Quark-jet contribution to the fragmentation functions for the pion and kaon with the nonlocal interactions

Jiang

et al. 2014

Preprint

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We have calculated the unpolarized dihadron fragmentation functions (uDiFFs) of pions and kaons using the nonlocal chiral-quark model (NLChQM) and evolved our results to the transferred momentum scale Q 2 =4GeV 2 by the QCD evolution equations. These uDiFFs have also been computed in the Nambu-Jona-Lasinio-jet (NJL-jet) model for the sake of comparison. We find that there is substantial difference between the results of these two models. Furthermore, the DiFFs of u → π + π − and g → π + π − at Q 2 = 109 GeV 2 in these two models are presented in comparison with the parametrizations fitted by the Monte Carlo event generator JETSET.

Section: Introductionmentioning

confidence: 92%

Unpolarized Dihadron Fragmentation Functions in Nonlocal Chiral Quark Model

Jiang

et al. 2014

Preprint

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“…In reaching the results in Fig. 1, the values of D π,K Q (Q 2 ) and D π,K S (Q 2 ) produced from NLχQM [9] (Left)and from the NJL model [8](Right) are employed.…”

Section: Relations Between the Charged Kaon And Pion Multiplicitiesmentioning

confidence: 99%

Consistency Check of Charged Hadron Multiplicities and Fragmentation Functions in SIDIS

Kao

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

Chang

et al. 2017

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We derived the conditions on certain combinations of integrals of the fragmentation functions of pion using HERMES data for the sum of the charged pion multiplicities from semi-inclusive deepinelastic scattering (SIDIS) off the deuteron target. We have chosen several FFs to study the ratios of the strange PDFs S (x) and the nonstrange PDFs Q(x, Q 2) extracted from the charged pion and kaon multiplicities. We conclude that, in the LO QCD analysis and with the D π,K Q,S (Q 2) of the FFs chosen in our study, there is inconsistency between S (x, Q 2)/Q(x, Q 2) derived from the pion and kaon multiplicity data.Finally, we demonstrate that the HERMES pion multiplicity data are unlikely to be compatible with two widely-used PDFs, namely CTEQ6L and leading order NNPDF3.0.

“…Experimental data from SIDIS multiplicities and hadronhadron collisions provide a way to determine the flavor decomposition into quark and antiquark FFs [13]. Light parton FFs for light mesons at a low energy scale have been calculated in effective models recently, such as the Nambu-Jona-Lasinio (NJL) model [14,15] and the nonlocal chiral quark model [16]. Data for pion and kaon productions in SIA at the Z boson mass scale have been available from TASSO [17][18][19], TPC [20], HRS [21], TOPAZ [22], SLD [23], ALEPH [24], OPAL [25], and DELPHI [26,27].…”

Section: Introductionmentioning

confidence: 99%

Charm fragmentation functions in the Nambu–Jona-Lasinio model

2020

Phys. Rev. D

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We derive the fragmentation function (FF), which describes the probability for a charm quark to emit a D meson with a certain momentum fraction, in the Nambu-Jona-Lasinio model. The corresponding elementary FF is calculated with the quark-meson coupling determined in the Nambu-Jona-Lasinio model involving charm quarks. The FF in the infinite momentum frame is constructed through the jet process governed by the elementary FF, and then evolved to the charm scale, at which it is defined. To prepare the FF suitable for an analysis of D meson production at CLEO, we further match the above FF to that in the finite momentum frame at one loop in QCD. It is shown that the charm quark FF, including the finite momentum effects, leads to theoretical results in agreement with the CLEO data.