We present the NLO electroweak radiative corrections to the e^(+)e^(−)γ production in γγ collision,which is an ideal channel for calibrating the beam luminosity of a Photon Linear Collider.We analyze the dependence...We present the NLO electroweak radiative corrections to the e^(+)e^(−)γ production in γγ collision,which is an ideal channel for calibrating the beam luminosity of a Photon Linear Collider.We analyze the dependence of the total cross section on the beam colliding energy,and then investigate the kinematic distributions of final particles at various initial photon beam polarizations at EW NLO accuracy.The numerical results indicate that the EW relative corrections to the total cross section are non-negligible and become increasingly significant as the increase of the beam colliding energy,even can exceed -10% in the J=2 γγ collision at √s=1 TeV.Such EW corrections are very important and should be taken into consideration in precision theoretical and experimental studies at high-energy γγ colliders.展开更多
Abstract A refined one of our exactly solvable trapezoidal barrier potential model [Thin Solids Films, 414 （2002） 136）] for metal-insulator-metal tunnel junctions has Seen presented. According to the refined model,...Abstract A refined one of our exactly solvable trapezoidal barrier potential model [Thin Solids Films, 414 （2002） 136）] for metal-insulator-metal tunnel junctions has Seen presented. According to the refined model, the longitudinal kinetic energy （ExL） and the effective mass （m^＊L） of the electron8 in the electrode on the left of the barrier distinguish from that on the right. It is found that as ExL is greater than the shorter side of the resultant trapezoidal barrier potential, there will be a coexistence of the tunneling and propagating in the barrier. The results demonstrate that the damped oscillating electron waves localized in the propagating barrier subregion lead to the oscillation and enhancement in the transmission coefficient DT and dwell time TD. For the barrier height φ1=2.6 eV and φ2 = 1.4 eV, the width d=22 A and ExL = 1.0 eV, DT and TD have a maximum of 0.054 and 0.58x10^-15 s at V = 2.04 V and 2.18 V, respectively. This suggests that a real tunneling may be a hybrid.展开更多
The precision study of W^-W^+H production with subsequent W^±→l^±vl^(-)and H→bb decays at the Large Hadron Collider(LHC)aids in the investigation of Higgs gauge couplings and the search for new physics bey...The precision study of W^-W^+H production with subsequent W^±→l^±vl^(-)and H→bb decays at the Large Hadron Collider(LHC)aids in the investigation of Higgs gauge couplings and the search for new physics beyond the standard model.In this study,we calculate the shower-matched next-to-leading order QCD and electroweak(EW)corrections from the qq annihilation and photon-induced channels to the W^-W^+H production at the 14 TeV LHC.We deal with the subsequent decays of Higgs and W^±bosons by adopting the MADSPIN method.Both the integrated cross section and some kinematic distributions of W^±,H,and their decay products are provided.We find that the QCD correction significantly enhances the leading-order differential cross section,while the EW correction from the qq annihilation channel obviously suppresses it,especially in the high energy phase-space region,due to the Sudakov effect.The qy-and yy-induced relative corrections are positive and insensitive to the transverse momenta of W^±,H,and their decay products.These photon-induced corrections compensate the negative qq-initiated EW correction,and become the dominant EW contribution as the increment of the pp colliding energy.The parton shower(PS)effects on kinematic distributions are not negligible.The relative PS correction to the b-jet transverse momentum distribution can exceed 100%in the high p_(T,b)region.Moreover,we investigate the scale and PDF uncertainties,and find that the theoretical error of the QCD+EW+qγ+γγ-corrected integrated cross section mainly originates from the renormalization scale dependence of the QCD correction.展开更多
We investigate the possibility of probing R-parity violating interactions in forward-backward asymmetries, and conclude that the Tevatron collider is the best place to measure new interactions involving the first gene...We investigate the possibility of probing R-parity violating interactions in forward-backward asymmetries, and conclude that the Tevatron collider is the best place to measure new interactions involving the first generation of quarks. With additional down type squark ~dk contributions, the charge asymmetry in e＋e— events around Z-pole mass region at the Tevatron will be sensitive to R-parity violating couplings λ’11k, which was inaccessible to the LEP Qfb had inclusive measurement. Assuming no apparent deviation from SM prediction is observed, λ’11k〈 0.19 at 95% C.L. with squark mass Mdk=100 GeV can be derived.展开更多
基金Supported in part by the National Natural Science Foundation of China(11775211,12061141005)the CAS Center for Excellence in Particle Physics(CCEPP)。
文摘We present the NLO electroweak radiative corrections to the e^(+)e^(−)γ production in γγ collision,which is an ideal channel for calibrating the beam luminosity of a Photon Linear Collider.We analyze the dependence of the total cross section on the beam colliding energy,and then investigate the kinematic distributions of final particles at various initial photon beam polarizations at EW NLO accuracy.The numerical results indicate that the EW relative corrections to the total cross section are non-negligible and become increasingly significant as the increase of the beam colliding energy,even can exceed -10% in the J=2 γγ collision at √s=1 TeV.Such EW corrections are very important and should be taken into consideration in precision theoretical and experimental studies at high-energy γγ colliders.
基金Supported by the Science and Technology Foundation of Shenzhen under Grant Nos. 200604 and 200606
文摘Abstract A refined one of our exactly solvable trapezoidal barrier potential model [Thin Solids Films, 414 （2002） 136）] for metal-insulator-metal tunnel junctions has Seen presented. According to the refined model, the longitudinal kinetic energy （ExL） and the effective mass （m^＊L） of the electron8 in the electrode on the left of the barrier distinguish from that on the right. It is found that as ExL is greater than the shorter side of the resultant trapezoidal barrier potential, there will be a coexistence of the tunneling and propagating in the barrier. The results demonstrate that the damped oscillating electron waves localized in the propagating barrier subregion lead to the oscillation and enhancement in the transmission coefficient DT and dwell time TD. For the barrier height φ1=2.6 eV and φ2 = 1.4 eV, the width d=22 A and ExL = 1.0 eV, DT and TD have a maximum of 0.054 and 0.58x10^-15 s at V = 2.04 V and 2.18 V, respectively. This suggests that a real tunneling may be a hybrid.
基金Supported in part by the National Natural Science Foundation of China(11775211 and 11535002)the Applied Basic Research Programs of Yunnan Provincial Science and Technology Department(2016FB008)the CAS Center for Excellence in Particle Physics(CCEPP)
文摘The precision study of W^-W^+H production with subsequent W^±→l^±vl^(-)and H→bb decays at the Large Hadron Collider(LHC)aids in the investigation of Higgs gauge couplings and the search for new physics beyond the standard model.In this study,we calculate the shower-matched next-to-leading order QCD and electroweak(EW)corrections from the qq annihilation and photon-induced channels to the W^-W^+H production at the 14 TeV LHC.We deal with the subsequent decays of Higgs and W^±bosons by adopting the MADSPIN method.Both the integrated cross section and some kinematic distributions of W^±,H,and their decay products are provided.We find that the QCD correction significantly enhances the leading-order differential cross section,while the EW correction from the qq annihilation channel obviously suppresses it,especially in the high energy phase-space region,due to the Sudakov effect.The qy-and yy-induced relative corrections are positive and insensitive to the transverse momenta of W^±,H,and their decay products.These photon-induced corrections compensate the negative qq-initiated EW correction,and become the dominant EW contribution as the increment of the pp colliding energy.The parton shower(PS)effects on kinematic distributions are not negligible.The relative PS correction to the b-jet transverse momentum distribution can exceed 100%in the high p_(T,b)region.Moreover,we investigate the scale and PDF uncertainties,and find that the theoretical error of the QCD+EW+qγ+γγ-corrected integrated cross section mainly originates from the renormalization scale dependence of the QCD correction.
基金Supported in part by the China Postdoctoral Science Foundation （No 20080440103）, the National Natural Science Foundation of China under Grant Nos 10875112, and 10675110, and the Specialized Research Fund for the Doctoral Program of Higher Education （SRFDP） （No 20093402110030）.
文摘We investigate the possibility of probing R-parity violating interactions in forward-backward asymmetries, and conclude that the Tevatron collider is the best place to measure new interactions involving the first generation of quarks. With additional down type squark ~dk contributions, the charge asymmetry in e＋e— events around Z-pole mass region at the Tevatron will be sensitive to R-parity violating couplings λ’11k, which was inaccessible to the LEP Qfb had inclusive measurement. Assuming no apparent deviation from SM prediction is observed, λ’11k〈 0.19 at 95% C.L. with squark mass Mdk=100 GeV can be derived.
