P-wave excited B-c meson photoproduction at the LHeC
P-wave excited B-c meson photoproduction at the LHeC
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P 波激发 LHeC 的 $B_c^{}$ 介子照片制作
DOI：
10.1088/1361-6471/aab37f
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Wen-Gan Ma
中科院分区：
文献类型：
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作者：
Kai He;Huan-Yu Bi;Ren-You Zhang;Xiao-Zhou Li;Wen-Gan Ma
作为大型强子电子对撞机（LHeC）上S波Bc（SS 1 0 3 1）介子产生的重要后续工作，我们在非相对论QCD框架下研究了LHeC上P波激发Bc态（1 P1和3 PJ，其中J=10，1，2）的光生机制产生.由于胶子具有很高的发光度，一般认为电子质子对撞机上的主要产生机制是 ** g+ π + π ++-ePgB B cc过程。然而，根据我们在LHeC上S波 *（）Bc介子产生的经验，在低pT区，外生机制，即 ** g+ n + n +-ePc B B c和g+ n + n + n-ePc B b**+ B cc，也能提供主要贡献.这些通道之间进行仔细的治疗和结果的总截面和微分截面，连同主要的不确定性进行了讨论。考虑夸克质量mb= 4.90±0.40 GeV和mc= 1.50±0.20 GeV，并将所有产生通道相加，我们期望累积 **-+（）（）B P 2.48 10 c 1.75 3.55 4 1 1，**-+（）（）B P 1.14 10，c 0.82 1.49 4 0 3
As an important sequential work of the S-wave*() Bc (() SS 1 0 3 1) meson production at the large hadron electron collider (LHeC), we investigate the production of the P-wave excited** Bc states (1P1 and 3PJ with J= 0, 1, 2) via photoproduction mechanism within the framework of nonrelativistic QCD at the LHeC. Generally, the** g++++-e P g B b c c process is considered as the main production mechanism at an electron–proton collider due to the large luminosity of the gluon. However, according to our experience on the S-wave*() Bc meson production at the LHeC, the extrinsic production mechanism, ie,** g+++-e P c B b c and g++-e P b**+ B c c, could also provide dominating contributions at low pT region. A careful treatment between these channels is performed and the results on total and differential cross sections, together with main uncertainties are discussed. Taking the quark masses mb= 4.90±0.40 GeV and mc= 1.50±0.20 GeV into account and summing up all the production channels, we expect to accumulate**-+()() B P 2.48 10 c 1.75 3.55 4 1 1,**-+()() B P 1.14 10, c 0.82 1.49 4 0 3