退耦近似在重味夸克分布函数标度演化中的应用
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摘要
核子中存在非微扰的intrinsic重味夸克FOCK态是量子色动力学的一个严格理论预言,对这个预言的研究是当前重味夸克物理中的一个重要课题.采用退耦近似,忽略intrinsic重味夸克与轻味夸克及胶子的混合贡献,可把异常复杂的重整化群演化方程近似处理为通常的胶子、轻味夸克、extrinsic重味夸克演化方程及intrinsic重味夸克非单态演化方程.详细分析intrinsic粲夸克概率为1%,3.5%情况下退耦近似演化的计算结果,对退耦近似的可信度进行详细分析,给出退耦近似下任意概率粲夸克分布.
The existence of non-perturbative intrinsic heavy quark FOCK states in nucleon is a strict prediction of quantum chromodynamics on which the research is currently an important topic in heavy quark physics.With decoupling approximation,ignoring the mixed item of intrinsic heavy quark and gluon,the mixed item of intrinsic heavy quark and light quark,the extremely sophisticated renormalization group evolution equation can be approximated to the light quark,extrinsic heavy quark and gluon standard evolution equation and intrinsic heavy quark non-singlet evolution equation.This paper analyzed the decoupling approximation results in the two cases of intrinsic charm quark probabilityω=1%,ω=3.5%,The reliability of decoupling approximation was studied in detail.The arbitrary probability charm quark distribution with decoupling approximation was given.
The existence of non-perturbative intrinsic heavy quark FOCK states in nucleon is a strict prediction of quantum chromodynamics on which the research is currently an important topic in heavy quark physics.With decoupling approximation,ignoring the mixed item of intrinsic heavy quark and gluon,the mixed item of intrinsic heavy quark and light quark,the extremely sophisticated renormalization group evolution equation can be approximated to the light quark,extrinsic heavy quark and gluon standard evolution equation and intrinsic heavy quark non-singlet evolution equation.This paper analyzed the decoupling approximation results in the two cases of intrinsic charm quark probabilityω=1%,ω=3.5%,The reliability of decoupling approximation was studied in detail.The arbitrary probability charm quark distribution with decoupling approximation was given.
引文
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[2]BRODSKY S J,HOYER P,PETERSON C,et al.The intrinsic charm of the proton[J].Phys Lett B,1980,93:451-455.
[3]BRODSKY S J,PETERSON C,SAKAI N.Intrinsic heavy-quark states[J].Phys Rev D,1981,23:2745.
[4]GRIBOV V N,LIPATOV L N.Deep inelastic e p scattering in perturbation theory[J].Sov J Nucl Phys,1972,15:438-450.
[5]BRODSKY S J,BEDNYAKOV V A,LYKASOV G I,et al.The physics of heavy quark distributions in hadrons:collider tests[J].Progress in Particle and Nuclear Physics,2017,93:108-142.
[6]AUBERT J J,BASSOMPIERRE G,BECKS K H,et al.Production of charmed particles in 250GeVμ+iron interactions[J].Nucl Phys B,1983,213:31-64.
[7]BARI G,BASILE M,BRUNI G,et al.A measurement of Λ_c~+baryon production in proton-proton interactions at ~(1/2)s=62GeV[J].Nuovo Cim A,1991,104:571-599.
[8]VOGT R,BRODSKY S J,HOYER P.Systematics of charm production inhadronic collisions[J].Nucl Phys B,1992,383:643-684.
[9]VOGT R,BRODSKY S J.Charmed hadron asymmetries in the intrinsic charm coalescence model[J].Nucl Phys B,1996,478:311-332.
[10]GUTIERREZ T,VOGT R.Leading charm in hadron-nucleus interactions in the intrinsic charm model[J].Nucl Phys B,1999,539:189-214.
[11]VOGT R,BRODSKY S J,HOYER P.Systematics of J/ψproduction in nuclear collisions[J].Nucl Phys B,1991,360:67-96.
[12]VOGT R,BRODSKY S J.Intrinsic charm contribution to double quarkonium hadroproduction[J].Phys Lett B,1995,349:569-575.
[13]FREEMAN W,TOUSSAINT D.Intrinsic strangeness and charm of the nucleon using improved staggered fermions[J].Phys Rev D,2013,88:054503.
[14]KRYJEVSKI A.Heavy quark qq matrix elements in the nucleon from perturbative QCD[J].Phys Rev D,2004,70:094028.
[15]NAVARRA F S,NIELSEN M,NUNES C A A,et al.Intrinsic charm component of the nucleon[J].Phys Rev D,1996,54:842-846.
[16]PAIVA S,NIELSEN M,NAVARRA F S,et al.Virtual meson cloud of the nucleon and intrinsic strangeness and charm[J].Mod Phys Lett A,1998,13:2715-2723.
[17]BRODSKY S J,HOYER P,PETERSON C,et al.The intrinsic charm of the proton[J].Phys Lett B,1980,93:451-455.
[18]PUMPLIN J,LAI H L,TUNG W K.Charmparton content of the nucleon[J].Phys Rev D,2007,75:054029.
[19]LYONNET F,KUSINA A,JEZO T,et al.On the intrinsic bottom content of the nucleon and its impact on heavy new physics at the LHC[J].JHEP,2015,2015(7):1-23.
[20]LYONNET F.Intrinsic bottom and its impact on heavy new physics at the LHC[J].EPJ Web of Conferences,2016,112:03005.
[21]FURMANSKI W,PETRONZIO R.Singlet parton densities beyond leading order[J].Phys Lett B,1980,97:437-442.