CINXE.COM

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">     <html xmlns="http://www.w3.org/1999/xhtml" lang="ja" xml:lang="ja" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>Study of $\Xi$-Hadron Correlations in pp Collisions at $\sqrt{s}=13$ TeV Using the ALICE Detector - CERN Document Server</title> <link href='https://framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css' rel='stylesheet' type='text/css' /> <link rel="stylesheet" href="http://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="http://cds.cern.ch/img/cern_theme/css/cern_theme.css?v=20141127" type="text/css" /> <link rel="stylesheet"href="/css/font-awesome.min.css"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"/> <link rel="stylesheet" href="http://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="http://cds.cern.ch/record/2750097" /> <link rel="alternate" hreflang="el" href="http://cds.cern.ch/record/2750097?ln=el" /> <link rel="alternate" hreflang="fr" href="http://cds.cern.ch/record/2750097?ln=fr" /> <link rel="alternate" hreflang="bg" href="http://cds.cern.ch/record/2750097?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="http://cds.cern.ch/record/2750097?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="http://cds.cern.ch/record/2750097?ln=pt" /> <link rel="alternate" hreflang="no" href="http://cds.cern.ch/record/2750097?ln=no" /> <link rel="alternate" hreflang="hr" href="http://cds.cern.ch/record/2750097?ln=hr" /> <link rel="alternate" hreflang="ca" href="http://cds.cern.ch/record/2750097?ln=ca" /> <link rel="alternate" hreflang="de" href="http://cds.cern.ch/record/2750097?ln=de" /> <link rel="alternate" hreflang="it" href="http://cds.cern.ch/record/2750097?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="http://cds.cern.ch/record/2750097?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="http://cds.cern.ch/record/2750097?ln=sv" /> <link rel="alternate" hreflang="sk" href="http://cds.cern.ch/record/2750097?ln=sk" /> <link rel="alternate" hreflang="en" href="http://cds.cern.ch/record/2750097?ln=en" /> <link rel="alternate" hreflang="pl" href="http://cds.cern.ch/record/2750097?ln=pl" /> <link rel="alternate" hreflang="ru" href="http://cds.cern.ch/record/2750097?ln=ru" /> <link rel="alternate" hreflang="ka" href="http://cds.cern.ch/record/2750097?ln=ka" /> <link rel="alternate" hreflang="ja" href="http://cds.cern.ch/record/2750097?ln=ja" /> <link rel="alternate" hreflang="es" href="http://cds.cern.ch/record/2750097?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=ja" /> <link rel="search" type="application/opensearchdescription+xml" href="http://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="http://cds.cern.ch/unapi" /> <link rel="apple-touch-icon" href="/apple-touch-icon.png"/> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png"/> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="ja" /> <meta name="description" content="By colliding heavy nuclei at high energies, which is done at RHIC and the LHC, a strongly interacting Quark Gluon Plasma (QGP) is created. This manifests itself through several different signatures, which until recently was thought to uniquely probe the QGP. Recently, however, similar signatures have been observed also in small systems, such as pp collisions with high charged-particle multiplicity, which is quite puzzling since a QGP is not expected to be formed in such dilute systems with short lifetimes. One such observable is the enhanced relative yields of multistrange baryons, such as the $\Xi$ baryon, which has been observed in e.g. Pb-Pb collisions. More recently, this yield enhancement has been observed to scale smoothly with multiplicity also in pp collisions. The main analysis presented in this thesis aims at understanding the production mechanism of strange quarks in pp collisions at $\sqrt{s}=13\,\mathrm{TeV}$, and in this way reach an explanation of the origin of the strangeness enhancement observed there. This is done by studying angular $\Xi-h$ correlations, where $h$ is either of $\pi$, K, p, $\Lambda$, or $\Xi$ hadrons, by using data from the ALICE detector. The results are compared with four phenomenological models; three flavours of the QCD inspired PYTHIA8 which is based on colour strings, and the core-corona model EPOS LHC. The PYTHIA tunes are the Monash tune, the Junction Mode 0 tune, which has an additional mechanism for baryon formation, and a yet unofficial tune including rope hadronisation, which is a proposed mechanism for the observed strangeness enhancement. In EPOS, the enhanced strangeness is modelled by an increasing fraction of a core that behaves like a medium. The results show that the $\Xi-\pi$ correlation function is dominated by a narrow near-side peak. This is not present in any of the other correlations, which on the other hand have a wide extension in rapidity. This means that pions decouple later in the evolution from the $\Xi$ baryon compared to the other species, likely within the jet, which was concluded to be due to charge balance, whereas the other correlations are attributed to strangeness and baryon decoupling. In all PYTHIA flavours, strong correlations within the jet are present for all combinations except $\Xi-\rm p$ correlations, meaning that strangeness and baryon number are produced earlier in the evolution in data than in PYTHIA. The junction model however gave a description of the $\Xi-$baryon correlation that was closer to data than the Monash tune, indicating that the additional baryon mechanism included there is more likely to be correct. For EPOS, on the other hand, the correlation function is very dilute for most species, which was concluded to be due to local conservation of quantum numbers not being properly accounted for. Therefore, it is not yet possible to use this measurement to test the underlying mechanism provided by this model. Based on this, the observations in data indicate that the strangeness production mechanism is likely either due to a core-corona like state, or some hybrid mechanism where string interactions are also important. Correlations were also measured as a function of multiplicity, yielding very similar results across multiplicity classes. Therefore it was concluded that the strangeness and baryon production mechanisms in pp collisions are likely the same regardless of multiplicity. Adolfsson, Jonatan" /> <meta name="keywords" content="CERN Document Server, WebSearch, ALICE Preprints" /> <script type="text/javascript" src="http://cds.cern.ch/js/jquery.min.js"></script>  <link rel="stylesheet" href="http://cds.cern.ch/img/webnews.css" type="text/css" />  <script type="text/javascript" src="http://cds.cern.ch/js/webnews.js?v=20131009"></script> <meta property="fb:app_id" content="137353533001720"/> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ tex2jax: {inlineMath: [['$','$']], processEscapes: true}, showProcessingMessages: false, messageStyle: "none" }); </script> <script src="/MathJax/MathJax.js?config=TeX-AMS_CHTML" type="text/javascript"> </script>  <meta content="Study of $\Xi$-Hadron Correlations in pp Collisions at $\sqrt{s}=13$ TeV Using the ALICE Detector" name="citation_title" /> <meta content="Adolfsson, Jonatan" name="citation_author" /> <meta content="Lund University Publications" name="citation_publisher" /> <meta content="2020" name="citation_publication_date" /> <meta name="citation_online_date" content="2021/01/22"> <meta content="CERN-THESIS-2020-265" name="citation_technical_report_number" /> <meta content="Lund U." name="citation_dissertation_institution" /> <meta name="citation_pdf_url" content="http://cds.cern.ch/record/2750097/files/CERN-THESIS-2020-265.pdf" />  <meta content="Study of $\Xi$-Hadron Correlations in pp Collisions at $\sqrt{s}=13$ TeV Using the ALICE Detector" property="og:title" /> <meta content="website" property="og:type" /> <meta content="http://cds.cern.ch/record/2750097" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="By colliding heavy nuclei at high energies, which is done at RHIC and the LHC, a strongly interacting Quark Gluon Plasma (QGP) is created. This manifests itself through several different signatures, which until recently was thought to uniquely probe the QGP. Recently, however, similar signatures have been observed also in small systems, such as pp collisions with high charged-particle multiplicity, which is quite puzzling since a QGP is not expected to be formed in such dilute systems with short lifetimes. One such observable is the enhanced relative yields of multistrange baryons, such as the $\Xi$ baryon, which has been observed in e.g. Pb-Pb collisions. More recently, this yield enhancement has been observed to scale smoothly with multiplicity also in pp collisions. The main analysis presented in this thesis aims at understanding the production mechanism of strange quarks in pp collisions at $\sqrt{s}=13\,\mathrm{TeV}$, and in this way reach an explanation of the origin of the strangeness enhancement observed there. This is done by studying angular $\Xi-h$ correlations, where $h$ is either of $\pi$, K, p, $\Lambda$, or $\Xi$ hadrons, by using data from the ALICE detector. The results are compared with four phenomenological models; three flavours of the QCD inspired PYTHIA8 which is based on colour strings, and the core-corona model EPOS LHC. The PYTHIA tunes are the Monash tune, the Junction Mode 0 tune, which has an additional mechanism for baryon formation, and a yet unofficial tune including rope hadronisation, which is a proposed mechanism for the observed strangeness enhancement. In EPOS, the enhanced strangeness is modelled by an increasing fraction of a core that behaves like a medium. The results show that the $\Xi-\pi$ correlation function is dominated by a narrow near-side peak. This is not present in any of the other correlations, which on the other hand have a wide extension in rapidity. This means that pions decouple later in the evolution from the $\Xi$ baryon compared to the other species, likely within the jet, which was concluded to be due to charge balance, whereas the other correlations are attributed to strangeness and baryon decoupling. In all PYTHIA flavours, strong correlations within the jet are present for all combinations except $\Xi-\rm p$ correlations, meaning that strangeness and baryon number are produced earlier in the evolution in data than in PYTHIA. The junction model however gave a description of the $\Xi-$baryon correlation that was closer to data than the Monash tune, indicating that the additional baryon mechanism included there is more likely to be correct. For EPOS, on the other hand, the correlation function is very dilute for most species, which was concluded to be due to local conservation of quantum numbers not being properly accounted for. Therefore, it is not yet possible to use this measurement to test the underlying mechanism provided by this model. Based on this, the observations in data indicate that the strangeness production mechanism is likely either due to a core-corona like state, or some hybrid mechanism where string interactions are also important. Correlations were also measured as a function of multiplicity, yielding very similar results across multiplicity classes. Therefore it was concluded that the strangeness and baryon production mechanisms in pp collisions are likely the same regardless of multiplicity." property="og:description" />  <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="ALICE32Preprints search" lang="ja">  <div id="cern-toolbar"> <h1><a href="http://cern.ch" title="CERN">CERN <span>Accelerating science</span></a></h1> <ul> <li class="cern-accountlinks"><a class="cern-account" href="https://cds.cern.ch/youraccount/login?ln=ja&referer=http%3A//cds.cern.ch/record/2750097%3Fln%3Dja" title="Sign in to your CERN account">Sign in</a></li> <li><a class="cern-directory" href="http://cern.ch/directory" title="Search CERN resources and browse the directory">Directory</a></li> </ul> </div>   <div role="banner" class="clearfix" id="header"> <div class="header-inner inner"> <hgroup class="clearfix"> <h2 id="site-name"> <a rel="home" title="Home" href="/"><span>CERN Document Server</span></a> </h2> <h3 id="site-slogan">Access articles, reports and multimedia content in HEP</h3> </hgroup> <div role="navigation" id="main-navigation" class="cdsmenu"> <h2 class="element-invisible">Main menu</h2><ul class="links inline clearfix"> <li class="menu-386 first active-trail"><a class="active-trail" href="http://cds.cern.ch/?ln=ja">検索</a></li> <li class="menu-444 "><a class="" title="" href="http://cds.cern.ch/submit?ln=ja">アップロード</a></li> <li class="menu-426 "><a class="" href="http://cds.cern.ch/help/?ln=ja">ヘルプ</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=ja">あなたのページ</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=ja">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=ja">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=ja">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=ja">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=ja" class="navtrail">ホーム</a> > <a href="/collection/CERN%20Experiments?ln=ja" class="navtrail">CERN Experiments</a> > <a href="/collection/LHC%20Experiments?ln=ja" class="navtrail">LHC Experiments</a> > <a href="/collection/ALICE?ln=ja" class="navtrail">ALICE</a> > <a href="/collection/ALICE%20Preprints?ln=ja" class="navtrail">ALICE Preprints</a> > Study of $\Xi$-Hadron Correlations in pp Collisions at $\sqrt{s}=13$ TeV Using the ALICE Detector </td> </tr> </table> </div> <div class="pagebody"><div class="pagebodystripemiddle"> <div class="detailedrecordbox"> <div class="detailedrecordtabs"> <div> <ul class="detailedrecordtabs"><li class="on first"><a href="/record/2750097/?ln=ja">Information </a></li><li class=""><a href="/record/2750097/comments?ln=ja">Discussion (0) </a></li><li class=""><a href="/record/2750097/files?ln=ja">Files </a></li></ul> <div id="tabsSpacer" style="clear:both;height:0px"> </div></div> </div> <div class="detailedrecordboxcontent"> <div class="top-left-folded"></div> <div class="top-right-folded"></div> <div class="inside">  <abbr class="unapi-id" title="2750097"></abbr> <style type="text/css">  </style> <script type="text/javascript" src="/js/pdf-previewer-append-to-table.js"></script> <table class="formatRecordTableFullWidth" > <tr> <td class="formatRecordHeader" style="background-image: url('https://cds.cern.ch/img/journals.jpg');" colspan="2"> Thesis </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;">CERN-THESIS-2020-265</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Study of $\Xi$-Hadron Correlations in pp Collisions at $\sqrt{s}=13$ TeV Using the ALICE Detector</b></td></tr> <tr><td class="formatRecordLabel"><span style="white-space:nowrap;">Author(s)</span> </td><td style="padding-left:5px;"><a href="http://cds.cern.ch/search?f=author&p=Adolfsson%2C%20Jonatan&ln=ja">Adolfsson, Jonatan</a> (Lund U.)</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">Lund, Sweden : Lund University Publications, 2020 - 257.</td></tr> <tr><td class="formatRecordLabel"> Thesis note </td><td style="padding-left:5px;">PhD : Lund U. : 2020</td></tr> <tr><td class="formatRecordLabel"> Thesis supervisor(s) </td><td style="padding-left:5px;"><a href="/search?f=author&p=Silvermyr, David">Silvermyr, David</a> ; <a href="/search?f=author&p=Christiansen, Peter">Christiansen, Peter</a> ; <a href="/search?f=author&p=Oskarsson, Anders">Oskarsson, Anders</a> ; <a href="/search?f=author&p=Ohlson, Alice">Ohlson, Alice</a></td></tr> <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">Presented 11 Dec 2020</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Particle Physics - Experiment</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="http://cds.cern.ch/search?p=CERN%20LHC&f=693__a">CERN LHC</a> ; <a href="http://cds.cern.ch/search?p=ALICE&f=693__e">ALICE</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">By colliding heavy nuclei at high energies, which is done at RHIC and the LHC, a strongly interacting Quark Gluon Plasma (QGP) is created. This manifests itself through several different signatures, which until recently was thought to uniquely probe the QGP. Recently, however, similar signatures have been observed also in small systems, such as pp collisions with high charged-particle multiplicity, which is quite puzzling since a QGP is not expected to be formed in such dilute systems with short lifetimes. One such observable is the enhanced relative yields of multistrange baryons, such as the $\Xi$ baryon, which has been observed in e.g. Pb-Pb collisions. More recently, this yield enhancement has been observed to scale smoothly with multiplicity also in pp collisions. The main analysis presented in this thesis aims at understanding the production mechanism of strange quarks in pp collisions at $\sqrt{s}=13\,\mathrm{TeV}$, and in this way reach an explanation of the origin of the strangeness enhancement observed there. This is done by studying angular $\Xi-h$ correlations, where $h$ is either of $\pi$, K, p, $\Lambda$, or $\Xi$ hadrons, by using data from the ALICE detector. The results are compared with four phenomenological models; three flavours of the QCD inspired PYTHIA8 which is based on colour strings, and the core-corona model EPOS LHC. The PYTHIA tunes are the Monash tune, the Junction Mode 0 tune, which has an additional mechanism for baryon formation, and a yet unofficial tune including rope hadronisation, which is a proposed mechanism for the observed strangeness enhancement. In EPOS, the enhanced strangeness is modelled by an increasing fraction of a core that behaves like a medium. The results show that the $\Xi-\pi$ correlation function is dominated by a narrow near-side peak. This is not present in any of the other correlations, which on the other hand have a wide extension in rapidity. This means that pions decouple later in the evolution from the $\Xi$ baryon compared to the other species, likely within the jet, which was concluded to be due to charge balance, whereas the other correlations are attributed to strangeness and baryon decoupling. In all PYTHIA flavours, strong correlations within the jet are present for all combinations except $\Xi-\rm p$ correlations, meaning that strangeness and baryon number are produced earlier in the evolution in data than in PYTHIA. The junction model however gave a description of the $\Xi-$baryon correlation that was closer to data than the Monash tune, indicating that the additional baryon mechanism included there is more likely to be correct. For EPOS, on the other hand, the correlation function is very dilute for most species, which was concluded to be due to local conservation of quantum numbers not being properly accounted for. Therefore, it is not yet possible to use this measurement to test the underlying mechanism provided by this model. Based on this, the observations in data indicate that the strangeness production mechanism is likely either due to a core-corona like state, or some hybrid mechanism where string interactions are also important. Correlations were also measured as a function of multiplicity, yielding very similar results across multiplicity classes. Therefore it was concluded that the strangeness and baryon production mechanisms in pp collisions are likely the same regardless of multiplicity.</td></tr> </table> <br/>Email contact: <a href="mailto:jonatan.adolfsson@hep.lu.se">jonatan.adolfsson@hep.lu.se</a> <small> </small> <small> </small> <br/><br/><div align="right"><div style="padding-bottom:2px;padding-top:30px;"><span class="moreinfo" style="margin-right:10px;"> <a href="" class="moreinfo">Back to search</a> </span></div></div> <div class="bottom-left-folded"><div class="recordlastmodifiedbox" style="position:relative;margin-left:1px"> レコード　生成： 2021-01-22, 最終変更： 2022-01-23</div></div> <div class="bottom-right-folded" style="text-align:right;padding-bottom:2px;"> <span class="moreinfo" style="margin-right:10px;"></span></div> </div> </div> </div> <br/> <br /> <div class="detailedrecordminipanel"> <div class="top-left"></div><div class="top-right"></div> <div class="inside"> <div id="detailedrecordminipanelfile" style="width:33%;float:left;text-align:center;margin-top:0"> <div><small class="detailedRecordActions">フルテキスト:</small> <br /><a href="/record/2750097/files/CERN-THESIS-2020-265.pdf"><img style="border:none" src="/img/file-icon-text-34x48.gif" alt="Download fulltext" /><br />PDF</a><br /></div> </div> <div id="detailedrecordminipanelreview" style="width:30%;float:left;text-align:center"> </div> <div id="detailedrecordminipanelactions" style="width:36%;float:right;text-align:right;"> <ul class="detailedrecordactions"> <li><a href="/yourbaskets/add?ln=ja&recid=2750097">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2750097/export/hx?ln=ja">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2750097/export/hm?ln=ja">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2750097/export/xm?ln=ja">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2750097/export/xd?ln=ja">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2750097/export/xe?ln=ja">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2750097/export/xn?ln=ja">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2750097/export/xw?ln=ja">RefWorks</a> </li> </ul> <div style='padding-left: 13px;'>  <div id="bookmark"></div> <div id="bookmark_sciencewise"></div> <style type="text/css"> #bookmark_sciencewise, #bookmark {float: left;} #bookmark_sciencewise li {padding: 2px; width: 25px;} #bookmark_sciencewise ul, #bookmark ul {list-style-image: none;} </style> <script type="text/javascript" src="/js/jquery.bookmark.min.js"></script> <style type="text/css">@import "/css/jquery.bookmark.css";</style> <script type="text/javascript">// <![CDATA[ $.bookmark.addSite('sciencewise', 'ScienceWise.info', 'http://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/cds:2750097/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'http://cds.cern.ch/record/2750097', addEmail: true, title: "Study of $\\Xi$-Hadron Correlations in pp Collisions at $\\sqrt{s}=13$ TeV Using the ALICE Detector", description: "By colliding heavy nuclei at high energies, which is done at RHIC and the LHC, a strongly interacting Quark Gluon Plasma (QGP) is created. This manifests itself through several different signatures, which until recently was thought to uniquely probe the QGP. Recently, however, similar signatures have been observed also in small systems, such as pp collisions with high charged-particle multiplicity, which is quite puzzling since a QGP is not expected to be formed in such dilute systems with short lifetimes. One such observable is the enhanced relative yields of multistrange baryons, such as the $\\Xi$ baryon, which has been observed in e.g. Pb-Pb collisions. More recently, this yield enhancement has been observed to scale smoothly with multiplicity also in pp collisions. The main analysis presented in this thesis aims at understanding the production mechanism of strange quarks in pp collisions at $\\sqrt{s}=13\\,\\mathrm{TeV}$, and in this way reach an explanation of the origin of the strangeness enhancement observed there. This is done by studying angular $\\Xi-h$ correlations, where $h$ is either of $\\pi$, K, p, $\\Lambda$, or $\\Xi$ hadrons, by using data from the ALICE detector. The results are compared with four phenomenological models; three flavours of the QCD inspired PYTHIA8 which is based on colour strings, and the core-corona model EPOS LHC. The PYTHIA tunes are the Monash tune, the Junction Mode 0 tune, which has an additional mechanism for baryon formation, and a yet unofficial tune including rope hadronisation, which is a proposed mechanism for the observed strangeness enhancement. In EPOS, the enhanced strangeness is modelled by an increasing fraction of a core that behaves like a medium. The results show that the $\\Xi-\\pi$ correlation function is dominated by a narrow near-side peak. This is not present in any of the other correlations, which on the other hand have a wide extension in rapidity. This means that pions decouple later in the evolution from the $\\Xi$ baryon compared to the other species, likely within the jet, which was concluded to be due to charge balance, whereas the other correlations are attributed to strangeness and baryon decoupling. In all PYTHIA flavours, strong correlations within the jet are present for all combinations except $\\Xi-\\rm p$ correlations, meaning that strangeness and baryon number are produced earlier in the evolution in data than in PYTHIA. The junction model however gave a description of the $\\Xi-$baryon correlation that was closer to data than the Monash tune, indicating that the additional baryon mechanism included there is more likely to be correct. For EPOS, on the other hand, the correlation function is very dilute for most species, which was concluded to be due to local conservation of quantum numbers not being properly accounted for. Therefore, it is not yet possible to use this measurement to test the underlying mechanism provided by this model. Based on this, the observations in data indicate that the strangeness production mechanism is likely either due to a core-corona like state, or some hybrid mechanism where string interactions are also important. Correlations were also measured as a function of multiplicity, yielding very similar results across multiplicity classes. Therefore it was concluded that the strangeness and baryon production mechanisms in pp collisions are likely the same regardless of multiplicity." }); // ]]> </script>  </div> </div> <div style="clear:both;margin-bottom: 0;"></div> </div> <div class="bottom-left"></div><div class="bottom-right"></div> </div> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="http://cds.cern.ch/?ln=ja">検索</a> :: <a class="footer" href="http://cds.cern.ch/submit?ln=ja">アップロード</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=ja">あなたのページ</a> :: <a class="footer" href="http://cds.cern.ch/help/?ln=ja">ヘルプ</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> :: <a class="footer" href="https://repository.cern/content-policy" target="_blank">Content Policy</a> :: <a class="footer" href="https://repository.cern/terms" target="_blank">Terms and Conditions</a> <br /> Powered by <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> 管理者 <a class="footer" href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Service</a> - Need help? Contact <a href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Support</a>. <br /> </div> <div class="pagefooterstriperight"> <div class="cern-logo"> <a id="logo" href="http://cern.ch" title="CERN" rel="CERN" ><img src="http://cds.cern.ch/img/cern_theme/img/cern-logo-large.png" alt="CERN" /></a> </div> <div class="cern-languagebox"> この場所は次の言語でまた利用できる:<br /><a href="/record/2750097?ln=bg" class="langinfo">Български</a>  <a href="/record/2750097?ln=ca" class="langinfo">Català</a>  <a href="/record/2750097?ln=de" class="langinfo">Deutsch</a>  <a href="/record/2750097?ln=el" class="langinfo">Ελληνικά</a>  <a href="/record/2750097?ln=en" class="langinfo">English</a>  <a href="/record/2750097?ln=es" class="langinfo">Español</a>  <a href="/record/2750097?ln=fr" class="langinfo">Français</a>  <a href="/record/2750097?ln=hr" class="langinfo">Hrvatski</a>  <a href="/record/2750097?ln=it" class="langinfo">Italiano</a>  <span class="langinfo">日本語</span>  <a href="/record/2750097?ln=ka" class="langinfo">ქართული</a>  <a href="/record/2750097?ln=no" class="langinfo">Norsk/Bokmål</a>  <a href="/record/2750097?ln=pl" class="langinfo">Polski</a>  <a href="/record/2750097?ln=pt" class="langinfo">Português</a>  <a href="/record/2750097?ln=ru" class="langinfo">Русский</a>  <a href="/record/2750097?ln=sk" class="langinfo">Slovensky</a>  <a href="/record/2750097?ln=sv" class="langinfo">Svenska</a>  <a href="/record/2750097?ln=zh_CN" class="langinfo">中文(简)</a>  <a href="/record/2750097?ln=zh_TW" class="langinfo">中文(繁)</a> </div> </div>  </footer> <script type="text/javascript"> var SyndeticsBookCovers = (function() { var SMALL_SIZE = "sc.gif", MEDIUM_SIZE = "mc.gif", RAW_URL = "https://secure.syndetics.com/index.aspx?isbn=THEISBN/THESIZE&client=cernlibrary"; replaceCover = function(imgElement, isbns, hdFormat) { var img = new Image(), size = hdFormat ? MEDIUM_SIZE : SMALL_SIZE; var _isbns = isbns.sort(function(a, b) { // sort from shortest to longest ISBN (more modern) return a.length > b.length ? 1 : -1; }); function next() { var isbn = _isbns.pop(); if (isbn) { var url = RAW_URL.replace("THEISBN", isbn).replace("THESIZE", size); img.src = url; } } function done() { imgElement.src = img.src; } img.onload = function() { if (this.width > 1) { done(); } else { next(); } }; next(); }; return { replaceCover: replaceCover }; })(); $(document).ready(function() { // get book covers $("img.book-cover").each(function() { var $this = $(this), strIsbns = $this.data("isbns") || "", isbnsArray = String(strIsbns).split(","), hdFormat = $this.hasClass("hd"); SyndeticsBookCovers.replaceCover(this, isbnsArray, hdFormat); }); // WebNews tooltips $.ajax({ url: "/news/tooltips", success: function(data) { create_tooltips(data); }, dataType: "json", cache: false }); }); </script>  <script src="//cds.cern.ch/js/feedback.js"></script>   <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="https://webanalytics.web.cern.ch/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '756']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script>  </body> </html>