Comparison of Proton Momentum Spectra in Proton-Proton Collisions Involving Pion and Kaon Production

Abolins, M.; Smith, Gerald A.; Zhang, Ming; Gellert, Eugene; Wicklund, A. B.

doi:10.1103/physrevlett.25.126

Cited by 42 publications

(7 citation statements)

References 10 publications

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“…From experimental data on the high-energy inclusive pp reactions, it is known that the distribution of x is approximately independent of √ s (called "Feynman scaling" [93,94]). Indeed, various experiments reported that the kinetic energy of the final-state proton K ′ i in the inclusive pion production process has flat distribution (see, for e.g., [95]). Thus, with such experimental result, we estimate the averaged value of x as…”

Section: C21 Inelastic Scattering With Background Protonmentioning

confidence: 99%

Big-bang nucleosynthesis and hadronic decay of long-lived massive particles

2005

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We study the big-bang nucleosynthesis (BBN) with the long-lived exotic particle, called X. If the lifetime of X is longer than ∼ 0.1 sec, its decay may cause nonthermal nuclear reactions during or after the BBN, altering the predictions of the standard BBN scenario. We pay particular attention to its hadronic decay modes and calculate the primordial abundances of the light elements. Using the result, we derive constraints on the primordial abundance of X.Compared to the previous studies, we have improved the following points in our analysis: The JETSET 7.4 Monte Carlo event generator is used to calculate the spectrum of hadrons produced by the decay of X; The evolution of the hadronic shower is studied taking account of the details of the energy-loss processes of the nuclei in the thermal bath; We have used the most recent observational constraints on the primordial abundances of the light elements; In order to estimate the uncertainties, we have performed the Monte Carlo simulation which includes the experimental errors of the cross sections and transfered energies.We will see that the non-thermal productions of D, 3 He, 4 He and 6 Li provide stringent upper bounds on the primordial abundance of late-decaying particle, in particular when the hadronic branching ratio of X is sizable. We apply our results to the gravitino problem, and obtain upper bound on the reheating temperature after inflation.

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Section: C21 Inelastic Scattering With Background Protonmentioning

confidence: 99%

Big-bang nucleosynthesis and hadronic decay of long-lived massive particles

2005

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“…and similarly for the target contribution. It has long been known that, to good approximation, the distribution of outgoing nucleons in a high energy nucleon-nucleon collision is flat in longitudinal momentum or a hyperbolic cosine (symmetric about the CM) in rapidity [11,12]. This knowledge does not uniquely determine the 2-particle kernel K but with the additional, sensible, requirements that the projectile distribution be forward peaked and that the simplest mathematical representation be used consistent with the data, leads to the parametrization…”

Section: Formulation and Solution Of The Modelmentioning

confidence: 99%

Linear extrapolation of ultrarelativistic nucleon-nucleon scattering to nucleus-nucleus collisions

Jeon

Kapusta²

1997

Phys. Rev. C

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We use a Glauber-like approach to describe very energetic nucleus-nucleus collisions as a sequence of binary nucleon-nucleon collisions. No free parameters are needed: all the information comes from simple parametrizations of nucleon-nucleon collision data. Produced mesons are assumed not to interact with each other or with the original baryons. Comparisons are made to published experimental measurements of baryon rapidity and transverse momentum distributions, negative hadron rapidity and transverse momentum distributions, average multiplicities of pions, kaons, hyperons, and antihyperons, and zero degree energy distributions for sulfur-sulfur collisions at 200 GeV/c per nucleon and for lead-lead collisions at 158 GeV/c per nucleon. Good agreement is found except that the number of strange particles produced, especially antihyperons, is too small compared with experiment. We call this model LEXUS: it is a baseline linear extrapolation of ultrarelativistic nucleon-nucleon scattering to heavy ion collisions. †

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“…In our previous work [21] we have fixed N for the monopole related form factor (10) in the interval 1.2-1.3 GeV fitting the forward differential cross section of the reaction pp → da + 0 from [33]. On the other hand, the same data can be described rather well using a dipole form factor (at the vertices) with N = 1.55-1.6 GeV (cf figure 7).…”

Section: The Reaction Nn → Nnamentioning

confidence: 99%

“…This undesirable property is absent in the form factor (10), where we consider the cut-off N as a free parameter. In our previous work [21] we fixed N in the interval 1.2-1.3 GeV using experimental data on the differential cross section of the reaction pp → da + 0 at p lab = 3.8-6.3 GeV/c [33]; in this study we take N = 1.24 GeV as an average value (see also the discussion in section 4).…”

Section: An Effective Lagrangian Approach With One-pion Exchangementioning

confidence: 99%

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Production of a0 mesons in pp and pn reactions

Bratkovskaya

Grishina

Kondratyuk

et al. 2002

J. Phys. G: Nucl. Part. Phys.

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Abstract. We investigate the cross section for the reaction N N → N N a 0 near threshold and at medium energies. An effective Lagrangian approach with one-pion exchange is applied to analyze different contributions to the cross section for different isospin channels. The Reggeon exchange mechanism is also considered. The results are used to calculate the contribution of the a 0 meson to the cross sections and invariant KK mass distributions of the reactions pp → pnK +K 0 and pp → ppK + K − . It is found that the experimental observation of a + 0 mesons in the reaction pp → pnK +K 0 is much more promising than the observation of a 0 0 mesons in the reaction pp → ppK + K − . PACS

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Comparison of Proton Momentum Spectra in Proton-Proton Collisions Involving Pion and Kaon Production

Cited by 42 publications

References 10 publications

Big-bang nucleosynthesis and hadronic decay of long-lived massive particles

Big-bang nucleosynthesis and hadronic decay of long-lived massive particles

Linear extrapolation of ultrarelativistic nucleon-nucleon scattering to nucleus-nucleus collisions

Production of a0 mesons in pp and pn reactions

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