Dilepton Emission at Temperature Dependent Baryonic Quark-Gluon Plasma

Dilepton emission is calculated from quark-gluon plasma (QGP) with the consideration of temperature dependent chemical potential (TDCP). The model is considered to be quasi-model and hence take the dynamical quark mass as a finite value dependence on temperature. The temperature in quark mass enhances in the growth of dilepton emission rates. The emission rate of dilepton spectrum is shown in the intermediate mass region (IMR) of 1.0 - 4.0 GeV and its rate is observed to be a strong increasing function of the temperature dependent chemical potential for quark and anti-quark annihilation.

Search for an exotic vectorlike X-quark in same-sign dilepton final states at the future 3 TeV CLIC

Vectorlike quarks(VLQs)with masses at the TeV-scale have been predicted in many new physics scenarios beyond the Standard Model(SM).Based on a simplified(X,T)doublet model including the exotic vectorlike X quark(VLQ-X)with an electric charge 5/3,we study the production of the VLQ-X decaying into tW at the future Compact Linear Collider(CLIC)with √s=3 TeV including the initial state radiation and beamstrahlung effects.We focus on the final signals,including same-sign dileptons(electrons or muons),at least one b-tagged jet,and large missing transverse momentum.By performing detailed signal-to-background analyses and detector simulations,we obtain the 2σexclusion capabilities and discovery reaches,respectively,on the mass of the VLQ-Xmx as well as the relevant parameters(Br(X→_(t)W))for mx≥1500GeV and the coupling strength g^(*) for mx≥1500 GeV)for some typical luminosities at the 3 TeV CLIC.

Large transverse momentum dilepton and photon production by photoproduction processes

We calculate the production of large transverse momentum dileptons and photons by using direct and resolved photoproduction processes in relativistic heavy ion collisions. Considering the central collisions of heavy nuclei at Relativistic Heavy Ion Collider （RHIC） and Large Hadron Collider （LHC） energies, we find that the photoproduction processes modify the dilepton and photon production in the large transverse momentum region.

Same-Sign Dilepton Signature in the Inert Doublet Model

In this study,we perform a detailed analysis on the same-sign dilepton signature in the inert doublet model.Focusing on the low dark matter mass region,we randomly scan the corresponding parameter space.Viable samples allowed by various constraints are obtained,and among them are twenty benchmark points that are selected for further study on collider signature.At hadron colliders,the same-sign dilepton signature is produced via pp→W^(±+)+W^(±+)jj→H^(±)H^(±)jj with the leptonic decay mode H^(±)→HW^(±)(→l^(±)ν),where H represents the dark matter candidate.We investigate the testability of this signal at the high-luminosity LHC(HL-LHC)and the proposed 27 TeV high-energy LHC(HE-LHC).According to our simulation,the HL-LHC with L=3 ab^(-1)can barely probe this signal.Meanwhile,for the HE-LHC with L=15ab^(-1),it is promising to obtain a 5σsignificance when 250 GeV≤m__(H)^(±)-m_(H)≤300 GeV with dark matter mass m_(H)60 or 71 GeV.