastic scattering (SIDIS) from HERMES and COMPASS ... More

Inelastic Channels in WW ScatteringFeb 05 1993If the electroweak symmetry-breaking sector becomes strongly interacting at high energies, it can be probed through longitudinal $W$ scattering. We present a model with many inelastic channels in the $W_L W_L$ scattering process, corresponding to the ... More

Studying the Top Quark via the W-Gluon Fusion ProcessNov 20 1992Mar 01 1993We show that studying the single top quark production via the $W$--gluon fusion process can provide unique information on: (i) the measurement of the decay width $\width$; (ii) probing the symmetry breaking mechanism by measuring the form factor of~\tbW; ... More

Probing the Electroweak Symmetry Breaking Sector with the Top QuarkSep 25 1996Dec 10 1996A study on effective anomalous interactions up to dimension 5 of the top quark with the electroweak gauge bosons is made in the non-linear Chiral Lagrangian approach. Bounds on the anomalous dimension four terms are obtained from their contribution to ... More

Updating and Optimizing Error PDFs in the Hessian ApproachJun 20 2018Nov 01 2018We discuss how to apply the Hessian method (i) to predict the impact of a new data set (or sets) on the parton distribution functions (PDFs) and their errors, by producing an updated best-fit PDF and error PDF sets, such as the CTEQ-TEA PDFs; (ii) to ... More

Combined Effect of QCD Resummation and QED Radiative Correction to W boson Observables at the LHCJan 22 2004A precise determination of the $W$ boson mass at the CERN LHC requires a theoretical calculation in which the effect of the initial-state multiple soft-gluon emission and the final-state photonic correction are simultaneously included. Here, we present ... More

Transverse Momentum Resummation for $s$-channel single top quark production at the LHCNov 04 2018Feb 15 2019We study the soft gluon radiation effects for the $s$-channel single top quark production at the LHC. By applying the transverse momentum dependent factorization formalism, the large logarithms about the small total transverse momentum ($q_\perp$) of ... More

Effects of QCD Resummation on Distributions of Leptons from the Decay of Electroweak Vector BosonsMay 01 1995May 02 1995We study the distributions of leptons from the decay of electroweak vector bosons produced in hadron collisions. The effects of the initial state multiple soft-gluon emission, using the Collins--Soper resummation formalism, are included. The resummed ... More

Combined Effect of QCD Resummation and QED Radiative Correction to W boson Observables at the TevatronJan 06 2004A precise determination of the W boson mass at the Fermilab Tevatron requires a theoretical calculation in which the effects of the initial-state multiple soft-gluon emission and the final-state photonic correction are simultaneously included . Here, ... More

Can the Electroweak Symmetry-breaking Sector Be Hidden?Jun 26 1992In a recent paper, Chivukula and Golden claimed that the electroweak symmetry--breaking sector could be hidden if there were many inelastic channels in the longitudinal $WW$ scattering process. They presented a model in which the $W$'s couple to pseudo--Goldstone ... More

Single Top Quark Production and Decay at Next-to-leading Order in Hadron CollisionAug 16 2004Feb 23 2005We present a calculation of the next-to-leading order QCD corrections, with one-scale phase space slicing method, to single top quark production and decay process $p\bar{p},pp\to t\bar{b}+X\to b\ell\nu\bar{b}+X$ at hadron colliders. Using the helicity ... More

The Nonperturbative Regime in QCD Resummation for Gauge Boson Production at Hadron CollidersNov 23 1993Nov 30 1994We study the nonperturbative functions in the Collins--Soper--Sterman resummation formalism by examing Drell--Yan data in both fixed target and collider experiments and then predict the transverse momentum distributions of the $W^\pm$ and $Z^0$ bosons ... More

A Probe of New Physics in Top Quark Pair Production at $e^-e^+$ CollidersNov 18 1992Dec 03 1993We describe how to probe new physics through examination of the form factors describing the Ztt couplings via the scattering process e^-e^+->t+tbar. We focus on experimental methods on how the top quark momentum can be determined and show how this can ... More

Probing the Electroweak Symmetry Breaking Sector with the Top QuarkApr 10 1997A study on the effective anomalous interactions, up to dimension 5, of the top quark with the electroweak gauge bosons is made in the non-linear Chiral Lagrangian approach. Bounds on the anomalous dimension four terms are obtained from their contribution ... More

A Model of Strong Flavor Dynamics for the Top QuarkMar 19 1996We discuss a model in which the third generation fermions undergo a different $SU(2)$ weak interaction from the first two generation fermions. In general, a flavor changing neutral current interaction is expected. Constrained by the precision low energy ... More

Inelastic Channels in the Electroweak Symmetry-Breaking SectorJun 25 1992It has been argued that if light Higgs bosons do not exist then the self--interactions of $W$'s become strong in the TeV region and can be observed in longitudinal $WW$ scattering. We present a model with many inelastic channels in the $WW$ scattering ... More

Probing New Physics from the Single-Top ProductionSep 02 1995We show that the production rate of the single-top quark event from the $W$-gluon fusion process is sensitive to new physics which strongly modifies the interactions of the top quark. The measurement of its production rate gives the partial decay width ... More

Probing Form Factors in Top Quark Pair Production at $e^-e^+$ CollidersJul 15 1993We describe how to probe new physics through large CP violation effects and non--standard Z-t-t couplings via the scattering process e^-e^+ -> t tbar. [Talk presented at the Workshop on Physics and Experiments with Linear $e^+e^-$ Colliders, Waikoloa, ... More

Anomalous W^+ W^- t {\bar t} Couplings at the e^+ e^- Linear ColliderSep 11 1997We study production of t {\bar t} via W^+ W^- fusion, including the relevant backgrounds at the proposed Linear Collider (an e^+ e^- collider with \sqrt{S} = 1.5 TeV) in the context of a Higssless Standard Model (SM), i.e. a nonlinear SU(2)_L \times U(1)_Y ... More

New Method for Detecting Charged (Pseudo-)Scalars at CollidersOct 15 1998May 07 1999We propose a new method for detecting a charged (pseudo-)scalar at colliders, based upon the observation that its Yukawa coupling to charm and bottom quarks can be large due to a significant mixing of the top and charm quarks. After analyzing the typical ... More

Gluon-gluon contributions to the production of continuum diphoton pairs at hadron collidersFeb 01 2007Jul 24 2007We compute the contributions to continuum photon pair production at hadron colliders from processes initiated by gluon-gluon and gluon-quark scattering into two photons through a four-leg virtual quark loop. Complete two-loop cross sections in perturbative ... More

Soft and collinear parton radiation in heavy quark productionJul 29 2002When the energy of the heavy quark is comparable with its mass, it is natural to attribute this heavy quark to the hard part of the reaction. At large energies, this approach is impractical due to large logarithms from intensive QCD radiation affecting ... More

Azimuthal asymmetries at HERA: theoretical aspectsDec 20 2000Aug 10 2001We comment on theoretical aspects of the measurement of azimuthal asymmetries in semi-inclusive charged particle production, made recently by the ZEUS Collaboration at HERA. By taking the ratio of the two measured asymmetries, we find good agreement between ... More

Tevatron Run-1 Z Boson Data and Collins-Soper-Sterman Resummation FormalismDec 11 2002Apr 25 2003We examine the effect of the Z-boson transverse momentum distribution measured at the Run-1 of the Tevatron on the nonperturbative function of the Collins-Soper-Sterman (CSS) formalism, which resums large logarithmic terms from multiple soft gluon emission ... More

The Search for Anomalous W^+ W^- t \bar{t} Couplings at the LCJan 22 2001We study production of t \bar{t} via W^+ W^--fusion, including the relevant backgrounds at the proposed Linear Collider (an e^+ e^- collider with \sqrt{S} = 1.5 TeV) in the context of a Higssless Standard Model (HSM), i.e. a nonlinear SU(2)_L \times U(1)_Y ... More

New Topflavor Models with Seesaw MechanismNov 08 1999Apr 10 2000New class of models are constructed in which the third family quarks, but not leptons, experience a new SU(2) or U(1) gauge force. Anomaly cancellation enforces the introduction of spectator quarks so that the top and bottom masses are naturally generated ... More

Global Analysis for Probing Electroweak Symmetry Breaking Mechanism at High Energy CollidersApr 09 1997We review our recent global analysis for probing the electroweak symmetry breaking (EWSB) mechanism by the universal effective Lagrangian description. After summarizing and commenting upon the current bounds for the EWSB parameters, we focus on testing ... More

Probing Electroweak Symmetry Breaking via WW Interactions at High Energy CollidersAug 19 1997We classify the sensitivities of the future high energy hadron and electron colliders, such as the LHC and the future Linear Colliders, to probing all the next-to-leading order (NLO) bosonic operators for studying the electroweak symmetry breaking (EWSB) ... More

Phenomenology of multiple parton radiation in semi-inclusive deep-inelastic scatteringDec 20 2000In the current region of semi-inclusive deep-inelastic scattering, most events are accompanied by intensive radiation of soft and collinear partons which cannot be reliably described at any fixed order of perturbative QCD. In this paper, a resummation ... More

Soft parton resummation in the current region of semi-inclusive deep inelastic scatteringJun 15 2000We discuss resummation of large logarithmic terms that appear in the cross-section of semi-inclusive DIS in the case when the final-state hadron follows the direction of the incoming electroweak vector boson in the c.m. frame of the vector boson and the ... More

Semi-Inclusive Hadron Production at HERA: the Effect of QCD Gluon ResummationJun 07 1999Jun 18 1999We present a formalism that improves the applicability of perturbative QCD in the current region of semi-inclusive deep inelastic scattering. The formalism is based on all-order resummation of large logarithms arising in the perturbative treatment of ... More

Global Power Counting Analysis On Probing Electroweak Symmetry Breaking Mechanism At High Energy CollidersApr 14 1996Nov 06 1996We develop a precise power counting rule (a generalization of Weinberg's counting method for the nonlinear sigma model) for the electroweak theories formulated by chiral Lagrangians. Then we estimate the contributions of ``all'' next-to-leading order ... More

Estimating The Sensitivity Of The LHC To Electroweak Symmetry Breaking: Longitudinal-Goldstone Boson Equivalence As A CriterionNov 13 1996Based upon our recent study, we reveal the profound physical content of the longitudinal-Goldstone boson equivalence theorem as being able to discriminate physical processes which are sensitive/insensitive to probing the electroweak symmetry breaking ... More

Photon Pair Production with Soft Gluon Resummation in Hadronic InteractionsDec 21 1997The production rate and kinematic distributions of isolated photon pairs produced in hadron interactions are studied. The effects of the initial-state multiple soft-gluon emission to the scattering subprocesses q-qbar, qg, and gg to gamma gamma X are ... More

Leading Electroweak Corrections to the Production of Heavy Top Quarks at Hadron CollidersMay 14 1993We calculate the electroweak corrections of the order $O({m_t^2\over v^2})$ to the QCD production of $t\bar{t}$ pairs via $q+qbar->t+tbar$ at hadron colliders and show that these corrections to the total production rate are small. This correction can ... More

New Production Mechanism of Neutral Higgs Bosons with Right scalar tau neutrino as the LSPJun 28 2000Jul 04 2000Motived by the neutrino oscillation data, we consider the lightest tau sneutrino $\tilde \nu_{\tau_1}$ (which is mostly the right tau sneutrino) to be the lightest supersymmetric particle (LSP) in the framework of the minimal supersymmetric Standard Model. ... More

Resummation for the Tevatron and LHC boson production at small xJan 19 2004Analysis of small-x semi-inclusive DIS hadroproduction suggests that multiple parton radiation leads to a broadening of transverse momentum distributions beyond that predicted by a straightforward calculation in the Collins-Soper-Sterman formalism. This ... More

Probing Electroweak Symmetry Breaking Mechanism at the LHC: A Guideline from Power Counting AnalysisSep 12 1995Dec 24 1996We formulate the equivalence theorem as a theoretical criterion for sensitively probing the electroweak symmetry breaking mechanism, and develop a precise power counting method for the chiral Lagrangian formulated electroweak theories. Armed with these, ... More

Equivalence Theorem as a Criterion for Probing the Electroweak Symmetry Breaking MechanismMar 17 1995Aug 28 1995Based upon our recent study on the Lorentz non-invariance ambiguity in the longitudinal weak-boson scatterings and the precise conditions for the validity of the Equivalence Theorem (ET), we further examine the intrinsic connection between the longitudinal ... More

Transverse momentum resummation for Higgs boson produced via bb-bar fusion at hadron collidersSep 11 2005We study the impact of initial-state multiple parton radiation on transverse momentum $(q_T)$ distribution of Higgs boson produced via bottom quark fusion at hadron colliders. The shape of the resulting $q_T$ distribution is affected by the bottom-quark ... More

Study of the Rho-pi Puzzle in Charmonium DecaysNov 16 2006Jul 02 2007The theoretical explanations about the ``Rho-pi puzzle'' in charmonium decays are reviewed extensively, and the comparison of theoretical predications with experimental data is made whenever possible. Three methods to estimate the ratio of the branching ... More

Measurement of the exclusive light hadron decays of the psi'' in e+e- experimentsDec 26 2005The measurement of the exclusive light hadron decays of the psi'' in e+e- experiments with significant interference between the psi'' and non-resonance continuum amplitudes is discussed. The radiative correction and the Monte Carlo simulation are studied. ... More

Possible large branching fraction of psi(3770) decays to charmless final statesOct 22 2004The branching fraction of the psi(3770) decays into charmless final states is estimated in the S- and D-wave charmonia mixing scheme. With the information of the hadronic decays of J/psi and psi(3686), it is found that a large branching fraction, up to ... More

Measuring psi(3770) -> Kshort Klong as a test of the S- and D-wave mixing of charmoniaFeb 22 2004Oct 22 2004Adding to the long standing "rho-pi puzzle" in psi(3686) and J/psi decays, recently BES reported the branching ratio of psi(3686) -> Kshort Klong which is enhanced relative to the pQCD " 12% rule" expectation from the branching ratio of J/psi -> Kshort ... More

Transverse momentum resummation at small x for the Tevatron and LHCOct 27 2004Jul 14 2005Analysis of semi-inclusive DIS hadroproduction suggests broadening of transverse momentum distributions at $x$ below a few $10^{-3}$, which can be modeled in the Collins-Soper-Sterman formalism by a modification of impact-parameter-dependent parton densities. ... More

Next-to-leading order QCD corrections to s-channel single top quark production and decay at the LHCNov 03 2009Feb 09 2010We present a study of electroweak production of top and antitop quarks in the s-channel mode at the LHC, including next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to the production and decay of the single (anti)top quark. The spin ... More

Collider Signature of Bulk Neutrinos in Large Extra DimensionsMay 23 2004Oct 13 2004We consider the collider signature of right-handed neutrinos propagating in $\delta$ (large) extra dimensions, and interacting with Standard Model fields only through a Yukawa coupling to the left-handed neutrino and the Higgs boson. These theories are ... More

Search for New Physics via Single Top Production at the LHCApr 21 2007Nov 16 2007We consider single-top production as a probe for new physics effects at the Large Hadron Collider (LHC). We argue that for natural theories a small deviation from the Standard Model tree-level couplings in this reaction can be parameterized by 3 higher ... More

Associated Production of CP-odd and Charged Higgs Bosons at Hadron CollidersNov 06 2003Jan 09 2004In the Minimal Supersymmetric Standard Model, the masses of the charged Higgs boson ($H^\pm$) and the CP-odd scalar ($A$) are related by $M_{H^+}^2=M_A^2+m_W^2$ at the Born level. Because the coupling of $W^-$-$A$-$H^+$ is fixed by gauge interaction, ... More

Single Charged Higgs Boson Production in Polarized Photon Collision and the Probe of New PhysicsSep 30 2002Aug 25 2003We study single charged Higgs boson production in photon-photon collision as a probe of the new dynamics of Higgs interactions. This is particularly important when the mass ($M_{H^\pm}$) of charged Higgs bosons ($H^{\pm}$) is relatively heavy and above ... More

Quartic Gauge Boson Couplings at Linear Colliders ---Interplay of WWZ/ZZZ Production and WW-Fusion--Nov 24 1997Jan 13 1998We study new physics effects to the quartic gauge boson couplings formulated by the electroweak chiral Lagrangian. Five next-to-leading order operators characterize the anomalous quartic gauge interactions which involve pure Goldstone boson dynamics for ... More

Sensitivity of the LHC to Electroweak Symmetry Breaking: Equivalence Theorem as a CriterionAug 14 1995Aug 15 1995Based upon our recent study on the intrinsic connection between the longitudinal weak-boson scatterings and probing the electroweak symmetry breaking (EWSB) mechanism, we reveal the profound physical content of the Equivalence Theorem (ET) as being able ... More

Resolving the degeneracy in top quark Yukawa coupling with Higgs pair productionApr 26 2019The top quark Yukawa coupling ($y_t$) can be modified by two dimension-six operators $\mathcal{O}_H$ and $\mathcal{O}_y$ with the corresponding Wilson coefficients $c_H$ and $c_y$, whose individual contribution cannot be distinguished by measuring $y_t$ ... More

Update on very light CP-odd scalar in the Two-Higgs-Doublet ModelMay 18 2002Aug 15 2002In a previous work we have shown that a general two-Higgs-doublet model (THDM) with a very light CP-odd scalar can be compatible with electroweak precision data, such as the rho parameter, BR(b --> s gamma), R_b, A_b, BR(Upsilon --> A gamma), BR(eta --> ... More

Uncertainties of the Inclusive Higgs Production Cross Section at the Tevatron and the LHCAug 20 2005We study uncertainties of the predicted inclusive Higgs production cross section due to the uncertainties of parton distribution functions (PDF). Particular attention is given to bbH Yukawa coupling enhanced production mechanisms in beyond SM scenarios, ... More

Measuring psi(3770) --> rho pi in e+e- experimentAug 05 2003Oct 22 2003In S- and D-wave mixing scheme, the branching ratio of psi(3770) --> rho pi is estimated. Together with the continuum cross section of rho pi estimated by form factor, the observed cross section of rho pi production at psi(3770) in e+e- experiment is ... More

On the leptonic partial widths of the excited psi statesJul 01 2010The resonance parameters of the excited psi-family resonances, namely the psi(4040), psi(4160), and psi(4415), were determined by fitting the R-values measured by experiments. It is found that the previously reported leptonic partial widths of these states ... More

The Form Factors of omega pi0 and pi+ pi- at psi(2S)Dec 04 2002Mar 17 2003The measurements of psi(2S) -> omega pi0 and psi(2S) -> pi+ pi- in e+e- experiments are examined. It is found that the non-resonance virtual photon annihilation gives large contributions to the observed cross sections of these two processes. By including ... More

Global Analysis of General SU(2) x SU(2) x U(1) Models with Precision DataMar 17 2010We present the results of a global analysis of a class of models with an extended electroweak gauge group of the form SU(2) x SU(2) x U(1), often denoted as G(221) models, which include as examples the left-right, the lepto-phobic, the hadro-phobic, the ... More

Single top quark production and decay in the t-channel at next-to-leading order at the LHCDec 23 2010We present a study of single top and single antitop quark production in the t-channel mode at the LHC pp collider at 7 TeV, 10 TeV and 14 TeV, including next-to-leading order QCD corrections to the production and decay of the top quark. We discuss the ... More

Constraints on Large Extra Dimensions with Bulk NeutrinosDec 24 2003Mar 22 2004We consider right-handed neutrinos propagating in $\delta$ (large) extra dimensions, whose only coupling to Standard Model fields is the Yukawa coupling to the left-handed neutrino and the Higgs boson. These theories are attractive as they can explain ... More

Next-to-Leading Order Corrections to Single Top Quark Production and Decay at the Tevatron: 1. s-channel ProcessSep 03 2004Feb 23 2005We present a study of s-channel single top quark production at the upgraded Tevatron $p\bar{p}$ collider, including the next-to-leading order (NLO) QCD corrections to the production and the decay of the top quark. The "modified" narrow width approximation ... More

Extended X-ray emission in the high redshift quasar GB 1508+5714 at z=4.3Sep 11 2003Sep 23 2003We report the discovery of extended X-ray emission around the powerful high-redshift quasar GB 1508+5714 at z=4.3, revealed in a long Chandra ACIS observation. The emission feature is 3-4 arcsec away from the quasar core, which corresponds to a projected ... More

QCD Corrections to Scalar Production via Heavy Quark Fusion at Hadron CollidersDec 06 1998Sep 01 1999We recently proposed that, due to the top-quark-mass enhanced Yukawa coupling, the s-channel production of a charged scalar or pseudo-scalar from heavy quark fusion can be an important new mechanism for discovering non-standard spin-0 particles. In this ... More

Longitudinal/Goldstone boson equivalence and phenomenology of probing the electroweak symmetry breakingJul 28 1995Aug 13 1995We formulate the equivalence between the longitudinal weak-boson and the Goldstone boson as a criterion for sensitively probing the electroweak symmetry breaking mechanism and develop a precise power counting rule for chiral Lagrangian formulated electroweak ... More

Supersymmetric QCD Parity Nonconservation in Top Quark Pairs at the TevatronSep 08 1997Feb 12 1998In the supersymmetry (SUSY) models, because of the mass difference between the left- and right-top squarks, the supersymmetric QCD interactions can generate parity violating effects in the production of $ t \bar t$ pairs. We show that SUSY QCD radiative ... More

Branching fraction of the isospin violating process phi to omega pi0Sep 01 2010We examine the parametrization of the e+e- -> omega pi0 cross section in the vicinity of the phi resonance and the extraction of the branching fraction of the isospin violating process phi -> omega pi0 from experimental data. We found that there are two ... More

The Y(4260) as an omega chi_{c1} molecular stateNov 09 2005Feb 22 2006It is suggested that the newly observed Y(4260) by BARBAR collaboration is a molecular state composed of an omega and a chi_{c1}. Both the production and decay properties are discussed. A consequence for this molecular state, Y(4260), is that it decays ... More

Analysis of tbW and ttZ couplings from CLEO and LEP/SLC dataMar 18 1999We update the constraints on anomalous dimension four $\tbw$ and $\ttz$ couplings by using CLEO $b \ra s \gamma$ and LEP/SLC precision $Z$-pole data. It is found that the data imposes very stringent bounds on them. Moreover, the $2 \sigma$ pull from SM ... More

Axigluons cannot explain the observed top quark forward-backward asymmetryJul 01 2010Sep 30 2010We study an SU(3)^2 axigluon model introduced by Frampton, Shu, and Wang to explain the recent Fermilab Tevatron observation of a significant positive enhancement in the top quark forward-backward asymmetry relative to standard model predictions. First, ... More

Phenomenology of Littlest Higgs Model with T-parity: including effects of T-odd fermionsSep 19 2006Jan 17 2007We study the collider phenomenology of a Littlest Higgs model with T-parity. We first stress the important role of the T-odd SU(2) doublet fermions (introduced to make the model T-parity invariant) in high energy scattering processes, such as $q\bar{q}\to ... More

Very light CP-odd scalar in the Two-Higgs-Doublet ModelMar 27 2001May 15 2001We show that a general two-Higgs-doublet model (THDM) with a very light CP-odd scalar (A) can be compatible with the rho parameter, Br(b --> s\gamma), R_b, A_b, (g-2) of muon, Br(Upsilon --> A gamma), and the direct search via the Yukawa process at LEP. ... More