Valence quark annihilation and leading charmed meson production in 
                $\pi^- N$
               and 
                $K^-N$
               collisions

Tashiro, Tsutomu; Noda, Hidetoshi; Kinoshita, Kisei; Nakariki, Shin‐ichi

doi:10.1007/s10052-002-0970-6

Cited by 4 publications

(9 citation statements)

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“…An obvious (global) flavor correlation that will be imposed throughout consists of "vetoing" a light (anti-) quark flavor i for the recombination process if this type has been used in the hard process of creating a cc pair, i.e., q = i. The significance of this anti-correlation mainly establishes itself for leading D-mesons (cq) in forward production with meson beams [34], where the valence anti-quark provides a large part of the cc yield.…”

Section: Flavor Correlationsmentioning

confidence: 99%

D-meson production from recombination in hadronic collisions

Rapp

Shuryak

2003

Phys. Rev. D

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Nonperturbative effects in D-meson production in pion-nucleon and proton-nucleon collisions are investigated within the recombination model. The coalescence of perturbatively created charm quarks with sea-and valence-quarks from projectile and target fragments is shown to be competitive in magnitude with standard fragmentation calculations at both central (small xF ) and forward rapidities. Corresponding flavor asymmetries for inclusive D-meson production are thus mostly generated on the (light-) parton distribution level, and turn out to be in reasonable overall agreement with available fixed-target data. Predictions for upcoming measurements at RHIC are given.

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Section: Flavor Correlationsmentioning

confidence: 99%

D-meson production from recombination in hadronic collisions

Rapp

Shuryak

2003

Phys. Rev. D

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“…Here we choose very small intrinsic transverse momenta and use the value β in = 40 used in Ref. [31] in order to reproduce p 2 T dependences of D mesons. We take account of the annihilation of the valence antiquark from beam and valence quark from target in a slightly different way from the one pointed out in Refs.…”

Section: The Model 21 Valence Quark Distributions In the Incident Hadronmentioning

confidence: 99%

“…The difference between the spectra of Ω and Ω in pp collision is described by the processes ( 13),( 15) and ( 14) and the parameters are chosen as η [] = η {} = 0.25. [28,31] For the cascade process a → H(a b) + b in the beam (target) side, the distribution function of light-like fraction of b is assumed as…”

Section: Quark-diquark Cascade Processmentioning

confidence: 99%

“…in p 2 T space, where m H denotes the mass of H. The parameter C is fixed from the experimental data on p 2 T distributions of pions [30]. We use the values of γ = 1.75 and C = 1.8GeV − 3 2 , from previous analyses [30,31].…”

Section: Quark-diquark Cascade Processmentioning

confidence: 99%

“…[28], we used cos 2 θ = 2 3 and P uū = 0.45, P d d = 0.45 and P ss = 0.10. To reproduce the data on π − p → D ± X cross section, we choose cos 2 θ = 1 2 , P cc = 0.0003, P uū = 0.435, P d d = 0.435 and P ss = 0.1297 [31]. The dynamical parameters γ [ ] and γ {} as well as the mixing angle of symmetric and anti-symmetric diquarks in octet baryon is related to the π ± spectra in proton fragmentation region and are chosen as γ [ ] = 1.5 and γ {} = 2.0 [30,31].…”

Section: Quark-diquark Cascade Processmentioning

confidence: 99%

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LEADING EFFECTS IN HADROPRODUCTIONS OF Λ_cAND D FROM CONSTITUENT QUARK–DIQUARK CASCADE PICTURE

Tashiro

Nakariki

Noda

et al. 2004

Int. J. Mod. Phys. A

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We discuss the hadroproductions of Λc,Λc, D andD in the framework of the constituent quarkdiquark cascade model taking into account the valence quark annihilation. The spectra of Λc andΛc in pA, Σ − A and π − A collisions are well explained by the model using the values of parameters used in hadroproductions of D andD. It is shown that the role of valence diquark in the incident baryon is important forD productions as well as for Λc production.

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Charm production asymmetries from heavy-quark recombination

Mehen¹

2004

AIP Conference Proceedings

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Abstract. Charm asymmetries in fixed-target hadroproduction experiments are sensitive to power corrections to the QCD factorization theorem for heavy quark production. A power correction called heavy-quark recombination has recently been proposed to explain these asymmetries. In heavy-quark recombination, a light quark or antiquark participates in a hard scattering which produces a charm-anticharm quark pair. The light quark or antiquark emerges from the scattering with small momentum in the rest frame of the charm quark, and together they hadronize into a charm particle. The cross section for this process can be calculated within perturbative QCD up to an overall normalization. Heavy-quark recombination explains the observed D meson and Λ c asymmetries with a minimal set of universal nonperturbative parameters.In this talk I will discuss asymmetries in the production of charm particles in fixedtarget hadroproduction experiments [1,2,3,4,5]. These asymmetries are much larger than predicted by perturbative QCD calculations, so they are a sensitive probe of nonperturbative aspects of heavy particle production. Asymmetries in the production of light particles such as pions and kaons have also been observed, but the production of particles containing heavy quarks is under better theoretical control. When the mass of the quark is heavier than Λ QCD , as is the case for charm, perturbative QCD can be applied even when the particle is produced without large transverse momentum. In addition, nonperturbative effects can be organized in an expansion in Λ QCD /m c .The differential cross-section for the production of a charm particle, H, in the collision of two hadrons, A and B, is believed to factorize in the following manner [6] Here i, j denote partons, f i/A and f j/B are parton distribution functions, D c→H is the fragmentation function for c hadronizing into H and dσ[ij → cc + X] is a perturbatively calculable short-distance cross section. The ellipsis represents corrections to the factorized form of the cross section that are suppressed by Λ QCD /m c , or possibly Λ QCD /p ⊥ if p ⊥ ≫ m c . †

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Valence quark annihilation and leading charmed meson production in $\pi^- N$ and $K^-N$ collisions

Cited by 4 publications

References 0 publications

D-meson production from recombination in hadronic collisions

D-meson production from recombination in hadronic collisions

LEADING EFFECTS IN HADROPRODUCTIONS OF Λ_cAND D FROM CONSTITUENT QUARK–DIQUARK CASCADE PICTURE

Charm production asymmetries from heavy-quark recombination

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Valence quark annihilation and leading charmed meson production in $\pi^- N$ and $K^-N$ collisions

Cited by 4 publications

References 0 publications

D-meson production from recombination in hadronic collisions

D-meson production from recombination in hadronic collisions

LEADING EFFECTS IN HADROPRODUCTIONS OF ΛcAND D FROM CONSTITUENT QUARK–DIQUARK CASCADE PICTURE

Charm production asymmetries from heavy-quark recombination

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Product

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LEADING EFFECTS IN HADROPRODUCTIONS OF Λ_cAND D FROM CONSTITUENT QUARK–DIQUARK CASCADE PICTURE