arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0710.5482hep-ph
收藏

荷电粲介子对X(3872)谱线的影响

The Effects of Charged Charm Mesons on the Line Shapes of the X(3872)

Eric Braaten, Meng Lu

摘要:

X(3872)的量子数J^PC = 1++和它的质量接近D*0反D 0阈值意味着它要么是一个松散束缚的强子分子,其成分是D*0反D 0和D 0反D *0的叠加,要么是一个虚的粲介子态。X(3872)的线形可以区分这两种可能性。在D*0 anti-D 0阈值的几MeV内的能量下,在B -> K跃迁中产生的X的线形由其结合能和宽度决定。它们的归一化由短距离常数确定,该常数对于B+ -> K+和B 0-> K 0是不同的。在D*0反D 0和D*+ D-阈值之间的8 MeV分裂能量相当时,带电介子通道D*+ D-和D+ D*-对X射线的线形有显著影响。我们考虑到带电和中性1++通道之间的谐振耦合来计算线形。线的形状和它们的归一化依赖于一个额外的散射参数和两个额外的短距离常数与B -> K跃迁。X共振的线形取决于它的衰变通道;它们对于J/psi pi+ pi-、J/psi pi+ pi-pi 0和D 0 anti-D 0 pi 0是不同的。在B+衰变和B 0衰变中产生的X的线形也不同。一些概念上的错误,在以前的工作在这个问题上指出。

英文摘要:

The quantum numbers J^PC = 1++ of the X(3872) and the proximity of its mass to the D*0 anti-D0 threshold imply that it is either a loosely-bound hadronic molecule whose constituents are a superposition of D*0 anti-D0 and D0 anti-D*0 or it is a virtual state of charm mesons. The line shapes of the X(3872) can discriminate between these two possibilities. At energies within a few MeV of the D*0 anti-D0 threshold, the lines shapes of the X produced in B -> K transitions are determined by its binding energy and its width. Their normalizations are determined by a short-distance constant that is different for B+ -> K+ and B0 -> K0. At energies comparable to the 8 MeV splitting between the D*0 anti-D0 and D*+ D- thresholds, the charged meson channels D*+ D- and D+ D*- have a significant effect on the line shapes of the X. We calculate the line shapes taking into account the resonant coupling between the charged and neutral 1++ channels. The line shapes and their normalizations depend on one additional scattering parameter and two additional short-distance constants associated with the B -> K transitions. The line shapes of the X resonance depend on its decay channel; they are different for J/psi pi+ pi-, J/psi pi+ pi- pi0, and D0 anti-D0 pi0. The line shapes are also different for X produced in B+ decays and in B0 decays. Some conceptual errors in previous work on this problem are pointed out.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑