Meson and Baryon Productions in K+ and  + Beam Jets and Quark-Diquark Cascade Model

Kinoshita, Kisei; Noda, Hidetoshi; Tashiro, Tsutomu

doi:10.1143/ptp.68.1699

Cited by 9 publications

(11 citation statements)

References 5 publications

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“…An accurate study requires a detailed event generator, like the Lund Monte Carlo program (Andersson, Gustafson, Ingelman, and Sjostrand, 1982;; see also Andersson et aly 1977, and the review by Andersson, 1991). Both within this model, which has no particular preexisting diquarks inside nucleons, and in other schemes (see, e.g., Kinoshita et al, 1982aKinoshita et al, , 1982b, one finds that the fragmentation functions for diquarks->baryons are different from those for quarks -•mesons. The leading baryon in the first process is, on the average, more energetic than the leading meson in the second.…”

Section: Diquark Fragmentationmentioning

confidence: 75%

“…Diquarks as single entities appear also in the framework of quark-diquark cascade models to explain small-/? T hadronic production in highenergy interactions (Kinoshita et al, 1980(Kinoshita et al, , 1982a(Kinoshita et al, , 1982bMisra et al, 1982;Tashiro et al, 1987) and in a preasymptotic mechanism for nucleon-antinucleon annihilation (Zakharov and Kopeliovich, 1989). Diquarks, in quark-diquark fragmentation chains or quark-diquark fusion or recombination schemes, are often introduced in the description of the hadronic production of baryons, in particular hyperons (see Donnachie, 1980;Fisjak and Kistenev, 1981;Cooke, 1984;and, essentially, all Monte Carlo-based schemes).…”

Section: Soft Hadronic Processesmentioning

confidence: 99%

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Diquarks

et al. 1993

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It is becoming increasingly clear that the concept of a diquark (a two-quark system) is important for understanding hadron structure and high-energy particle reactions. According to our present knowledge of quantum chromodynamics (QCD), diquark correlations arise in part from spin-dependent interactions between two quarks, from quark radial or orbital excitations, and from quark mass differences. Diquark substructures affect the static properties of baryons and the mechanisms of baryon decay. Diquarks also play a role in hadron production in hadron-initiated reactions, deep-inelastic lepton scattering by hadrons, and in e + e~ reactions. Diquarks are important in the formation and properties of baryonium and mesonlike semistable states. Many spin effects observed in high-energy exclusive reactions pose severe problems for the pure quark picture of baryons and might be explained by the introduction of diquarks as hadronic constituents. There is considerable controversy, not about the existence of diquarks in hadrons, but about their properties and their effects. In this work a broad selection of the main ideas about diquarks is reviewed.

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Section: Diquark Fragmentationmentioning

confidence: 75%

Section: Soft Hadronic Processesmentioning

confidence: 99%

Diquarks

et al. 1993

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“…The parameter ǫ is the probability of baryon productions from a quark and is related to the baryon productions from π and K beams resulting in ǫ = 0.07. [28] The processes (13) and (15) contribute to production of baryons which share no valence quark or diquark in common with the incident hadron. Although both Ω andΩ share no valence quark common with the incident proton, the spectrum of Ω is harder than that ofΩ in the proton fragmentation region.…”

Section: Quark-diquark Cascade Processmentioning

confidence: 99%

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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“…9). These· equations are very complicated and it is difficult to solve them analytically except for special cases.…”

Section: Emission Functionmentioning

confidence: 99%

“…1. 8 ), 9) Different treatments of the diquark jets have been discussed by Anderson et al IO In this paper we investigate hadron productions in neutrino (lI) and antineutrino (iJ) proton scatterings on the basis of the assumption of a quark -diquark structure of proton and a quark-diquark cascade model. A main problem in these scatterings is whether the diquark system*) in target fragmentation region behaves like a single object or two-quark configuration.…”

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confidence: 99%

Target Fragmentations in p and Formulap Interactions and Quark-Diquark Structure of Proton

Noda¹,

Tashiro

1985

Progress of Theoretical Physics

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The target fragmentations in vp and fjp interactions are investigated by the assumption of a quark· diquark structure of proton and a quark·diquark cascade model. It is shown that the diquark system left in target fragmentation region behaves like a mixing state of single object mode (diquark) and independent two·quark mode. § 1. IntroductionThe idea of a diquark state in proton is an interesting problem, which has been investigated in many physical processes. 1) Recently, the role of diquarks in deep-inelastic lepton-nucleon scattering has been studied by an assumption that diquark form factors can account for the scaling violation in nucleon structure functions. 2 ) In particular, Fredriksson et al. showed that the proton is mostly in a u( ud)o configuration where (ud)o denotes diquark with 5=1=0. Also, the proton fragmentation at small PT has been systematically studied on the basis of the assumption of a quark-diquark structure of proton. 3 ),4)In these analyses, the diquark is assumed to be a colored entity(3* of color) which becomes part of a baryon.On the other hand, the cascade model for quark jets in soft and hard interactions has been discussed by many authors. 5) The model, however, did not include baryon and antibaryon productions. Recent experimental data in e+ e-annihilations have shown that many baryons are produced. 6 ),7) Thus, we must consider a quark jet including baryon and antibaryon productions. It is a simple treatment of baryon productions in quark jets to consider a diquark-antidiquark pair creation in a way similar to the quark-antiquark pair creation. Hence, we may consider a cascade of the diquark similar to the quark. These considerations lead to a multi-channel cascade model for quark and diquark where the primordial emission processes of quark (q) and diquark «qq» are shown in Fig. 1. 8 ),9) Different treatments of the diquark jets have been discussed by Anderson et al. IO ) and q '" q • (qq) =;;;;z:t ==;~>C=. B (qq) ~M C q ~(qq) (e) (d) Fig. 1. Primordial emission processes of quark and diquark:(a) q-->meson(M)+q, (b) q-->baryon(B) +(qq), (c) (qq)-->B+ii and (d) (qq)-->M+(qq).

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Meson and Baryon Productions in K+ and + Beam Jets and Quark-Diquark Cascade Model

Cited by 9 publications

References 5 publications

Diquarks

Diquarks

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

Target Fragmentations in p and Formulap Interactions and Quark-Diquark Structure of Proton

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Meson and Baryon Productions in K+ and + Beam Jets and Quark-Diquark Cascade Model

Cited by 9 publications

References 5 publications

Diquarks

Diquarks

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

Target Fragmentations in p and Formulap Interactions and Quark-Diquark Structure of Proton

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