On kaon production in e+e- and semi-inclusive DIS reactions

Christova, Ekaterina; Leader, Elliot

doi:10.1140/epjc/s10052-007-0338-z

Cited by 27 publications

(39 citation statements)

References 5 publications

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“…This was later shown to be in fair agreement with charged pion multiplicities in SIDIS from HERMES [18] within a LO combined analysis of SIA and SIDIS data [34]; see also Fig. 4 and discussions below.…”

Section: A Parametrizationsupporting

confidence: 71%

Global analysis of fragmentation functions for pions and kaons and their uncertainties

2007

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We present new sets of pion and kaon fragmentation functions obtained in NLO combined analyses of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and deep-inelastic lepton-proton scattering with either pions or kaons identified in the final state. At variance with all previous fits, the present analyses take into account data where hadrons of different electrical charge are identified, which allow to discriminate quark from anti-quark fragmentation functions without the need of non trivial flavor symmetry assumptions. The resulting sets are in good agreement with all data analyzed, which cover a much wider kinematical range than in previous fits. An extensive use of the Lagrange multiplier technique is made in order to assess the uncertainties in the extraction of the fragmentation functions and the synergy from the complementary data sets in our global analysis.

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Section: A Parametrizationsupporting

confidence: 71%

Global analysis of fragmentation functions for pions and kaons and their uncertainties

2007

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“…The fragmentation function characterizes the probability for a hadron fragmented from a quark with the momentum fraction z. It plays a crucial role in analyzing the semi-inclusive processes in the electron-positron scattering, deep-inelastic proton-proton scattering, and so on [1][2][3][4][5][6][7][8][9][10][11]. The parton distribution function provides information for the distribution of the momentum fraction x carried by a parton inside a hadron.…”

Section: Introductionmentioning

confidence: 99%

Fragmentation functions and parton distribution functions for the pion with the nonlocal interactions

Nam

Kao

2012

Phys. Rev. D

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We study the unpolarized fragmentation functions and parton distribution functions of the pion employing the nonlocal chiral quark model. This model manifests the nonlocal interactions between the quarks and pseudoscalar mesons in the light-cone coordinate. It turns out that the nonlocal interactions result in substantial differences in comparison to typical models with only local couplings. We also perform the high Q 2 -evolution for our results calculated at a relatively low renormalization scale Q 2 ≈ 0.36 GeV 2 to be compared with the experimental data. Our results after evolution are in qualitatively good agreement with those data.

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“…[7] shows that the different choices of parametrizations for these fragmentation functions lead to the strong disagreement in the obtained results (about 30% for valence quarks and about 100% for sea quarks). From this point of view the most attractive objects are the difference asymmetries [8] (for details on difference asymmetry in NLO see [9,5] and references therein), where the fragmentation functions are cancel out in LO, while in NLO the difference asymmetry has only weak dependence of the difference of the favored and unfavored pion fragmentation functions (known with a good precision). In Section 4 the pion difference asymmetries are constructed from the measured by HERMES standard semi-inclusive spin asymmetries.…”

Section: Introductionmentioning

confidence: 99%

NLO QCD method of the polarized semiinclusive DIS data analysis

2006

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Method of polarized semi-inclusive deep inelastic scattering (SIDIS) data analysis in the next to leading order (NLO) QCD is developed. Within the method one first directly extracts in NLO few first truncated (available to measurement) Mellin moments of the quark helicity distributions. Second, using these moments as an input to the proposed modification of the Jacobi polynomial expansion method (MJEM), one eventually reconstructs the local quark helicity distributions themselves. All numerical tests demonstrate that MJEM allows us to reproduce with the high precision the input local distributions even inside the narrow Bjorken x region accessible for experiment. It is of importance that only four first input moments are sufficient to achieve a good quality of reconstruction. The application of the method to the simulated SIDIS data on the pion production is considered. The obtained results encourage one that the proposed NLO method can be successfully applied to the SIDIS data analysis. The analysis of HERMES data on pion production is performed. To this end the pion difference asymmetries are constructed from the measured by HERMES standard semi-inclusive spin asymmetries. The LO results of the valence distribution reconstruction are in a good accordance with the respective leading order SMC and HERMES results, while the NLO results are in agreement with the existing NLO parametrizations on these quantities.

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On kaon production in e+e- and semi-inclusive DIS reactions

Cited by 27 publications

References 5 publications

Global analysis of fragmentation functions for pions and kaons and their uncertainties

Global analysis of fragmentation functions for pions and kaons and their uncertainties

Fragmentation functions and parton distribution functions for the pion with the nonlocal interactions

NLO QCD method of the polarized semiinclusive DIS data analysis

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