scholarly journals Breakdown of QCD factorization for P-wave quarkonium production at low transverse momentum

2014 ◽  
Vol 737 ◽  
pp. 103-108 ◽  
Author(s):  
J.P. Ma ◽  
J.X. Wang ◽  
S. Zhao
Keyword(s):  
Transverse Momentum ◽  
P Wave ◽  
Qcd Factorization ◽  
Quarkonium Production

scholarly journals Back-to-Back Isolated Photon-Quarkonium Production at the LHC and the Transverse-Momentum-Dependent Distributions of the Gluons in the Proton

2016 ◽  
Vol 40 ◽  
pp. 1660015 ◽  
Author(s):  
J. P. Lansberg
Keyword(s):  
Transverse Momentum ◽  
Experimental Determination ◽  
Heavy Quarkonia ◽  
Proton Proton ◽  
Transverse Momentum Dependent ◽  
Proton Collisions ◽  
Quarkonium Production ◽  
Linearly Polarized ◽  
Proton Proton Collisions

The study of isolated heavy quarkonia, such as [Formula: see text] and [Formula: see text], produced in association with a photon in proton-proton collisions at the LHC, is probably the optimal way to get right away a first experimental determination of two gluon transverse-momentum-dependent distribution (TMDs) in an unpolarized proton, [Formula: see text] and [Formula: see text], the latter giving the distribution of linearly polarized gluons. To substantiante this, we calculate the transverse-momentum-dependent effects that arise in the process under study and discuss the feasibility of their 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 The renormalization scale problem and novel perspectives for QCD

2015 ◽  
Vol 39 ◽  
pp. 1560108
Author(s):  
Stanley J. Brodsky
Keyword(s):  
Renormalization Scale ◽  
High Transverse Momentum ◽  
Proton Proton ◽  
Direct Production ◽  
Proton Collisions ◽  
Qcd Factorization ◽  
Quarkonium Production ◽  
Proton Proton Collisions ◽  
Principle Of Maximum

I discuss a number of novel tests of QCD, measurements which can illuminate fundamental features of hadron physics. These include the origin of the “ridge” in proton-proton collisions; the production of the Higgs at high [Formula: see text]; the role of digluon-initiated processes for quarkonium production; flavor-dependent anti-shadowing; the effect of nuclear shadowing on QCD sum rules; direct production of hadrons at high transverse momentum; and leading-twist lensing corrections; and the breakdown of perturbative QCD factorization. I also review the “Principle of Maximum Conformalit” (PMC) which systematically sets the renormalization scale order-by-order in pQCD, independent of the choice of renormalization scheme, thus eliminating an unnecessary theoretical uncertainty.

scholarly journals Heavy P -wave quarkonium production via Higgs decays

2018 ◽  
Vol 98 (3) ◽  
Author(s):  
Qi-Li Liao ◽  
Ya Deng ◽  
Yan Yu ◽  
Guang-Chuan Wang ◽  
Guo-Ya Xie
Keyword(s):  
P Wave ◽  
Quarkonium Production
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