First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at √sNN=5.44 TeV

Acharya, S.; ...; Antičić, Tome; ...; Erhardt, Filip; ...; Gotovac, Sven; ...; Jerčić, Marko; ...; Karatović, David; ...; Lončar, Petra; ...; Mudnić, Eugen; ...; Planinić, Mirko; ...; Poljak, Nikola; ...; Vicković, Linda; ...; Zurlo, N.

doi:10.1016/j.physletb.2021.136481

Pregled bibliografske jedinice broj: 1140123

First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at √sNN=5.44 TeV

(ALICE Collaboration) Acharya, S.; ...; Antičić, Tome; ...; Erhardt, Filip; ...; Gotovac, Sven; ...; Jerčić, Marko; ... et al.

First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at √sNN=5.44 TeV // Physics letters. B, 820 (2021), 136481, 22 doi:10.1016/j.physletb.2021.136481 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 1140123 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at √sNN=5.44 TeV

Autori
Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Karatović, David ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Vicković, Linda ; ... ; Zurlo, N.

Kolaboracija
ALICE Collaboration

Izvornik
Physics letters. B (0370-2693) 820 (2021); 136481, 22

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
rho(770)0: photoproduction ; nucleus: shadowing ; pi: production ; dissociation: electromagnetic ; coherence ; quantum chromodynamics ; vector meson ; experimental results ; rho(770)0 --> pi+ pi- ; 5440 GeV-cms/nucleon

Sažetak
The first measurement of the coherent photoproduction of ρ0 vector mesons in ultra- peripheral Xe–Xe collisions at sNN=5.44 TeV is presented. This result, together with previous HERA γp data and γ–Pb measurements from ALICE, describes the atomic number (A) dependence of this process, which is particularly sensitive to nuclear shadowing effects and to the approach to the black-disc limit of QCD at a semi-hard scale. The cross section of the Xe+Xe→ρ0+Xe+Xe process, measured at midrapidity through the decay channel ρ0→π+π−, is found to be dσ/dy=131.5±5.6(stat.)−16.9+17.5(syst.) mb. The ratio of the continuum to resonant contributions for the production of pion pairs is also measured. In addition, the fraction of events accompanied by electromagnetic dissociation of either one or both colliding nuclei is reported. The dependence on A of cross section for the coherent ρ0 photoproduction at a centre-of-mass energy per nucleon of the γA system of WγA, n=65 GeV is found to be consistent with a power-law behaviour σ(γA→ρ0A)∝Aα with a slope α=0.96±0.02(syst.). This slope signals important shadowing effects, but it is still far from the behaviour expected in the black- disc limit.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA

Ustanove:
Fakultet elektrotehnike, strojarstva i brodogradnje, Split,
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Profili:

David Karatović (autor)