scholarly journals Transverse moments of TMD parton densities and ultraviolet divergences

2020 ◽  
Vol 35 (37) ◽  
pp. 2030021
Author(s):  
Ted Rogers
Keyword(s):  
Transverse Momentum ◽  
Recent Work ◽  
Correlation Functions ◽  
Integral Relation ◽  
Large Transverse Momentum ◽  
Transverse Momentum Dependent ◽  
Open Questions

I review some open questions relating to the large transverse momentum divergences in transverse moments of transverse momentum dependent (TMD) parton correlation functions. I also explain, in an abbreviated and summarized form, recent work that shows that the resulting violations of a commonly used integral relation are not perturbatively suppressed. I argue that this implies a need for more precise definitions for the correlation functions used to describe transverse moments.

OVERVIEW OF TRANSVERSE MOMENTUM DEPENDENT FACTORIZATION BREAKING

2014 ◽  
Vol 25 ◽  
pp. 1460007 ◽  
Author(s):  
TED C. ROGERS
Keyword(s):  
Transverse Momentum ◽  
Correlation Functions ◽  
Transverse Momentum Dependent

We provide an overview of recent investigations into hard processes where the factorization into transverse momentum dependent parton correlation functions breaks down.

scholarly journals TMD Evolution for Collins Asymmetries in e+e- Annihilation and SIDIS

2015 ◽  
Vol 37 ◽  
pp. 1560027
Author(s):  
Zhong-Bo Kang ◽  
Alexei Prokudin ◽  
Peng Sun ◽  
Feng Yuan
Keyword(s):  
Transverse Momentum ◽  
Inelastic Scattering ◽  
Recent Work ◽  
Deep Inelastic Scattering ◽  
Experiment Data ◽  
Transverse Momentum Dependent ◽  
Significant Correction ◽  
Evolution Effect

In this talk, we present our recent work about QCD evolution effect on the transverse momentum dependent(TMD) observables for collins asymmetries in e+e- annihilation to di-hadron and semi-inclusive deep inelastic scattering(SIDIS) processes, by taking into account TMD evolution effect is studied under CSS formalism. Our result shows the evolution effect will bring a significant correction to TMD distributions extracted form experiment data.

TMD FACTORIZATION AND EVOLUTION FOR TMD CORRELATION FUNCTIONS

2011 ◽  
Vol 04 ◽  
pp. 97-105 ◽  
Author(s):  
S. MERT AYBAT ◽  
TED C. ROGERS
Keyword(s):  
Transverse Momentum ◽  
Correlation Functions ◽  
Parton Distribution ◽  
Higher Order ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Hard Part ◽  
Transverse Momentum Dependent ◽  
Unpolarized Case ◽  
Fragmentation Functions

We discuss the application of transverse momentum dependent (TMD) factorization theorems to phenomenology. Our treatment relies on recent extensions of the Collins-Soper-Sterman (CSS) formalism. Emphasis is placed on the importance of using well-defined TMD parton distribution functions (PDFs) and fragmentation functions (FFs) in calculating the evolution of these objects. We explain how parametrizations of unpolarized TMDs can be obtained from currently existing fixed-scale Gaussian fits and previous implementations of the CSS formalism in the Drell-Yan process, and provide some examples. We also emphasize the importance of agreed-upon definitions for having an unambiguous prescription for calculating higher orders in the hard part, and provide examples of higher order calculations. We end with a discussion of strategies for extending the phenomenological applications of TMD factorization to situations beyond the unpolarized case.

scholarly journals Factorization of e+e− → H X cross section, differential in zh, PT and thrust, in the 2-jet limit

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
M. Boglione ◽  
A. Simonelli
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Belle Collaboration ◽  
Hadron Production ◽  
Leading Order ◽  
Transverse Momentum Dependent ◽  
Factorization Scheme ◽  
Phenomenological Studies ◽  
Cross Section Differential ◽  
Perturbative Part

Abstract Factorizing the cross section for single hadron production in e+e− annihilations is a highly non trivial task when the transverse momentum of the outgoing hadron with respect to the thrust axis is taken into account. We work in a scheme that allows to factorize the e+e−→ H X cross section as a convolution of a calculable hard coefficient and a Transverse Momentum Dependent (TMD) fragmentation function. The result, differential in zh, PT and thrust, will be given to all orders in perturbation theory and explicitly computed to Next to Leading Order (NLO) and Next to Leading Log (NLL) accuracy. The predictions obtained from our computation, applying the simplest and most natural ansatz to model the non-perturbative part of the TMD, are in exceptional agreement with the experimental measurements of the BELLE Collaboration. The factorization scheme we propose relates the TMD parton densities defined in 1-hadron and 2-hadron processes, restoring the possi- bility to perform global phenomenological studies of TMD physics including experimental data from semi-inclusive deep inelastic scattering, Drell-Yan processes, e+e−→ H1H2X and e+e−→ H X annihilations.

scholarly journals Two-loop QCD-EW master integrals for Z plus jet production at large transverse momentum

2020 ◽  
Vol 2020 (5) ◽  
Author(s):  
Hjalte Frellesvig ◽  
Kirill Kudashkin ◽  
Christopher Wever
Keyword(s):  
Transverse Momentum ◽  
Large Transverse Momentum ◽  
Jet Production

scholarly journals PHENOMENOLOGY OF THE SIVERS EFFECT WITH TMD EVOLUTION

2012 ◽  
Vol 20 ◽  
pp. 145-152
Author(s):  
M. ANSELMINO ◽  
M. BOGLIONE ◽  
S. MELIS
Keyword(s):  
Transverse Momentum ◽  
Evolution Equations ◽  
Distribution Functions ◽  
Dependent Data ◽  
Clear Indication ◽  
Transverse Momentum Dependent ◽  
Sidis Data ◽  
Sivers Function ◽  
Theoretical Developments

Recently, theoretical developments have led to the QCD evolution equations for the unpolarized Transverse Momentum Dependent (TMD) distribution functions and for the Sivers function (TMD-evolution). We tested whether the proposed TMD-evolution can already be observed in the SIDIS data on the Sivers asymmetry. Although very preliminary, our analysis shows that data are compatible with such an evolution with a clear indication of evolution in the x-dependent data subsets.

scholarly journals Transverse-momentum-dependent parton distributions up to N3LL from Drell-Yan data

2020 ◽  
Vol 2020 (7) ◽  
Author(s):  
Alessandro Bacchetta ◽  
Valerio Bertone ◽  
Chiara Bissolotti ◽  
Giuseppe Bozzi ◽  
Filippo Delcarro ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Parton Distributions ◽  
Transverse Momentum Dependent

Anomalous nuclear enhancement in large transverse momentum hadron production

1989 ◽  
Vol 40 (3) ◽  
pp. 1545-1547
Author(s):  
Jayanti Mahalanabis ◽  
P. Bandyopadhyay
Keyword(s):  
Transverse Momentum ◽  
Hadron Production ◽  
Large Transverse Momentum
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