论文标题
超长铅铅碰撞中炭的独家光生摄取的独家生产研究
Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions
论文作者
论文摘要
The cross-sections of exclusive (coherent) photoproduction $J/ψ$ and $ψ(\mathrm{2S})$ mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of $5.02\,\mathrm{TeV}$ are measured using a data sample corresponding to an integrated luminosity of $228\pm10\,\mathrm{μb}^{-1}$, collected by the LHCb experiment in 2018. The differential cross-sections are measured separately as a function of transverse momentum and rapidity in the nucleus-nucleus centre-of-mass frame for $J/ψ$ and $ψ(\mathrm{2S})$ mesons.集成的横截面的测量为\ mbox {$σ^\ mathrm {coh} _ {j/ψ} = 5.965 \ pm 0.059 \ pm 0.232 \ pm 0.262 \ pm 0.262 \，\ mathrm {mbhrm {mb} $} $} $} $} $} $}和\ mbox {$σ^\ mathrm {coh} _ {ψ（\ mathrm {2s}）} = 0.923 \ pm 0.086 \ pm 0.028 \ pm 0.028 \ pm 0.040 \，\ \ mathrm {mb} $}，在其中第一个列出了不确定的属性，第二个系统属于第三个系统，第三个系统，第三次统计。 The cross-section ratio is measured to be \mbox{$σ^\mathrm{coh}_{ψ(\mathrm{2S})}/σ^\mathrm{coh}_{J/ψ} = 0.155 \pm 0.014 \pm 0.003$}, where the first uncertainty is statistical and the second is systematic.这些结果与理论预测兼容。
The cross-sections of exclusive (coherent) photoproduction $J/ψ$ and $ψ(\mathrm{2S})$ mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of $5.02\,\mathrm{TeV}$ are measured using a data sample corresponding to an integrated luminosity of $228\pm10\,\mathrm{μb}^{-1}$, collected by the LHCb experiment in 2018. The differential cross-sections are measured separately as a function of transverse momentum and rapidity in the nucleus-nucleus centre-of-mass frame for $J/ψ$ and $ψ(\mathrm{2S})$ mesons. The integrated cross-sections are measured to be \mbox{$σ^\mathrm{coh}_{J/ψ} = 5.965 \pm 0.059 \pm 0.232 \pm 0.262\,\mathrm{mb}$} and \mbox{$σ^\mathrm{coh}_{ψ(\mathrm{2S})} = 0.923 \pm 0.086 \pm 0.028 \pm 0.040\,\mathrm{mb}$}, where the first listed uncertainty is statistical, the second systematic and the third due to the luminosity determination. The cross-section ratio is measured to be \mbox{$σ^\mathrm{coh}_{ψ(\mathrm{2S})}/σ^\mathrm{coh}_{J/ψ} = 0.155 \pm 0.014 \pm 0.003$}, where the first uncertainty is statistical and the second is systematic. These results are compatible with theoretical predictions.
