scholarly journals Non-Extensive Motivated Parton Fragmentation Functions

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 12 ◽  
Author(s):  
Adam Takacs ◽  
Gergely Gábor Barnaföldi
Keyword(s):  
Experimental Data ◽  
Fragmentation Function ◽  
Jet Fragmentation ◽  
Fragmentation Functions ◽  
New Form ◽  
Scale Evolution

A new form of fragmentation function is presented here, motivated by earlier non-extensive studies of jet fragmentation. We parametrized our Tsallis-like function on pion spectra and compared it to the most common fragmentation function parametrizations. It is shown that the new form is in agreement with earlier parametrizations, furthermore, its scale evolution overlaps better with the experimental data.

Advanced Dryout Correlation for BWR Fuel

2010 ◽  
Author(s):  
D. Paramonov ◽  
C. Adamsson
Keyword(s):  
Experimental Data ◽  
Regression Coefficients ◽  
Qualitative Behavior ◽  
Empirical Correlations ◽  
Operational Space ◽  
Power Profile ◽  
Fuel Design ◽  
New Form ◽  
Additional Value ◽  
Dry Out

Each BWR fuel design requires a method to predict its dryout performance in order to be licensed. Presently, the assessment of dry-out risk is based on empirical correlations, which sometimes results in inaccurate or non-physical predictions in certain portions of operational space. This poses a number of limitations as plant operators seek to extract additional value from the fuel through more aggressive operation strategies. A new form of BWR dryout correlation is developed. Accuracy of predictions outside of experimental data range is increased by employing a non-linear correlation form and the transformation to axial power profile, which is based on physical considerations. Proper qualitative behavior is assured by the correlation form itself rather than values of regression coefficients.

scholarly journals $a_S$ from soft QCD jet fragmentation functions

2019 ◽  
Author(s):  
Redamy Pérez Ramos ◽  
David d’Enterria
Keyword(s):  
Jet Fragmentation ◽  
Fragmentation Functions

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 Jet fragmentation function moments in heavy ion collisions

2013 ◽  
Vol 73 (3) ◽  
Author(s):  
Matteo Cacciari ◽  
Paloma Quiroga-Arias ◽  
Gavin P. Salam ◽  
Gregory Soyez
Keyword(s):  
Fragmentation Function ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Jet Fragmentation

scholarly journals Sivers Asymmetry with QCD Evolution

2015 ◽  
Vol 37 ◽  
pp. 1560025 ◽  
Author(s):  
Miguel G. Echevarria ◽  
Ahmad Idilbi ◽  
Zhong-Bo Kang ◽  
Ivan Vitev
Keyword(s):  
Experimental Data ◽  
W Boson ◽  
Lepton Pair ◽  
Boson Production ◽  
Transverse Momentum Dependent ◽  
Sudakov Factor ◽  
Sign Change ◽  
Sivers Function ◽  
Fragmentation Functions ◽  
Global Fitting

We analyze the Sivers asymmetry in both Drell-Yan (DY) production and semi-inclusive deep inelastic scattering (SIDIS), while considering properly defined transverse momentum dependent parton distribution and fragmentation functions and their QCD evolution. After finding a universal non-perturbative spin-independent Sudakov factor that can describe reasonably well the world's data of SIDIS, DY lepton pair and W/Z production in unpolarized scatterings, we perform a global fitting of all the experimental data on the Sivers asymmetry in SIDIS from HERMES, COMPASS and Jefferson Lab. Then we make predictions for the asymmetry in DY lepton pair and W boson production, which could be compared to the future experimental data in order to test the sign change of the Sivers function.

scholarly journals NEXT-TO-LEADING ORDER CALCULATION OF THE COLOR-OCTET 3S1 GLUON FRAGMENTATION FUNCTION FOR HEAVY QUARKONIUM

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 229-231
Author(s):  
JUNGIL LEE
Keyword(s):  
Fragmentation Function ◽  
Short Distance ◽  
Feynman Diagrams ◽  
Heavy Quarkonium ◽  
Leading Order ◽  
Light Cone Gauge ◽  
Color Octet ◽  
Feynman Gauge ◽  
Fragmentation Functions ◽  
Gluon Fragmentation

Next-to-leading order corrections to fragmentation functions in a light-cone gauge are discussed. This gauge simplifies the calculation by eliminating many Feynman diagrams at the expense of introducing spurious poles in loop integrals. As an application, the short-distance coefficients for the color-octet 3S1 term in the fragmentation function for a gluon to split into polarized heavy quarkonium states are re-calculated to order [Formula: see text]. We show that the ill-defined spurious poles cancel and the appropriate prescriptions for the remaining spurious poles can be determined by calculating a subset of the diagrams in the Feynman gauge. Our answer agrees with the recent calculation of Braaten and Lee in the Feynman gauge, but disagrees with another previous calculation.

scholarly journals Polarized jet fragmentation functions

2020 ◽  
Vol 809 ◽  
pp. 135756 ◽  
Author(s):  
Zhong-Bo Kang ◽  
Kyle Lee ◽  
Fanyi Zhao
Keyword(s):  
Jet Fragmentation ◽  
Fragmentation Functions

scholarly journals Medium modification of γ-jet fragmentation functions in Pb+Pb collisions at LHC

2020 ◽  
Vol 810 ◽  
pp. 135783
Author(s):  
Wei Chen ◽  
Shanshan Cao ◽  
Tan Luo ◽  
Long-Gang Pang ◽  
Xin-Nian Wang
Keyword(s):  
Jet Fragmentation ◽  
Medium Modification ◽  
Fragmentation Functions
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