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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Department of Physics, University of Warwick, Coventry, United Kingdom.
Phys Rev Lett. 2024 Mar 8;132(10):102302. doi: 10.1103/PhysRevLett.132.102302.
The fraction of χ_{c1} and χ_{c2} decays in the prompt J/ψ yield, F_{χ_{c}→J/ψ}=σ_{χ_{c}→J/ψ}/σ_{J/ψ}, is measured by the LHCb detector in pPb collisions at sqrt[s_{NN}]=8.16 TeV. The study covers the forward (1.5<y^{}<4.0) and backward (-5.0<y^{}<-2.5) rapidity regions, where y^{*} is the J/ψ rapidity in the nucleon-nucleon center-of-mass system. Forward and backward rapidity samples correspond to integrated luminosities of 13.6±0.3 and 20.8±0.5 nb^{-1}, respectively. The result is presented as a function of the J/ψ transverse momentum p_{T,J/ψ} in the range 1<p_{T,J/ψ}<20 GeV/c. The F_{χ_{c}→J/ψ} fraction at forward rapidity is compatible with the LHCb measurement performed in pp collisions at sqrt[s]=7 TeV, whereas the result at backward rapidity is 2.4σ larger than in the forward region for 1<p_{T,J/ψ}<3 GeV/c. The increase of F_{χ_{c}→J/ψ} at low p_{T,J/ψ} at backward rapidity is compatible with the suppression of the ψ(2S) contribution to the prompt J/ψ yield. The lack of in-medium dissociation of χ_{c} states observed in this study sets an upper limit of 180 MeV on the free energy available in these pPb collisions to dissociate or inhibit charmonium state formation.
在质心能量(\sqrt{s_{NN}} = 8.16) TeV的质子-铅（pPb）碰撞中，大型强子对撞机底夸克探测器（LHCb）测量了(\chi_{c1})和(\chi_{c2})衰变在即时(J/\psi)产额中的占比(F_{\chi_{c}\to J/\psi}=\sigma_{\chi_{c}\to J/\psi}/\sigma_{J/\psi})。该研究涵盖了前向（(1.5 < y^{} < 4.0)）和后向（(-5.0 < y^{} < -2.5)）快度区域，其中(y^{*})是核子-核子质心系中(J/\psi)的快度。前向和后向快度样本对应的积分亮度分别为(13.6\pm0.3)和(20.8\pm0.5) nb(^{-1})。结果表示为(J/\psi)横向动量(p_{T,J/\psi})在(1 < p_{T,J/\psi} < 20) GeV/c范围内的函数。前向快度下的(F_{\chi_{c}\to J/\psi})占比与LHCb在质心能量(\sqrt{s} = 7) TeV的质子-质子（pp）碰撞中进行的测量结果相符，而在后向快度下，对于(1 < p_{T,J/\psi} < 3) GeV/c，测量结果比前向区域大(2.4\sigma)。后向快度下低(p_{T,J/\psi})时(F_{\chi_{c}\to J/\psi})的增加与(\psi(2S))对即时(J/\psi)产额贡献的抑制相符。本研究中未观察到(\chi_{c})态的介质内解离，这为这些pPb碰撞中用于解离或抑制粲夸克偶素态形成的自由能设定了(180) MeV的上限。
