Multiplicity dependence of (anti-)deuteron production in pp collisions at s=7TeV

  • Yazar/lar KARASU UYSAL, Ayben
    ALICE Collaboration
  • Yayın Türü Makale
  • Yayın Tarihi 2019
  • DOI Numarası 10.1016/j.physletb.2019.05.028
  • Yayıncı Elsevier B.V.
  • Tek Biçim Adres http://hdl.handle.net/20.500.12498/2772

In this letter, the production of deuterons and anti-deuterons in pp collisions at s=7 TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the deuteron transverse momentum (pT). The measurements are discussed in the context of hadron � coalescence models. The coalescence parameter B2, extracted from the measured spectra of (anti-)deuterons and primary (anti-)protons, exhibits no significant pT-dependence for pT<3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B2 parameter is found to decrease smoothly from low multiplicity pp to Pb � Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb � Pb collisions. The ratio between the pT-integrated yield of deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC. � 2019 The Author(s)

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ISSN
(dc.identifier.issn)
03702693 (ISSN)
Yayıncı
(dc.publisher)
Elsevier B.V.
Eser Adı
(dc.title)
Multiplicity dependence of (anti-)deuteron production in pp collisions at s=7TeV
Özet
(dc.description.abstract)
In this letter, the production of deuterons and anti-deuterons in pp collisions at s=7 TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the deuteron transverse momentum (pT). The measurements are discussed in the context of hadron � coalescence models. The coalescence parameter B2, extracted from the measured spectra of (anti-)deuterons and primary (anti-)protons, exhibits no significant pT-dependence for pT<3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B2 parameter is found to decrease smoothly from low multiplicity pp to Pb � Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb � Pb collisions. The ratio between the pT-integrated yield of deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC. � 2019 The Author(s)
Yayın Tarihi
(dc.date.issued)
2019
Kayıt Giriş Tarihi
(dc.date.accessioned)
2020-08-07T12:50:34Z
Açık Erişim tarihi
(dc.date.available)
2020-08-07T12:50:34Z
Yayın Dili
(dc.language.iso)
eng
Yayın Türü
(dc.type)
Makale
Yazar/lar
(dc.contributor.author)
KARASU UYSAL, Ayben
Yazar/lar
(dc.contributor.author)
ALICE Collaboration
Tek Biçim Adres
(dc.identifier.uri)
http://hdl.handle.net/20.500.12498/2772
DOI Numarası
(dc.identifier.doi)
10.1016/j.physletb.2019.05.028
Atıf Dizini
(dc.source.database)
Scopus
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