Exclusive photoproduction of excited ρ mesons decaying to four pions in ultraperipheral Pb–Pb collisions at sNN=5.02 TeV
  • Acharya, S.
  • Adamova, D.
  • Agarwal, A.
  • Rinella, G. Aglieri
  • Aglietta, L.
  • 외 1,065명
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초록

The intense photon fluxes from relativistic nuclei provide an opportunity to study photonuclear interactions in ultraperipheral collisions. In particular, it allows for the investigations of excited, light-flavour vector mesons. The measurement of coherently photoproduced π+π−π+π− final states in ultraperipheral Pb–Pb collisions at sNN=5.02 TeV is presented for the first time. The cross section, d σ /d y , times the branching ratio (ρ→π+π+π−π−) is found to be 47.8 ± 2.3 (stat.) ± 7.7 (syst.) mb in the rapidity interval | y | < 0.5. The invariant mass distribution is not well described with a single Breit-Wigner resonance without an interference term. Including interference with a non-resonant contribution results in the mass and width values being too far from those reported in PDG, while the production of two interfering resonances, ρ (1450) and ρ (1700), also provides a good description of the data. The values of the masses ( m ) and widths (Γ) of the resonances extracted from the fit assuming two interfering resonances are m1=1385±14(stat.)±3(syst.) MeV/ c 2, Γ1=431±36(stat.)±82(syst.) MeV/ c 2, m2=1663±13(stat.)±22(syst.) MeV/ c 2 and Γ2=357±31(stat.)±49(syst.) MeV/ c 2, respectively. The measured cross sections times the branching ratios are compared to recent theoretical predictions.

키워드

Exclusive photoproductionUltraperipheral collisionsVector mesonsHIGH-ENERGYPP INTERACTIONSPHOTONPI(+)PI(-)STATESGAMMAMASS
제목
Exclusive photoproduction of excited ρ mesons decaying to four pions in ultraperipheral Pb–Pb collisions at sNN=5.02 TeV
저자
Acharya, S.Adamova, D.Agarwal, A.Rinella, G. 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DOI
10.1016/j.physletb.2025.140006
발행일
2026-01
유형
Article
저널명
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
872