Introduction to Introduction to Regge theory and soft Pomer Regge theory and soft Pomer on on K. Itakura (KEK) K. Itakura (KEK) 1st NIC (New Interaction Co 1st NIC (New Interaction Co de) meeting de) meeting May 31th @ ICRR, Kashiwa May 31th @ ICRR, Kashiwa
Introduction to Regge theory and soft Pomeron. K. Itakura (KEK) 1st NIC (New Interaction Code) meeting May 31th @ ICRR, Kashiwa. はじめに : Pomeron は何処に出てくるのか. R.Engel, “ Very High Energy Cosmic Rays and Their Interactions ” Nucl. Phys. B(Proc. Suppl.) 151 (2006) 437. の第 3 章が現状を良くまとめている 以下抜粋 - PowerPoint PPT Presentation
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Introduction to Introduction to Regge theory and soft PomeronRegge theory and soft Pomeron
K. Itakura (KEK)K. Itakura (KEK)
1st NIC (New Interaction Code) meeting 1st NIC (New Interaction Code) meeting
May 31th @ ICRR, KashiwaMay 31th @ ICRR, Kashiwa
はじめに: Pomeron は何処に出てくるのか
R.Engel, “Very High Energy Cosmic Rays and Their Interactions” Nucl. Phys. B(Proc. Suppl.) 151 (2006) 437. の第 3 章が現状を良くまとめてい
る以下抜粋• An analysis of the same data set with different hadronic interaction models c
an lead to a wide range of different results. (…) The largest uncertainty in EAS simulation stems from the unknown characteristics of hadronic multiparticle production.
• Three energy regions: 1. At very low energy (< a few GeV): production and decay of resonances 2. Intermediate energy (<103 GeV): fragmentation of two color strings 3. High energy (>103 GeV): minijet production and multiple parton- parton interaction becomes important• Central assumptions that characterize a model’s high energy extrapolation: 1. Size and energy dependence of the QCD minijet cross section 2. Distribution of partons in transverse space (profile function) 3. Scaling of leading particle distributions or scaling violation 4. Treatment of nuclear effects (semi-superposition model, Gribov-Glauber approximation, increased parton shadowing, etc)
はじめに: Pomeron は何処に出てくるのか
典型的なモデル: QGSJET vs SIBYLL :最初の 2 つの点について大きく異なる2. Parton distributions