scholarly journals Drell-Yan lepton pair production at the LHC and transverse momentum dependent quark densities of the proton

2014 ◽  
Vol 89 (9) ◽  
Author(s):  
S. P. Baranov ◽  
A. V. Lipatov ◽  
N. P. Zotov
Keyword(s):  
Transverse Momentum ◽  
Pair Production ◽  
Lepton Pair ◽  
Transverse Momentum Dependent ◽  
Lepton Pair Production

VECTOR MESON-HADRON COLLISIONS: LARGE INVARIANT MASS AND TRANSVERSE MOMENTUM LEPTON PAIR PRODUCTION

1994 ◽  
Vol 09 (29) ◽  
pp. 5077-5095 ◽  
Author(s):  
SHAHIN S. AGAEV
Keyword(s):  
Transverse Momentum ◽  
Vector Meson ◽  
Pair Production ◽  
Invariant Mass ◽  
Perturbative Qcd ◽  
General Expression ◽  
Lepton Pair ◽  
Proton Collision ◽  
Lepton Pair Production

In the framework of factorized perturbative QCD, higher twist mesonic binding effects in lepton pair production in vector meson-hadron collisions are investigated. A general expression for the higher twist contributions is derived. As an example, these contributions are calculated in the case of the ρ meson-proton collision and comparisons are made to leading twist ones. It is shown that the higher twist contributions induced by a transversely polarized ρT meson are large for all values of the dilepton transverse momentum pT (2 GeV≤pT≤6 GeV). In the kinematic regimes τ=Q2/S→1 or xF→1, the higher twist corrections induced by both ρT and ρL exceed considerably the leading ones. The Drell-Yan processes with dilepton rapidity y>0 are especially preferable for the observation of these effects.

scholarly journals ON RAPIDITY DIVERGENCES IN THE SOFT AND COLLINEAR LIMITS OF QCD

2014 ◽  
Vol 25 ◽  
pp. 1460005 ◽  
Author(s):  
MIGUEL G. ECHEVARRIA ◽  
AHMAD IDILBI ◽  
IGNAZIO SCIMEMI
Keyword(s):  
Transverse Momentum ◽  
Parton Distribution Function ◽  
Lepton Pair ◽  
Matrix Elements ◽  
Long Distance ◽  
Transverse Momentum Dependent ◽  
Soft Matrix ◽  
Lepton Pair Production ◽  
Infra Red ◽  
Definition Of

We consider the definition of a transverse-momentum-dependent parton distribution function (TMDPDF) and its evolution properties given a factorization theorem of Drell-Yan lepton pair production with a non-vanishing transverse momentum. We discuss rapidity divergences that exist in both limits of QCD: the soft and collinear. We argue that only when a specific combination of the soft and collinear matrix elements is formed, rapidity divergences cancel. We also argue that the soft matrix element, calculated in perturbation theory, contains only rapidity divergences and there is no genuine long-distance infra-red divergences.

scholarly journals Lepton-pair production in dipion τ lepton decays

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
J. L. Gutiérrez Santiago ◽  
G. López Castro ◽  
P. Roig
Keyword(s):  
Pair Production ◽  
Lepton Pair ◽  
Lepton Pair Production ◽  
Lepton Decays

scholarly journals Global analysis of the Sivers functions at NLO+NNLL in QCD

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Miguel G. Echevarria ◽  
Zhong-Bo Kang ◽  
John Terry
Keyword(s):  
Pair Production ◽  
Global Analysis ◽  
Vector Boson ◽  
Lepton Pair ◽  
Transverse Spin ◽  
Dglap Evolution ◽  
Spin Asymmetries ◽  
Lepton Pair Production ◽  
Asymmetry Data ◽  
The Impact

Abstract We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair production at COMPASS, and from W/Z boson at RHIC. This extraction is performed at next-to-leading order (NLO) and next-to-next-to leading logarithmic (NNLL) accuracy. We find excellent agreement between our extracted asymmetry and the experimental data for SIDIS and Drell-Yan lepton pair production, while tension arises when trying to describe the spin asymmetries of W/Z bosons at RHIC. We carefully assess the situation, and we study in details the impact of the RHIC data and their implications through different ways of performing the fit. In addition, we find that the quality of the description of W/Z vector boson asymmetry data could be strongly sensitive to the DGLAP evolution of Qiu-Sterman function, besides the usual TMD evolution. We present discussion on this and the implications for measurements of the transverse-spin asymmetries at the future Electron Ion Collider.

scholarly journals Heavy lepton pair production in nucleus–nucleus collisions at LHC energy – a case study

2012 ◽  
Vol 889 ◽  
pp. 1-7
Author(s):  
Jan-e Alam ◽  
Bedangadas Mohanty ◽  
Sarbani Majumder ◽  
Sanjay K. Ghosh ◽  
Rajarshi Ray
Keyword(s):  
Pair Production ◽  
Lepton Pair ◽  
Heavy Lepton ◽  
Lepton Pair Production
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