تقرير
Probing QCD approach to thermal equilibrium with ultrahigh energy cosmic rays
| العنوان: | Probing QCD approach to thermal equilibrium with ultrahigh energy cosmic rays |
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| المؤلفون: | Soriano, Jorge F., Anchordoqui, Luis A., Paul, Thomas C., Weiler, Thomas J. |
| المصدر: | PoS ICRC2017 (2018) 342 |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | The Pierre Auger Collaboration has reported an excess in the number of muons of a few tens of percent over expectations computed using extrapolation of hadronic interaction models tuned to accommodate LHC data. Very recently, we proposed an explanation for the muon excess assuming the formation of a deconfined quark matter (fireball) state in central collisions of ultrarelativistic cosmic rays with air nuclei. At the first stage of its evolution the fireball contains gluons as well as $u$ and $d$ quarks. The very high baryochemical potential inhibits gluons from fragmenting into $u \bar u$ and $d \bar d$, and so they fragment predominantly into $s \bar s$ pairs. In the hadronization which follows this leads to the strong suppression of pions and hence photons, but allows heavy hadrons to be emitted carrying away strangeness. In this manner, the extreme imbalance of hadron to photon content provides a way to enhance the muon content of the air shower. In this communication we study theoretical systematics from hadronic interaction models used to describe the cascades of secondary particles produced in the fireball explosion. We study the predictions of one of the leading LHC-tuned models QGSJET II-04 considered in the Auger analysis. Comment: 7 pages LaTeX, 6 .pdf figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.22323/1.301.0342 |
| URL الوصول: | http://arxiv.org/abs/1811.07728 |
| رقم الأكسشن: | edsarx.1811.07728 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.22323/1.301.0342 |
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