Szczegóły publikacji
Opis bibliograficzny
Observation of forward neutron multiplicity dependence of dimuon acoplanarity in ultraperipheral Pb-Pb collisions at $\sqrt{s_{NN}}$=5.02 TeV / A. M. Sirunyan, [et al.], V. AVATI, L. GRZANKA, M. MALAWSKI, [et al.] // Physical Review Letters ; ISSN 0031-9007. — 2021 — vol. 127 iss. 12, s. 122001-1–122001-19. — Bibliogr. s. 122001-6–122001-7. — Publikacja dostępna online od: 2021-09-17
Autorzy (2352)
- AGHAvati Valentina
- AGHGrzanka Leszek
- AGHMalawski Maciej
- Sirunyan A. M.
Dane bibliometryczne
| ID BaDAP | 137036 |
|---|---|
| Data dodania do BaDAP | 2021-10-26 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevLett.127.122001 |
| Rok publikacji | 2021 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
The first measurement of the dependence of γγ→μ+μ- production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions at sNN=5.02 TeV, with an integrated luminosity of approximately 1.5 nb-1, are collected using the CMS detector at the LHC. The azimuthal correlations between the two muons in the invariant mass region 8<mμμ<60 GeV are extracted for events including 0, 1, or at least 2 neutrons detected in the forward pseudorapidity range |η|>8.3. The back-to-back correlation structure from leading-order photon-photon scattering is found to be significantly broader for events with a larger number of emitted neutrons from each nucleus, corresponding to interactions with a smaller impact parameter. This observation provides a data-driven demonstration that the average transverse momentum of photons emitted from relativistic heavy ions has an impact parameter dependence. These results provide new constraints on models of photon-induced interactions in ultraperipheral collisions. They also provide a baseline to search for possible final-state effects on lepton pairs caused by traversing a quark-gluon plasma produced in hadronic heavy ion collisions. © 2021 CERN, for the CMS Collaboration.
