在 CERN COMPASS 實驗組量測190-GeVπ 介子束流所產生Drell-Yan 過程反應截面;Measurement of the differential Drell–Yan cross sections with 190-GeV pion beams in the COMPASS Experiment at CERN

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题名:	在 CERN COMPASS 實驗組量測190-GeVπ 介子束流所產生Drell-Yan 過程反應截面;Measurement of the differential Drell–Yan cross sections with 190-GeV pion beams in the COMPASS Experiment at CERN
作者:	謝佳諭;Hsieh, Chia-Yu
贡献者:	物理學系
关键词:	π介子的部分子動量分布;Drell-Yan碰撞截面積;COMPASS實驗;Pion parton distribution function;Drell-Yan cross-section;COMPASS experiment
日期:	2021-08-23
上传时间:	2021-12-07 12:10:28 (UTC+8)
出版者:	國立中央大學
摘要:	位於歐洲核子研究中心的COMPASS實驗組, 在2015年與2018年利用190十億電子伏特的π介子束碰撞三種物質極化鞍靶,鋁靶,以及鎢靶, 進行Drell-Yan過程的碰撞截面積量測 . 選取不變質量為4.3GV-8.5GeV的雙渺子事件，本論文報告多維度的Drell-Yan碰撞截面積的分析方法和結果，事件分佈在費米變量從-0.1到0.9以及橫向動量0.0到3.6 GeV/c範圍此量測結果將有助於決定π介子的部分子動量分布 COMPASS的實驗量測反應截面和量子色動力學的理論計算有很好的吻合度在橫向動量平均分布方面的量測,COMPASS的實驗組的量測結果也與過去的實驗量測結果有一致性，可以用於決定π介子的內部節構?.;The COMPASS experiment at CERN performed measurements of Drell-Yan process using a 190-GeV negative pion beam scattering off a NH3 target and nuclear alumina and tungsten targets in 2015 and 2018. We present the results of differential cross sections of the dimuon events with the invariant mass between 4.5 and 8.5 GeV in the kinematic regions of x-Feynman from -0.1 to 0.9 and transverse momentum up to 3.6 GeV/c. Our results are valuable input for constraining the parton distribution functions (PDFs) of the pion. The measured differential cross sections are compared with the next-to-leading order QCD calculations with pion PDFs provided by JAM and xFitter groups and a reasonable agreement is observed. The result of the mean square of the transverse momentum versus the center-of-mass energy from COMPASS agrees with the measurements of the other pion-induced Drell-Yan experiments and constrains the intrinsic transverse momentum of pions.
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