Calculating dihadron fragmentation functions in the Nambu–Jona-Lasinio–jet model

Casey, A.; Matevosyan, Hrayr H.; Thomas, A. W.

doi:10.1103/physrevd.85.114049

Cited by 17 publications

(19 citation statements)

References 91 publications

(108 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The original model of Field and Feynman [2,3] has been significantly extended in recent years to describe various phenomena in hadronization in the so-called NJL-jet model, which uses the NJL effective quark model [9,10] to calculate the input elementary hadron emission probabilities. The extensions include the calculations of the collinear FFs for various hadrons [8,[21][22][23], transverse-momentumdependent FFs [24], dihadron FFs [25][26][27][28] and spindependent effects [29][30][31]. The latter have proven especially challenging, as the naive interpretations of the polarization transfer dynamics lead to higher-order Collins modulations [32] that are nonphysical, while the probabilities of hadron emission should only depend linearly on the polarization of the initial quark.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo implementation of polarized hadronization

2017

Self Cite

View full text Add to dashboard Cite

We study the polarized quark hadronization in a Monte Carlo (MC) framework based on the recent extension of the quark-jet framework, where a self-consistent treatment of the quark polarization transfer in a sequential hadronization picture has been presented. Here, we first adopt this approach for MC simulations of the hadronization process with a finite number of produced hadrons, expressing the relevant probabilities in terms of the eight leading twist quark-to-quark transversemomentum-dependent (TMD) splitting functions (SFs) for elementary q → q + h transition. We present explicit expressions for the unpolarized and Collins fragmentation functions (FFs) of unpolarized hadrons emitted at rank 2. Further, we demonstrate that all the current spectator-type model calculations of the leading twist quark-to-quark TMD SFs violate the positivity constraints, and we propose a quark model based ansatz for these input functions that circumvents the problem. We validate our MC framework by explicitly proving the absence of unphysical azimuthal modulations of the computed polarized FFs, and by precisely reproducing the earlier derived explicit results for rank-2 pions. Finally, we present the full results for pion unpolarized and Collins FFs, as well as the corresponding analyzing powers from high statistics MC simulations with a large number of produced hadrons for two different model input elementary SFs. The results for both sets of input functions exhibit the same general features of an opposite signed Collins function for favored and unfavored channels at large z and, at the same time, demonstrate the flexibility of the quark-jet framework by producing significantly different dependences of the results at mid to low z for the two model inputs.

show abstract

Section: Introductionmentioning

confidence: 99%

Monte Carlo implementation of polarized hadronization

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…[74], integral equations for the single hadron and dihadron fragmentation functions from the NJL-jet model are described, and the method employed to solve them at the model scale of Q …”

Section: Single Hadron and Dihadron Fragmentation Functions From mentioning

confidence: 99%

“…[74]. In this paper, they are used as the input for the DFF evolution equations that will be discussed in Secs.…”

Section: Single Hadron and Dihadron Fragmentation Functions From mentioning

confidence: 99%

Dihadron fragmentation functions from the NJL-jet model and their QCD evolution

et al. 2012

Self Cite

View full text Add to dashboard Cite

We present results for dihadron fragmentation functions from the NJL-jet model evolved from the model scale to a typical experimental scale of 4 GeV 2 . The numerical method used in this evolution is discussed in detail. The effect of evolution on the shapes of the dihadron fragmentation functions is discussed for a doubly favored process (u → π + π − ), as well as a singly favored (u → π + K − ) process involving light quarks. Finally, we explore the production of K + K − pairs from an initial u, d or s quark.

show abstract

“…For theoretical models of DFF, a detailed picture of the hadronization final states should be given, as the leading hadron approximation typically used in FF models is insufficient here. On the other hand, the comparison of the DFFs with experimental extractions would serve as an extra constraint on these models which provide a complete hadronization description, such as the Lund model [4] implemented in the PYTHIA event generator [5,6] and those based on the quark-jet model [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Vector Meson Decays on Dihadron Fragmentation Functions

Matevosyan

Thomas

Bentz

2014

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

Abstract. Dihadron Fragmentation Functions (DFF) provide a vast amount of information on the intricate details of the parton hadronization process. Moreover, they provide a unique access to the "clean" extraction of nucleon transversity parton distribution functions in semi inclusive deep inelastic two hadron production process with a transversely polarised target. On the example of the u → π + π − , we analyse the properties of unpolarised DFFs using their probabilistic interpretation. We use both the NJL-jet hadronization model and PYTHIA 8.1 event generator to explore the effect of the strong decays of the vector mesons produced in the quark hadronization process on the pseudoscalar DFFs. Our study shows that, even though it is less probable to produce vector mesons in the hadronization process than pseudo scalar mesons of the same charge, the products of their strong decays drastically affect the DFFs for pions because of the large combinatorial factors. Thus, an accurate description of both vector meson production and decays are crucial for theoretical understanding of DFFs.

show abstract

Calculating dihadron fragmentation functions in the Nambu–Jona-Lasinio–jet model

Cited by 17 publications

References 91 publications

Monte Carlo implementation of polarized hadronization

Monte Carlo implementation of polarized hadronization

Dihadron fragmentation functions from the NJL-jet model and their QCD evolution

The Effect of Vector Meson Decays on Dihadron Fragmentation Functions

Contact Info

Product

Resources

About