Double Transverse-Spin Asymmetries for Small-Q[sub T] Drell-Yan Pair Production in pp̄ Collisions

2009 ◽  
Author(s):  
Hiroyuki Kawamura ◽  
Kazuhiro Tanaka ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
...  
Keyword(s):  
Pair Production ◽  
Transverse Spin ◽  
Spin Asymmetries

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 New COMPASS Results on Transverse Spin Asymmetries in Hadron Pair Production in DIS

2016 ◽  
Vol 40 ◽  
pp. 1660032 ◽  
Author(s):  
G. Sbrizzai
Keyword(s):  
Pair Production ◽  
Direct Measurement ◽  
Charged Pion ◽  
New Method ◽  
Transverse Spin ◽  
Spin Asymmetries ◽  
Azimuthal Asymmetries ◽  
Hadron Pairs ◽  
Oppositely Charged

The COMPASS measurements of the azimuthal asymmetries in the hadron pairs production in DIS on transversely polarised targets are here presented. Results on oppositely charged pion and kaon pairs produced on both deuteron and proton targets are shown. They have been used to update the calculation of the Transversity function which was previously extracted from the asymmetries measured from un-identified hadron pairs. Also a new method for the direct measurement of the integral of Transversity using both COMPASS and BELLE results is presented.

Single transverse spin asymmetries

1991 ◽  
Vol 67 (17) ◽  
pp. 2264-2267 ◽  
Author(s):  
Jianwei Qiu ◽  
George Sterman
Keyword(s):  
Transverse Spin ◽  
Spin Asymmetries

scholarly journals Origin of single transverse-spin asymmetries in high-energy collisions

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
Justin Cammarota ◽  
Leonard Gamberg ◽  
Zhong-Bo Kang ◽  
Joshua A. Miller ◽  
Daniel Pitonyak ◽  
...  
Keyword(s):  
High Energy ◽  
Transverse Spin ◽  
Spin Asymmetries ◽  
High Energy Collisions

Results on transverse spin asymmetries in the polarized proton-proton elastic scattering in the CNI region at STAR

2011 ◽  
Author(s):  
D. Svirida ◽  
Marcella Capua ◽  
Roberto Fiore ◽  
Igor Ivanov ◽  
Alessandro Papa ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Transverse Spin ◽  
Proton Proton ◽  
Spin Asymmetries ◽  
Proton Elastic Scattering ◽  
Polarized Proton
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