Ultrahigh energy predictions of proton-air cross sections from accelerator data: An update

被引：12
|
作者：
Block, M. M. [1 ]
机构：
[1] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
来源：
PHYSICAL REVIEW D | 2011年 / 84卷 / 09期
关键词：
BEHAVIOR;
D O I：
10.1103/PhysRevD.84.091501
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
At root s = 57 +/- 7 TeV, the Pierre Auger Observatory (PAO) measured the p-air inelastic production cross section, sigma(prod)(p-air) = air 475 +/- 22(stat)(-15)(+/- 20) (syst) mb, assuming a proton cosmic ray beam with a 25% helium contamination. From a Glauber calculation, they found the inelastic pp cross section, sigma(inel) = 90 +/- 7(stat)(-11)(+/- 9) (syst) +/- 1.5(Glaub) mb. Our parameterization of (p) over barp and pp total cross sections, sigma(tot), using analyticity constraints and unitarity gives accurate extrapolations to ultrahigh energies, and after using a Glauber calculation, accurate predictions for sigma(p-ai)r(prod). We find (i) a pp total cross section, sigma(tot) 133: 4 +/- 1: 6 mb and (ii) sigma(prod)(p-air) 483 +/- 3 mb, independently determining a 19% helium contamination. Using our 57 TeV value for pp sigma(tot) [ M. M. Block and F. Halzen, arXiv: 1109-2041], we find a pp inelastic cross section, sigma(inel) 92: 9 +/- 1.6 mb, agreeing with POA.
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