scholarly journals Next-to-leading order determination of fragmentation functions

2001 ◽  
Vol 19 (1) ◽  
pp. 89-98 ◽  
Author(s):  
L. Bourhis ◽  
M. Fontannaz ◽  
J.Ph. Guillet ◽  
M. Werlen
Keyword(s):  
Leading Order ◽  
Fragmentation Functions ◽  
Order Determination

scholarly journals Next-to-leading order determination of pion fragmentation functions

1994 ◽  
Vol 412 (1-2) ◽  
pp. 3-38 ◽  
Author(s):  
P. Chiappetta ◽  
M. Greco ◽  
J.-Ph. Guillet ◽  
S. Rolli ◽  
M. Werlen
Keyword(s):  
Leading Order ◽  
Fragmentation Functions ◽  
Order Determination

scholarly journals Leading order determination of the gluon polarisation from DIS events with high-pThadron pairs

2013 ◽  
Vol 718 (3) ◽  
pp. 922-930 ◽  
Author(s):  
C. Adolph ◽  
M.G. Alekseev ◽  
V.Yu. Alexakhin ◽  
Yu. Alexandrov ◽  
G.D. Alexeev ◽  
...  
Keyword(s):  
Leading Order ◽  
Order Determination

scholarly journals Unpolarized quark and gluon TMD PDFs and FFs at N3LO

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Ming-xing Luo ◽  
Tong-Zhi Yang ◽  
Hua Xing Zhu ◽  
Yu Jiao Zhu
Keyword(s):  
Distribution Functions ◽  
Leading Order ◽  
Momentum Fraction ◽  
Parton Distribution Functions ◽  
Third Order ◽  
Probability Interpretation ◽  
Transverse Momentum Dependent ◽  
Precision Determination ◽  
Fragmentation Functions

Abstract In this paper we calculate analytically the perturbative matching coefficients for unpolarized quark and gluon Transverse-Momentum-Dependent (TMD) Parton Distribution Functions (PDFs) and Fragmentation Functions (FFs) through Next-to-Next-to-Next-to-Leading Order (N3LO) in QCD. The N3LO TMD PDFs are calculated by solving a system of differential equation of Feynman and phase space integrals. The TMD FFs are obtained by analytic continuation from space-like quantities to time-like quantities, taking into account the probability interpretation of TMD PDFs and FFs properly. The coefficient functions for TMD FFs exhibit double logarithmic enhancement at small momentum fraction z. We resum such logarithmic terms to the third order in the expansion of αs. Our results constitute important ingredients for precision determination of TMD PDFs and FFs in current and future experiments.

scholarly journals Leading-order determination of the gluon polarization from high-p T hadron electroproduction

2010 ◽  
Vol 2010 (8) ◽  
Author(s):  
A. Airapetian ◽  
◽  
N. Akopov ◽  
Z. Akopov ◽  
E. C. Aschenauer ◽  
...  
Keyword(s):  
Leading Order ◽  
Gluon Polarization ◽  
Order Determination

scholarly journals Constraints on neutrino non-standard interactions from LHC data with large missing transverse momentum

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
DianYu Liu ◽  
ChuanLe Sun ◽  
Jun Gao
Keyword(s):  
Transverse Momentum ◽  
Neutral Current ◽  
Data Sets ◽  
Leading Order ◽  
Missing Transverse Momentum ◽  
Upper Limit ◽  
Theoretical Predictions ◽  
Parton Showering ◽  
Single Jet

Abstract The possible non-standard interactions (NSIs) of neutrinos with matter plays important role in the global determination of neutrino properties. In our study we select various data sets from LHC measurements at 13 TeV with integrated luminosities of 35 ∼ 139 fb−1, including production of a single jet, photon, W/Z boson, or charged lepton accompanied with large missing transverse momentum. We derive constraints on neutral-current NSIs with quarks imposed by different data sets in a framework of either effective operators or simplified Z′ models. We use theoretical predictions of productions induced by NSIs at next-to-leading order in QCD matched with parton showering which stabilize the theory predictions and result in more robust constraints. In a simplified Z′ model we obtain a 95% CLs upper limit on the conventional NSI strength ϵ of 0.042 and 0.0028 for a Z′ mass of 0.2 and 2 TeV respectively. We also discuss possible improvements from future runs of LHC with higher luminosities.

scholarly journals Determination of the strange quark content of the nucleon from a next-to-leading-order QCD analysis of neutrino charm production

1995 ◽  
Vol 65 (2) ◽  
pp. 189-198 ◽  
Author(s):  
◽  
A. O. Bazarko ◽  
C. G. Arroyo ◽  
K. T. Bachmann ◽  
T. Bolton ◽  
...  
Keyword(s):  
Strange Quark ◽  
Charm Production ◽  
Leading Order ◽  
Qcd Analysis ◽  
Quark Content
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