Bottomonium spectroscopy in the quark-gluon plasma

• Verfasst von: Wolschin, Georg [VerfasserIn]
• Titel: Bottomonium spectroscopy in the quark-gluon plasma
• Verf.angabe: Georg Wolschin
• E-Jahr: 2020
• Jahr: 14 October 2020
• Umfang: 39 S.
• Fussnoten: Gesehen am 19.11.2020
• Titel Quelle: Enthalten in: International journal of modern physics / A
• Ort Quelle: Singapur : World Scientific Publ., 1986
• Jahr Quelle: 2020
• Band/Heft Quelle: 35(2020,29) Artikel-Nummer 2030016, 39 Seiten
• ISSN Quelle: 1793-656X
• DOI: doi:10.1142/S0217751X20300161
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1739134583

Abstract

The spectroscopic properties of heavy quarkonia are substantially different in the quark-gluon plasma (QGP) that is created in relativistic heavy-ion collisions as compared to the vacuum situation that can be tested in pppp<math display="inline" overflow="scroll" altimg="eq-00001.gif"><mi>p</mi><mi>p</mi></math> collisions at the same center-of-mass energy. In this paper, a series of recent works about the dissociation of the Υ(nS)Υ(nS)<math display="inline" overflow="scroll" altimg="eq-00002.gif"><mi mathvariant="normal">Υ</mi><mo class="MathClass-open" stretchy="false">(</mo><mi>n</mi><mi>S</mi><mo class="MathClass-close" stretchy="false">)</mo></math> and χb(nP)χb(nP)<math display="inline" overflow="scroll" altimg="eq-00003.gif"><msub><mrow><mi>χ</mi></mrow><mrow><mi>b</mi></mrow></msub><mo class="MathClass-open" stretchy="false">(</mo><mi>n</mi><mi>P</mi><mo class="MathClass-close" stretchy="false">)</mo></math> states in the hot QGP are summarized. Quarkonia dissociation occurs due to (1) screening of the real quark-antiquark potential, (2) collisional damping through the imaginary part of the potential, and (3) gluon-induced dissociation. In addition, reduced feed-down plays a decisive role for the spin-triplet ground state. Transverse-momentum and centrality-dependent data are well reproduced in Pb-Pb collisions at LHC energies. In the asymmetric pp<math display="inline" overflow="scroll" altimg="eq-00004.gif"><mi>p</mi></math>-Pb system, alterations of the parton density functions in the lead nucleus account for the leading fraction of the modifications in cold nuclear matter (CNM), but the hot-medium effects turn out to be relevant in spite of the small initial spatial extent of the fireball, providing additional evidence for the generation of a quark-gluon droplet.