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<!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="en" xml:lang="en" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>Particle production in p-Pb collisions with ALICE at the LHC - 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="https://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="https://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="https://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="https://cds.cern.ch/record/2063620/plots" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2063620/plots?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2063620/plots?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2063620/plots?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2063620/plots?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2063620/plots?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2063620/plots?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2063620/plots?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2063620/plots?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2063620/plots?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2063620/plots?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2063620/plots?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2063620/plots?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2063620/plots?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2063620/plots?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2063620/plots?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2063620/plots?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2063620/plots?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2063620/plots?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2063620/plots?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=en" /> <link rel="search" type="application/opensearchdescription+xml" href="https://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="https://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="en" /> <meta name="description" content="Measurements of the transverse momentum spectra of light flavor particles at intermediate and high pT are an important tool for QCD studies. In pp collisions they provide a baseline for perturbative QCD, while in Pb-Pb they are used to investigate the suppression caused by the surrounding medium. In p-Pb collisions, such measurements provide a reference to disentangle final from initial state effects and thus play an important role in the search for signatures of the formation of a deconfined hot medium. While the comparison of the p-Pb and Pb-Pb data indicates that initial state effects do not play a role in the suppression of hadron production observed at high pT in heavy ion collisions, several measurements of particle production in the low and intermediate pT region indicate the presence of collective effects. Measurements of the transverse momentum spectra of light flavor particles at intermediate and high p_T are an important tool for QCD studies. In pp collisions they provide a baseline for perturbative QCD, while in Pb-Pb they are used to investigate the suppression caused by the surrounding medium. In p-Pb collisions, such measurements provide a reference to disentangle final from initial state effects and thus play an important role in the search for signatures of the formation of a deconfined hot medium. While the comparison of the p-Pb and Pb-Pb data indicates that initial state effects do not play a role in the suppression of hadron production observed at high p_T in heavy ion collisions, several measurements of particle production in the low and intermediate p_T region indicate the presence of collective effects. Measurements of the transverse momentum spectra of light flavor particles at intermediate and high pT are an important tool for QCD studies. In pp collisions they provide a baseline for perturbative QCD, while in Pb-Pb they are used to investigate the suppression caused by the surrounding medium. In p-Pb collisions, such measurements provide a reference to disentangle final from initial state effects and thus play an important role in the search for signatures of the formation of a deconfined hot medium. While the comparison of the p-Pb and Pb-Pb data indicates that initial state effects do not play a role in the suppression of hadron production observed at high pT in heavy ion collisions, several measurements of particle production in the low and intermediate pT region indicate the presence of collective effects. 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While the comparison of the p-Pb and Pb-Pb data indicates that initial state effects do not play a role in the suppression of hadron production observed at high p_T in heavy ion collisions, several measurements of particle production in the low and intermediate p_T region indicate the presence of collective effects." property="og:description" /> <meta content="EDP Sciences" property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="ALICE32Preprints search" lang="en">  <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=en&referer=https%3A//cds.cern.ch/record/2063620/plots" 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="https://cds.cern.ch/?ln=en">Search</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=en">Submit</a></li> <li class="menu-426 "><a class="" href="https://cds.cern.ch/help/?ln=en">Help</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=en">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=en">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=en">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=en">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=en" class="navtrail">Home</a> > <a href="/collection/CERN%20Experiments?ln=en" class="navtrail">CERN Experiments</a> > <a href="/collection/LHC%20Experiments?ln=en" class="navtrail">LHC Experiments</a> > <a href="/collection/ALICE?ln=en" class="navtrail">ALICE</a> > <a href="/collection/ALICE%20Preprints?ln=en" class="navtrail">ALICE Preprints</a> > <a class="navtrail" href="/record/2063620">Particle production in p-Pb collisions with ALICE at the LHC</a> > Plots </td> </tr> </table> </div> <div class="pagebody"><div class="pagebodystripemiddle"> <div class="detailedrecordbox"> <div class="detailedrecordtabs"> <div> <ul class="detailedrecordtabs"><li class="first"><a href="/record/2063620/?ln=en">Information </a></li><li class=""><a href="/record/2063620/comments?ln=en">Discussion </a></li><li class=""><a href="/record/2063620/files?ln=en">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">  <div id="detailedrecordshortreminder"> <div id="clip"> </div> <div id="HB"> <strong><a href="/record/2063620?ln=en">Particle production in p-Pb collisions with ALICE at the LHC</a></strong> - <a href="/search?f=author&p=Toia%2C%20Alberica&ln=en">Toia, Alberica</a> - arXiv:1510.08730 </div> </div> <div style="clear:both;height:1px"> </div> <table width="95%" style="display: inline;"><tr><td width="66%"><a name="0" href="https://cds.cern.ch/record/2063620/files/meanMult_withB2.png"><img src="https://cds.cern.ch/record/2063620/files/meanMult_withB2.png" width="95%"/></a></td><td width="33%"> Left: Multiplicity fluctuation bias quantified as the mean multiplicity per $\avNpart / \mu$ from the NBD-Glauber MC in \pPb\ and \PbPb\ calculations. Right: Number of hard scatterings (MSTI(31) in PYTHIA6) per \Ncoll\ as a function of the centrality calculated with a toy MC that couples a pp PYTHIA6 calculation to a \pPb\ Glauber MC.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="1" href="https://cds.cern.ch/record/2063620/files/NhardNcoll.png"><img src="https://cds.cern.ch/record/2063620/files/NhardNcoll.png" width="95%"/></a></td><td width="33%"> Left: Multiplicity fluctuation bias quantified as the mean multiplicity per $\avNpart / \mu$ from the NBD-Glauber MC in \pPb\ and \PbPb\ calculations. Right: Number of hard scatterings (MSTI(31) in PYTHIA6) per \Ncoll\ as a function of the centrality calculated with a toy MC that couples a pp PYTHIA6 calculation to a \pPb\ Glauber MC.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="2" href="https://cds.cern.ch/record/2063620/files/ZNAGlau.png"><img src="https://cds.cern.ch/record/2063620/files/ZNAGlau.png" width="95%"/></a></td><td width="33%"> Distribution of the sum of amplitudes in the V0 hodoscopes (left) and of the neutron energy spectrum measured in the ZN calorimeter (right) in the Pb-remnant side (A). (Pb-going). Centrality classes are indicated by vertical lines. The distributions are fitted with a Glauber model coupled to a NBD (left) or with the SNM-model (right) and are shown as a line.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="3" href="https://cds.cern.ch/record/2063620/files/NchNpart1.png"><img src="https://cds.cern.ch/record/2063620/files/NchNpart1.png" width="95%"/></a></td><td width="33%"> Left: Asymmetry of particle yield, as a function of the pseudorapidity density at mid-rapidity for various centrality classes and estimators. Right: Pseudorapidity density of charged particles at mid-rapidity per participant as a function of \Npart\ for various centrality estimators.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="4" href="https://cds.cern.ch/record/2063620/files/QpPbCL1GlauberPythiarebinned.png"><img src="https://cds.cern.ch/record/2063620/files/QpPbCL1GlauberPythiarebinned.png" width="95%"/></a></td><td width="33%"> \qpa\ calculated with CL1 estimator (left), the lines are the G-PYTHIA calculations; with the hybrid method (right), spectra are measured in ZNA-classes and \Ncoll\ are obtained with the assumption that forward multiplicity is proportional to \Nparttar.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="5" href="https://cds.cern.ch/record/2063620/files/V0AGlau.png"><img src="https://cds.cern.ch/record/2063620/files/V0AGlau.png" width="95%"/></a></td><td width="33%"> Distribution of the sum of amplitudes in the V0 hodoscopes (left) and of the neutron energy spectrum measured in the ZN calorimeter (right) in the Pb-remnant side (A). (Pb-going). Centrality classes are indicated by vertical lines. The distributions are fitted with a Glauber model coupled to a NBD (left) or with the SNM-model (right) and are shown as a line.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="6" href="https://cds.cern.ch/record/2063620/files/convolution.png"><img src="https://cds.cern.ch/record/2063620/files/convolution.png" width="95%"/></a></td><td width="33%"> V0A ring1 signal distributions. The top left panel shows the distribution for MB events together with a NBD-Glauber fit. The remaining panels show the distributions and mean values for centrality classes selected with ZNA. These are compared to those obtained by the convolution of the ${\cal P}(\Ncoll | cent_{\rm ZNA})$ distributions from the SNM with the NBD from the NBD-Glauber fit to V0A ring1. Data are also compared to the distributions obtained with an unfolding procedure, where the \Ncoll\ distributions have been fitted to the data using the parameters from the NBD-Glauber fit. The bottom right panel compares the mean values of these distributions as a function of the centrality.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="7" href="https://cds.cern.ch/record/2063620/files/HybNpartTargQpPb.png"><img src="https://cds.cern.ch/record/2063620/files/HybNpartTargQpPb.png" width="95%"/></a></td><td width="33%"> \qpa\ calculated with CL1 estimator (left), the lines are the G-PYTHIA calculations; with the hybrid method (right), spectra are measured in ZNA-classes and \Ncoll\ are obtained with the assumption that forward multiplicity is proportional to \Nparttar.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="8" href="https://cds.cern.ch/record/2063620/files/fit_linear.png"><img src="https://cds.cern.ch/record/2063620/files/fit_linear.png" width="95%"/></a></td><td width="33%"> Left: Normalized signal from various observables versus the normalized charged-particle density, fit with a linear function of \Npart. Right: Results from the fits as a function of the pseudorapidity covered by the various observables. The red horizontal lines indicate the ideal \Npart\ and \Ncoll\ geometrical scalings. The most central point is excluded from the fit, to avoid pile-up effects. PHOBOS points taken from \cite{Back:2004mr}.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="9" href="https://cds.cern.ch/record/2063620/files/Nch_Asym.png"><img src="https://cds.cern.ch/record/2063620/files/Nch_Asym.png" width="95%"/></a></td><td width="33%"> Left: Asymmetry of particle yield, as a function of the pseudorapidity density at mid-rapidity for various centrality classes and estimators. Right: Pseudorapidity density of charged particles at mid-rapidity per participant as a function of \Npart\ for various centrality estimators.</td></tr></table><table width="95%" style="display: inline;"><tr><td width="66%"><a name="10" href="https://cds.cern.ch/record/2063620/files/scalingvsdNdeta.png"><img src="https://cds.cern.ch/record/2063620/files/scalingvsdNdeta.png" width="95%"/></a></td><td width="33%"> Left: Normalized signal from various observables versus the normalized charged-particle density, fit with a linear function of \Npart. Right: Results from the fits as a function of the pseudorapidity covered by the various observables. The red horizontal lines indicate the ideal \Npart\ and \Ncoll\ geometrical scalings. The most central point is excluded from the fit, to avoid pile-up effects. PHOBOS points taken from \cite{Back:2004mr}.</td></tr></table><br /><br /> <div class="bottom-left-folded"></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/> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="https://cds.cern.ch/?ln=en">Search</a> :: <a class="footer" href="https://cds.cern.ch/submit?ln=en">Submit</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> :: <a class="footer" href="https://cds.cern.ch/help/?ln=en">Help</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 /> Maintained by <a class="footer" href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Service</a> - Need help? 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