Angular decay coefficients of J/ψ mesons at forward rapidity from p+p collisions at s=510??GeV
Angular decay coefficients of J/ψ mesons at forward rapidity from p+p collisions at s=510??GeV
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s=510??GeV 时 p+p 碰撞的 J/ψ 介子在前向速度下的角衰变系数
DOI：
10.1103/physrevd.95.092003
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发表时间：
2017
影响因子：
5
通讯作者：
(PHENIX Collaboration)
中科院分区：
文献类型：
--
作者：
Aidala C. 、、、 SHIMOMURA M. et al;(PHENIX Collaboration)
我们报道了第一次测量包含电子在碰撞中的全角分布。测量是在螺旋度、柯林斯-索珀和戈特弗里德-杰克逊参照系中进行的。在所有的框架中，极向系数在低处强烈为负，在高处变得接近于零，而方位向系数在低处接近于零，在高处变得略为负。帧无关系数λ˜在所有帧中都是强负的。数据与非相对论量子色动力学模型提供的理论预测进行了比较。
We report the first measurement of the full angular distribution for inclusivedecays incollisions at. The measurements are made fortransverse momentumand rapidityin the Helicity, Collins-Soper, and Gottfried-Jackson reference frames. In all frames the polar coefficientis strongly negative at lowand becomes close to zero at high, while the azimuthal coefficientis close to zero at low, and becomes slightly negative at higher. The frame-independent coefficient λ˜ is strongly negative at allin all frames. The data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.