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Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV

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Τίτλος: Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV
Συγγραφείς: ALICE collaboration
Στοιχεία εκδότη: Springer
Έτος έκδοσης: 2021
Συλλογή: JYX - Jyväskylä University Digital Archive / Jyväskylän yliopiston julkaisuarkisto
Θεματικοί όροι: Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at √sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher jT region, while they underestimate the lower jT region. The jT distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher jT values (called the “wide component”), related to the perturbative component of the fragmentation process, and with a Gaussian for lower jT values (called the “narrow component”), predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum, while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component, the measured trends are successfully described by all models except for Herwig. For the wide component, Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation, hiukkasfysiikka
Περιγραφή: peerReviewed
Τύπος εγγράφου: article in journal/newspaper
Περιγραφή αρχείου: application/pdf; fulltext
Γλώσσα: English
ISSN: 1126-6708
Relation: Journal of High Energy Physics; 2021
Διαθεσιμότητα: http://urn.fi/URN:NBN:fi:jyu-202111185711
Rights: CC BY 4.0 ; © CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. ; openAccess ; https://creativecommons.org/licenses/by/4.0/
Αριθμός Καταχώρησης: edsbas.227798F1
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  Label: Title
  Group: Ti
  Data: Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Jet+fragmentation+transverse+momentum+%28jT%29+distributions+are+measured+in+proton-proton+%28pp%29+and+proton-lead+%28p-Pb%29+collisions+at+√sNN+=+5%2E02+TeV+with+the+ALICE+experiment+at+the+LHC%2E+Jets+are+reconstructed+with+the+ALICE+tracking+detectors+and+electromagnetic+calorimeter+using+the+anti-kT+algorithm+with+resolution+parameter+R+=+0%2E4+in+the+pseudorapidity+range+|η|+&lt;+0%2E25%2E+The+jT+values+are+calculated+for+charged+particles+inside+a+fixed+cone+with+a+radius+R+=+0%2E4+around+the+reconstructed+jet+axis%2E+The+measured+jT+distributions+are+compared+with+a+variety+of+parton-shower+models%2E+Herwig+and+PYTHIA+8+based+models+describe+the+data+well+for+the+higher+jT+region%22&quot;&gt;Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at √sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| &lt; 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher jT region&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22while+they+underestimate+the+lower+jT+region%2E+The+jT+distributions+are+further+characterised+by+fitting+them+with+a+function+composed+of+an+inverse+gamma+function+for+higher+jT+values+%28called+the+“wide+component”%29%22&quot;&gt;while they underestimate the lower jT region. The jT distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher jT values (called the “wide component”)&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22related+to+the+perturbative+component+of+the+fragmentation+process%22&quot;&gt;related to the perturbative component of the fragmentation process&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22and+with+a+Gaussian+for+lower+jT+values+%28called+the+“narrow+component”%29%22&quot;&gt;and with a Gaussian for lower jT values (called the “narrow component”)&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22predominantly+connected+to+the+hadronisation+process%2E+The+width+of+the+Gaussian+has+only+a+weak+dependence+on+jet+transverse+momentum%22&quot;&gt;predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22while+that+of+the+inverse+gamma+function+increases+with+increasing+jet+transverse+momentum%2E+For+the+narrow+component%22&quot;&gt;while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22the+measured+trends+are+successfully+described+by+all+models+except+for+Herwig%2E+For+the+wide+component%22&quot;&gt;the measured trends are successfully described by all models except for Herwig. For the wide component&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Herwig+and+PYTHIA+8+based+models+slightly+underestimate+the+data+for+the+higher+jet+transverse+momentum+region%2E+These+measurements+set+constraints+on+models+of+jet+fragmentation+and+hadronisation%22&quot;&gt;Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22hiukkasfysiikka%22&quot;&gt;hiukkasfysiikka&lt;/searchLink&gt;
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  Data: CC BY 4.0 ; &#169; CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. ; openAccess ; https://creativecommons.org/licenses/by/4.0/
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RecordInfo BibRecord:
  BibEntity:
    Languages:
      – Text: English
    Subjects:
      – SubjectFull: Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at √sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher jT region
        Type: general
      – SubjectFull: while they underestimate the lower jT region. The jT distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher jT values (called the “wide component”)
        Type: general
      – SubjectFull: related to the perturbative component of the fragmentation process
        Type: general
      – SubjectFull: and with a Gaussian for lower jT values (called the “narrow component”)
        Type: general
      – SubjectFull: predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum
        Type: general
      – SubjectFull: while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component
        Type: general
      – SubjectFull: the measured trends are successfully described by all models except for Herwig. For the wide component
        Type: general
      – SubjectFull: Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation
        Type: general
      – SubjectFull: hiukkasfysiikka
        Type: general
    Titles:
      – TitleFull: Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV
        Type: main
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            NameFull: ALICE collaboration
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          Dates:
            – D: 01
              M: 01
              Type: published
              Y: 2021
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