A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
ψ(2S) suppression in Pb-Pb collisions at the LHC (2024)
ALICE collaboration. (2024). ψ(2S) suppression in Pb-Pb collisions at the LHC. Physical Review Letters, 132, Article 042301. https://doi.org/10.1103/PhysRevLett.132.042301
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: ALICE collaboration
Lehti tai sarja: Physical Review Letters
ISSN: 0031-9007
eISSN: 1079-7114
Julkaisuvuosi: 2024
Ilmestymispäivä: 24.01.2024
Volyymi: 132
Artikkelinumero: 042301
Kustantaja: American Physical Society (APS)
Julkaisumaa: Yhdysvallat (USA)
Julkaisun kieli: englanti
DOI: https://doi.org/10.1103/PhysRevLett.132.042301
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/95157
Julkaisu on rinnakkaistallennettu: https://arxiv.org/abs/2210.08893
Tiivistelmä
The production of the ψ(2S) charmonium state was measured with ALICE in Pb-Pb collisions at √sNN=5.02 TeV, in the dimuon decay channel. A significant signal was observed for the first time at LHC energies down to zero transverse momentum, at forward rapidity (2.5<4). The measurement of the ratio of the inclusive production cross sections of the ψ(2S) and J/ψ resonances is reported as a function of the centrality of the collisions and of transverse momentum, in the region pT<12 GeV/c. The results are compared with the corresponding measurements in pp collisions, by forming the double ratio [σψ(2S)/σJ/ψ]Pb−Pb/[σψ(2S)/σJ/ψ]pp. It is found that in Pb-Pb collisions the ψ(2S) is suppressed by a factor of ∼2 with respect to the J/ψ. The ψ(2S) nuclear modification factor RAA was also obtained as a function of both centrality and pT. The results show that the ψ(2S) resonance yield is strongly suppressed in Pb-Pb collisions, by a factor up to ∼3 with respect to pp. Comparisons of cross section ratios with previous SPS findings by the NA50 experiment and of RAA with higher-pT results at LHC energy are also reported. These results and the corresponding comparisons with calculations of transport and statistical models address questions on the presence and properties of charmonium states in the quark-gluon plasma formed in nuclear collisions at the LHC.
YSO-asiasanat: ydinfysiikka; hiukkasfysiikka
Vapaat asiasanat: color confinement; relativistic heavy-ion collisions; quarkonia
Liittyvät organisaatiot
Hankkeet, joissa julkaisu on tehty
- The strong interaction at the frontier of knowledge: fundamental research and applications- STRONG- 2020
- Lappi, Tuomas
- Euroopan komissio
- Kvarkkiaineen tutkimuksen huippuyksikkö
- Räsänen, Sami
- Suomen Akatemia
- Kvarkkiaineen tutkimuksen huippuyksikö
- Kim, Dong
- Suomen Akatemia
OKM-raportointi: Kyllä
Alustava JUFO-taso: 3