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arXiv 0909.0292hep-ex
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y=0和sqrt(s)=1.8 TeV时p-pbar碰撞中低质量粒子初级截面的简单行为

Simple Behavior of Primary Cross Sections for Low Mass Particles in p-pbar Collisions at y=0 and sqrt(s)=1.8 TeV

T. Alexopoulos, E. W. Anderson, D. D. Carmony, A. R. Erwin, C. Findeisen, K. Gulbrandsen, L. J. Gutay, A. S. Hirsch, C. Hojvat, J. R. Jennings, C. Loomis, J. M … 展开作者

T. Alexopoulos, E. W. Anderson, D. D. Carmony, A. R. Erwin, C. Findeisen, K. Gulbrandsen, L. J. Gutay, A. S. Hirsch, C. Hojvat, J. R. Jennings, C. Loomis, J. M LoSecco, K. S. Nelson, S. H. Oh, N. T. Porile, R. P. Scharenberg, F. Turkot, W. D. Walker, C. H. Wang, J. Warchol

摘要:

本文给出了质心能sqrt(s)=1.8 TeV时p-pbar相互作用的零快度包容截面。六个粒子截面进行了校正,从更高的质量共振衰变的二次贡献,以产生一组主要的截面。每个自旋态的初级截面可用d(sigma^p)/dy来描述|_(y=0)= 0.721*(pi* λ dabar_(pi)^2)*exp(-m/T),其中m为粒子静止质量,T=hbar*c/r_h,r_h=0.97 fm。如果r_h被r_A=r_h*A^(1/3)代替,则氘产生截面也被描述。m和T中的相同指数描述了e+e碰撞中的主要魅力分数,至少达到J/Psi质量。如果只考虑轻强子的初级产生,则没有显著的奇异性或粲抑制的证据。有证据表明,对于pp和pbar-p碰撞,每个粒子的初级截面可能具有相同的值,并且它可能在sqrt(s)=63 GeV和sqrt(s)=1800 GeV之间具有几乎恒定的值。适合于最终状态的横向动量的粒子使用气体模型有利于温度T=132 MeV,化学势μ =129 MeV,和横向流动的气体与β_f=0.27。

英文摘要:

A set of inclusive cross sections at zero rapidity is presented for p-pbar interactions at center of mass energy sqrt(s)=1.8 TeV. Six particle cross sections are corrected for secondary contributions from decays of higher mass resonances in order to produce a set of primary cross sections. The primary cross sections per spin state are well described by d(sigma^p)/dy|_(y=0)= 0.721*(pi*lambdabar_(pi)^2)*exp(-m/T), where m is the particle rest mass, T=hbar*c/r_h, and r_h=0.97 fm. The deuterium production cross section is also described if r_h is replaced by r_A=r_h*A^(1/3). The same exponential in m and T describes primary charm fractions in e+e- collisions at least up to the J/Psi mass. There is no significant evidence for strangeness or charm suppression if only primary production of light hadrons is considered. There is evidence that the primary cross section for each particle may have the same value for pp and pbar-p collisions and that it may have nearly constant values between sqrt(s)=63 GeV and sqrt(s)=1800 GeV. Fits to the final state transverse momenta of the particles using a gas model favor a temperature T=132 MeV, a chemical potential mu=129 MeV, and a transverse flow of the gas with beta_f=0.27.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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