Σ Hyperons Production in pp and p-Pb Collisions at LHC with ALICE

IF 0.6 4区 物理与天体物理 Q4 PHYSICS, PARTICLES & FIELDS
A. Borisov
{"title":"Σ Hyperons Production in pp and p-Pb Collisions at LHC with ALICE","authors":"A. Borisov","doi":"10.1134/s1063779624700710","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In addition to <span>\\(\\Lambda \\)</span> hyperons, new data on <span>\\(\\Sigma \\)</span> hyperons production are compared to different Monte-Carlo models and contribute to understand hadron production mechanisms. The first measurements of the transverse momentum (<span>\\({{p}_{{\\text{T}}}}\\)</span>) spectra of <span>\\({{\\Sigma }^{0}}\\)</span> and <span>\\({{\\overline \\Sigma }^{0}}\\)</span> hyperons in pp collisions at <span>\\(\\sqrt s = 7\\)</span> TeV at the LHC are presented. The <span>\\({{\\Sigma }^{0}}\\)</span>(<span>\\({{\\overline \\Sigma }^{0}}\\)</span>) is reconstructed via its electromagnetic decay channel <span>\\(\\Lambda (\\overline \\Lambda ) + \\gamma \\)</span>, while the <span>\\(\\Lambda \\)</span>(<span>\\(\\overline \\Lambda \\)</span>) baryon is detected via its decay into <span>\\(p + {{\\pi }^{ - }}\\)</span> (<span>\\(\\bar {p}\\)</span> + <span>\\({{\\pi }^{ + }}\\)</span>). The low-energy photon is measured via conversion into <span>\\({{e}^{ + }}{{e}^{ - }}\\)</span> pairs in the detector material and in PHOS calorimeter by exploiting the unique capability of the ALICE detector. The complementary results on the first detection of <span>\\({{\\Sigma }^{ + }}\\)</span> and <span>\\({{\\overline \\Sigma }^{ - }}\\)</span> hyperon at the LHC with ALICE are shown in pp collisions at <span>\\(\\sqrt s = 13\\)</span> TeV. The <span>\\({{\\Sigma }^{ + }}\\)</span>(<span>\\({{\\overline \\Sigma }^{ - }}\\)</span>) is reconstructed via its weak decay into <i>p</i><span>\\((\\bar {p}) + {{\\pi }^{0}}\\)</span> with the challenging detection of low-energy photons from <span>\\({{\\pi }^{0}}\\)</span> decay. Also, the first reconstruction of <span>\\({{\\overline \\Sigma }^{ \\pm }} \\to \\bar {n} + {{\\pi }^{ \\pm }}\\)</span> decays and <span>\\({{\\overline \\Sigma }^{ \\pm }}\\)</span> transverse momenta spectra in pp and <i>p</i>-Pb collisions are presented. Antineutron is identified and reconstructed with PHOS by unique signature of the annihilation process.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"59 1","pages":""},"PeriodicalIF":0.6000,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of Particles and Nuclei","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1134/s1063779624700710","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, PARTICLES & FIELDS","Score":null,"Total":0}
引用次数: 0

Abstract

In addition to \(\Lambda \) hyperons, new data on \(\Sigma \) hyperons production are compared to different Monte-Carlo models and contribute to understand hadron production mechanisms. The first measurements of the transverse momentum (\({{p}_{{\text{T}}}}\)) spectra of \({{\Sigma }^{0}}\) and \({{\overline \Sigma }^{0}}\) hyperons in pp collisions at \(\sqrt s = 7\) TeV at the LHC are presented. The \({{\Sigma }^{0}}\)(\({{\overline \Sigma }^{0}}\)) is reconstructed via its electromagnetic decay channel \(\Lambda (\overline \Lambda ) + \gamma \), while the \(\Lambda \)(\(\overline \Lambda \)) baryon is detected via its decay into \(p + {{\pi }^{ - }}\) (\(\bar {p}\) + \({{\pi }^{ + }}\)). The low-energy photon is measured via conversion into \({{e}^{ + }}{{e}^{ - }}\) pairs in the detector material and in PHOS calorimeter by exploiting the unique capability of the ALICE detector. The complementary results on the first detection of \({{\Sigma }^{ + }}\) and \({{\overline \Sigma }^{ - }}\) hyperon at the LHC with ALICE are shown in pp collisions at \(\sqrt s = 13\) TeV. The \({{\Sigma }^{ + }}\)(\({{\overline \Sigma }^{ - }}\)) is reconstructed via its weak decay into p\((\bar {p}) + {{\pi }^{0}}\) with the challenging detection of low-energy photons from \({{\pi }^{0}}\) decay. Also, the first reconstruction of \({{\overline \Sigma }^{ \pm }} \to \bar {n} + {{\pi }^{ \pm }}\) decays and \({{\overline \Sigma }^{ \pm }}\) transverse momenta spectra in pp and p-Pb collisions are presented. Antineutron is identified and reconstructed with PHOS by unique signature of the annihilation process.

Abstract Image

利用 ALICE 在大型强子对撞机的 pp 和 p-Pb 对撞中产生 Σ 超子
摘要 除了({\Lambda \)超子之外,关于({\Sigma \)超子产生的新数据与不同的蒙特卡洛模型进行了比较,有助于理解强子产生机制。本文介绍了在大型强子对撞机上以 \(\sqrt s = 7\)TeV 发生的pp对撞中首次测量到的({{p}_{text{T}}}}\))超子和({{\overline \Sigma }^{0}}})超子的横动量({{p}_{text{T}}}}\)光谱。(\({\overline \Sigma }^{0}}\))是通过其电磁衰变通道\(\Lambda (\overline \Lambda ) + \gamma \)重建的、而重子则通过其衰变为(p + {{\pi }^{ - }}\) (\(\bar {p}\)+({{\pi }^{ + }}\))的途径被探测到。利用 ALICE 探测器的独特能力,通过在探测器材料和 PHOS 热量计中转换成 \({{e}^{ + }}{{e}^{ - }}\) 对来测量低能光子。在 \(\sqrt s = 13\) TeV的pp对撞中,ALICE与大型强子对撞机首次探测到了\({{\Sigma }^{ + }}\) 和\({{\overline \Sigma }^{ - }}\) 超子的互补结果。({\overline\Sigma}^{-}}\)通过其弱衰变重构为p((\bar {p}) + {{\pi}^{0}}\),并挑战性地探测到了\({\pi }^{0}}\)衰变的低能光子。同时,首次重建了pp和p-Pb碰撞中的({{\overline \Sigma }^{ \pm }}\to \bar {n} + {{\pi }^{ \pm }} )衰变和({{\overline \Sigma }^{ \pm }}\ )横坐标矩谱。通过湮灭过程的独特特征,用PHOS识别并重建了反中子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Physics of Particles and Nuclei
Physics of Particles and Nuclei 物理-物理:粒子与场物理
CiteScore
1.00
自引率
0.00%
发文量
116
审稿时长
6-12 weeks
期刊介绍: The journal Fizika Elementarnykh Chastits i Atomnogo Yadr of the Joint Institute for Nuclear Research (JINR, Dubna) was founded by Academician N.N. Bogolyubov in August 1969. The Editors-in-chief of the journal were Academician N.N. Bogolyubov (1970–1992) and Academician A.M. Baldin (1992–2001). Its English translation, Physics of Particles and Nuclei, appears simultaneously with the original Russian-language edition. Published by leading physicists from the JINR member states, as well as by scientists from other countries, review articles in this journal examine problems of elementary particle physics, nuclear physics, condensed matter physics, experimental data processing, accelerators and related instrumentation ecology and radiology.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信