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In physics, the underlying event (UE) is all what is seen in a hadron collider event which is not coming from the primary hard scattering (high energy, high momentum impact) process.〔(【引用サイトリンク】title=Underlying Event – a definitive study by CDF - Collider Blog )〕 It was first defined in 2002.〔arxiv.org/pdf/1101.4155v1.pdf〕〔A. A. Affolderet al.(Collaboration ), Phys. Rev.D65, 092002 (2002).〕 ==Further explanation== Underlying events can be thought of as the remnants of scattering interactions.〔http://www2.ph.ed.ac.uk/~vjm/Lectures/SH_IM_Particle_Physics_2013_files/Jets-Lecture10.pdf〕〔 The UE may involve contributions from both "hard" and "soft" processes (here “soft” refers to interactions with low p-T, i.e. transverse momentum, transfer〔http://arxiv.org/pdf/1012.0791v2.pdf〕). These are important both in the simulation of particle experiments (often using event generators); and interpretation and analysis of data so as to filter out the desired signals.〔http://www.hep.ucl.ac.uk/~jmb/Talks/dresden2005.pdf〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Underlying event」の詳細全文を読む スポンサード リンク
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