Measurement of χc1(3872) production in proton-proton collisions at 8 and 13 TeV
Measurement of χc1(3872) production in proton-proton collisions at 8 and 13 TeV
复制标题
8 和 13 TeV 质子-质子碰撞中 Ïc1(3872) 产生的测量
DOI：
10.1007/jhep01(2022)131
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发表时间：
2022
影响因子：
5.4
通讯作者：
LHCb collaboration
中科院分区：
文献类型：
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作者：
LHCb collaboration
χ c1（3872）态相对于π（2S）介子的产生截面是用LHCb实验在质心能量= 8和13 TeV下收集的质子-质子碰撞数据测量的，对应的积分光度分别为2.0和5.4 fb− 1。这两个介子在J/π π+ π−末态下被重建。在4<pT < 20 GeV/c和2. 0 GeV/c的运动学范围内，测量了χ c1（3872）和χ c2（2S）态的瞬发和非瞬发产生截面与χ c1（3872）和χ c2（2S）态的横动量pT和快度y的比值. 0< y< 4。5.发现提示比随着p T的增加而增加，与y无关。对于瞬发分量，在13和8 TeV之间的χ c1（3872）和（2S）产生截面的两倍比率被观察到与单位一致，与pT和质心能量无关。
The production cross-section of the χ c1 (3872) state relative to the ψ (2S) meson is measured using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of= 8 and 13 TeV, corresponding to integrated luminosities of 2.0 and 5.4 fb− 1, respectively. The two mesons are reconstructed in the J/ψπ+ π− final state. The ratios of the prompt and nonprompt χ c1 (3872) to ψ (2S) production cross-sections are measured as a function of transverse momentum, p T, and rapidity, y, of the χ c1 (3872) and ψ (2S) states, in the kinematic range 4< p T< 20 GeV/c and 2. 0< y< 4. 5. The prompt ratio is found to increase with p T, independently of y. For the prompt component, the double ratio of the χ c1 (3872) and ψ (2S) production cross-sections between 13 and 8 TeV is observed to be consistent with unity, independent of p T and centre-of-mass energy.