scholarly journals HadronicJψproduction calculated in the NRQCD factorization formalism

1996 ◽  
Vol 54 (5) ◽  
pp. 3608-3618 ◽  
Author(s):  
Sean Fleming ◽  
Ivan Maksymyk
Keyword(s):  
Factorization Formalism

scholarly journals Transverse Momentum Resummation for Z boson Plus Jet Production at the LHC

2020 ◽  
Vol 235 ◽  
pp. 02003
Author(s):  
Peng Sun ◽  
Bin Yan ◽  
C.-P. Yan ◽  
Feng Yuan
Keyword(s):  
Transverse Momentum ◽  
Z Boson ◽  
Numerical Results ◽  
Transverse Momentum Dependent ◽  
Jet Production ◽  
Associated Production ◽  
Factorization Formalism ◽  
Leading Logarithm

We study the transverse momentum resummation effects for the Z boson plus jet associated production at the LHC within the transverse momentum dependent (TMD) factorization formalism. The large logarithm ln (Q2/q⊥2) with Q ≫ q⊥ has been resumed to Next-to-Leading Logarithm (NLL) accuracy. We compare our numerical results to the CMS data by reweighting method. It shows that our prediction agree with the data very well.

scholarly journals NRQCD: Fundamentals and Applications to Quarkonium Decay and Production

2006 ◽  
Vol 21 (04) ◽  
pp. 785-792 ◽  
Author(s):  
Geoffrey T. Bodwin
Keyword(s):  
Current Status ◽  
Experimental Measurements ◽  
Factorization Formalism ◽  
Quarkonium Production

I discuss NRQCD and, in particular, the NRQCD factorization formalism for quarkonium production and decay. I also summarize the current status of the comparison between the predictions of NRQCD factorization and experimental measurements.

scholarly journals DOUBLE PARTON FRAGMENTATION FUNCTION AND ITS EVOLUTION IN QUARKONIUM PRODUCTION

2014 ◽  
Vol 25 ◽  
pp. 1460040
Author(s):  
ZHONG-BO KANG
Keyword(s):  
Fragmentation Function ◽  
Evolution Equations ◽  
Heavy Quarkonia ◽  
Large Transverse Momentum ◽  
Heavy Quark Mass ◽  
Qcd Factorization ◽  
Factorization Formalism ◽  
Quarkonium Production ◽  
Large Enhancement ◽  
Fragmentation Functions

We summarize the results of a recent study on a new perturbative QCD factorization formalism for the production of heavy quarkonia of large transverse momentum pT at collider energies. Such a new factorization formalism includes both the leading power (LP) and next-to-leading power (NLP) contributions to the cross section in the [Formula: see text] expansion for heavy quark mass mQ. For the NLP contribution, the so-called double parton fragmentation functions are involved, whose evolution equations have been derived. We estimate fragmentation functions in the non-relativistic QCD formalism, and found that their contribution reproduce the bulk of the large enhancement found in explicit NLO calculations in the color singlet model. Heavy quarkonia produced from NLP channels prefer longitudinal polarization, in contrast to the single parton fragmentation function. This might shed some light on the heavy quarkonium polarization puzzle.

scholarly journals Rho-pion transition form factors in the kT -factorization formalism revisited

2018 ◽  
Vol 97 (11) ◽  
Author(s):  
Jun Hua ◽  
Shan Cheng ◽  
Ya-lan Zhang ◽  
Zhen-Jun Xiao
Keyword(s):  
Form Factors ◽  
Transition Form ◽  
Factorization Formalism

scholarly journals QCD and Rescattering in Nuclear Targets

2003 ◽  
Vol 12 (02) ◽  
pp. 149-164 ◽  
Author(s):  
Jianwei Qiu ◽  
George Sterman
Keyword(s):  
Perturbative Qcd ◽  
Factorization Formalism ◽  
Nuclear Targets

We review the extension of the factorization formalism of perturbative QCD to soft rescattering associated with hard processes in nuclei.

scholarly journals Production of the Bc Meson

1997 ◽  
Vol 12 (22) ◽  
pp. 4039-4048
Author(s):  
Yu-Qi Chen
Keyword(s):  
Transverse Momentum ◽  
Perturbative Qcd ◽  
High Energy ◽  
Factorization Formalism ◽  
Bc Meson ◽  
Hadronic Collisions

The production of the Bc and [Formula: see text] mesons was studied in the framework of the factorization formalism and perturbative QCD. Predicted results implied that an observable number of Bc and [Formula: see text] events can be produced at LEP I and at Tevatron. The fragmentation approximation describes the production of the Bc and [Formula: see text] mesons very well in high energy e+ e- collisions. In hadronic collisions, it is valid when and only when the transverse momentum PT of the produced Bc and [Formula: see text] is much larger than the mass of the Bc meson.

scholarly journals Azimuthal Asymmetries of the Drell-Yan Process in pA Collisions

2016 ◽  
Vol 40 ◽  
pp. 1660059
Author(s):  
Jian-Hua Gao
Keyword(s):  
Transverse Momentum ◽  
Quark Distribution ◽  
Lepton Pair ◽  
Parton Distributions ◽  
Transverse Momentum Dependent ◽  
Gauge Link ◽  
Factorization Formalism ◽  
Azimuthal Asymmetries ◽  
Nuclear Effects

We discuss the azimuthal asymmetries of the Drell-Yan process in nucleon-nucleus collisions at the low transverse momentum of the lepton pair. Within the transverse-momentum-dependent (TMD) factorization formalism, the nuclear effects of these azimuthal asymmetries can be from the gauge link of the TMD quark distribution. We estimate all these nuclear effects within the assumption that all the TMD parton distributions or correlations are in Gaussian forms.

scholarly journals Determining Color-Octet ψ-Production Matrix Elements from γp and ep Processes

1997 ◽  
Vol 12 (22) ◽  
pp. 3995-4004 ◽  
Author(s):  
Sean Fleming
Keyword(s):  
Experimental Data ◽  
Phase Space ◽  
Momentum Transfer ◽  
Large Momentum Transfer ◽  
Large Momentum ◽  
Matrix Elements ◽  
Forward Region ◽  
Color Octet ◽  
Factorization Formalism

We calculate, within the NRQCD factorization formalism, the leading color-octet contributions to ψ production in photon-nucleon and electron-nucleon collisions. The expressions we obtaine depend on the NRQCD matrix elements [Formula: see text] and [Formula: see text]. These matrix elements can be determined by fitting to experimental data. The color-octet contribution to ψ photoproduction is in the forward region of phase space, where there may be large corrections to the NRQCD result from higher twist terms. As to ψ leptoproduction we point out that the theoretical uncertainties plaguing the photoproduction calculation vanish in the large momentum transfer limit. In this region of phase space the NRQCD formalism should be valid, making ψ leptoproduction an ideal laboratory for testing the theory.

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