| Article | |
| Title | $J/\psi$ yield enhancement at very low transverse momentum in Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} = \mathrm{5.02 \,TeV}$ with ALICE |
| Author(s) | Zhou, Zhuo (Bergen U.) |
| Collaboration | ALICE Collaboration |
| Publication | SISSA, 2019 |
| Number of pages | 4 |
| In: | PoS High-pT2017 (2019) 028 |
| In: | 12th International workshop on high-pT physics in the RHIC/LHC era (HPT), Bergen, Norvege, 2 - 5 Oct 2017, pp.028 |
| DOI | 10.22323/1.320.0028 |
| Subject category | Particle Physics - Experiment ; Nuclear Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ALICE |
| Abstract | A large excess in the yield of $\mathrm{J/\psi}$ at very low transverse momentum (${p}_\mathrm{T}<\mathrm{300 MeV/}c$) and forward rapidity (2.5$<y<$4.0) was recently reported by $\mathrm{ALICE}$ using the LHC Run-1 data, in Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} = \mathrm{2.76 \,TeV}$. This is suggestive of coherent $\mathrm{J/\psi}$ photo-production, similar to measurements in ultra-peripheral collisions (UPC), where the nuclei only interact electromagnetically.During the LHC Run-2, the measurement of the very low ${p}_\mathrm{T}$ $\mathrm{J/\psi}$ at mid-rapidity (-0.9$<y<$0.9) in the di-electron decay channel was possible thanks to the large sample of recorded Pb-Pb collisions. The central barrel detectors provide a good momentum resolution, and make the measurement sensitive to the key characteristics of $\mathrm{J/\psi}$ coherent photo-production, like the corresponding transverse momentum spectrum.In this talk, it will focus on the $\mathrm{J/\psi}$ production in the very low-${p}_\mathrm{T}$ range in peripheral Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02 \,TeV$. The ${p}_\mathrm{T}$ spectrum shape for coherent production will be shown and compared to UPC measurements. |
| Copyright/License | © 2019-2024 the author(s) (License: CC-BY-NC-ND-4.0) |
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Record created 2022-09-16, last modified 2022-09-19
