Refine
Year of publication
Document Type
- Preprint (505)
- Article (335)
- Part of Periodical (1)
- Working Paper (1)
Language
- English (842)
Has Fulltext
- yes (842)
Is part of the Bibliography
- no (842)
Keywords
- BESIII (17)
- Heavy Ion Experiments (13)
- e +-e − Experiments (13)
- Branching fraction (9)
- Hadron-Hadron scattering (experiments) (8)
- Particle and Resonance Production (8)
- Hadron-Hadron Scattering (7)
- Quarkonium (6)
- Spectroscopy (6)
- Hadronic decays (5)
Institute
- Physik (778)
- Frankfurt Institute for Advanced Studies (FIAS) (534)
- Informatik (465)
- Medizin (2)
- Biodiversität und Klima Forschungszentrum (BiK-F) (1)
- Center for Financial Studies (CFS) (1)
- House of Finance (HoF) (1)
- Institut für Ökologie, Evolution und Diversität (1)
- Sustainable Architecture for Finance in Europe (SAFE) (1)
- Wirtschaftswissenschaften (1)
Coherent photoproduction of ρ⁰ vector mesons in ultra-peripheral Pb-Pb collisions at √sNN = 5.02 TeV
(2020)
Cross sections for the coherent photoproduction of ρ0 vector mesons in ultra-peripheral Pb-Pb collisions at sNN−−−√ = 5.02 TeV are reported. The measurements, which rely on the π+π− decay channel, are presented in three regions of rapidity covering the range |y| < 0.8. For each rapidity interval, cross sections are shown for different nuclear-breakup classes defined according to the presence of neutrons measured in the zero-degree calorimeters. The results are compared with predictions based on different models of nuclear shadowing. Finally, the observation of a coherently produced resonance-like structure with a mass around 1.7 GeV/c2 and a width of about 140 MeV/c2 is reported and compared with similar observations from other experiments.
We present the first measurements of charge-dependent correlations on angular difference variables η1 − η2 (pseudorapidity) and φ1 − φ2 (azimuth) for primary charged hadrons with transverse momentum 0.15 <= pt <= 2 GeV/c and |η| <= 1.3 from Au–Au collisions at √sNN = 130 GeV. We observe correlation structures not predicted by theory but consistent with evolution of hadron emission geometry with increasing centrality from one-dimensional fragmentation of color strings along the beam direction to an at least two-dimensional hadronization geometry along the beam and azimuth directions of a hadron-opaque bulk medium.