J/ψ production as a function of charged particle multiplicity in pp collisions at √s=7 TeV
J/ψ production as a function of charged particle multiplicity in pp collisions at √s=7 TeV
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DOI：
10.1016/j.physletb.2012.04.052
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发表时间：
2012-06-06
影响因子：
4.4
通讯作者：
Zynovyev, M.
中科院分区：
文献类型：
--
作者：
Abelev, B.;Adam, J.;Zynovyev, M.
ALICE合作组织报告了在LHC上测量的相对J/psi产额作为pp碰撞中带电粒子赝快度密度dN（ch）/d eta的函数，根s = 7 TeV。当p（t）> 0时，在快度区间垂直条y垂直条< 0.9通过衰变为e（+）e（-），在区间2.5 < y < 4.0通过衰变为mu（+）/mu（-）对，检测到J/psi粒子。在两个快度范围内都观察到J/psi产额相对于它们的事件平均值（dN（J/psi）/dy）/（dN（J/psi）/dy）与（dN（ch）/c eta）/（dN（ch）/d eta）的近似线性增加，其中dN（ch）/d eta是在竖线eta < 1和p（t）> 0内测量的。在（dN（ch）/d eta）（bin））= 24.1的最高多重性区间中，对应于最小偏差多重性密度的四倍，在2.5
The ALICE Collaboration reports the measurement of the relative J/psi yield as a function of charged particle pseudorapidity density dN(ch)/d eta in pp collisions at root s = 7 TeV at the LHC. J/psi particles are detected for p(t) > 0, in the rapidity interval vertical bar y vertical bar < 0.9 via decay into e(+)e(-), and in the interval 2.5 < y < 4.0 via decay into mu(+)/mu(-) pairs. An approximately linear increase of the J/psi yields normalized to their event average (dN(J/psi)/dy)/(dN(J/psi)/dy) with (dN(ch)/c eta)/(dN(ch)/d eta) is observed in both rapidity ranges, where dN(ch)/d eta is measured within vertical bar eta vertical bar < 1 and p(t) > 0. In the highest multiplicity interval with (dN(ch)/d eta)(bin)) = 24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/psi yield by a factor of about 5 at 2.5 < y