Additional information on heavy quark parameters from charged lepton forward-backward asymmetry

作者：Turczyk Sascha^*

来源：The Journal of High Energy Physics, 2016, 2016(4): 131.

DOI：10.1007/JHEP04(2016)131

• Heavy Quark Physics
• Nonperturbative Effects
• Effective field theories

The determination of vertical bar V-cb vertical bar using inclusive and exclusive (semi-)1eptonic decays exhibits a long-standing tension of varying 0(3 sigma) significance. For the inclusive determination the decay rate is expanded in 1/m(b) using heavy quark expansion, and from moments of physical observables the higher order heavy quark parameters are extracted from experimental data in order to assess vertical bar V-cb vertical bar from the normalisation. The drawbacks are high correlations both theoretically as well as experimentally among these observables. We will scrutinise the inclusive determination in order to add a new and less correlated observable. This observable is related to the decay angle of the charged lepton and can help to constrain the important heavy quark parameters in a new way. It may validate the current seemingly stable extraction of vertical bar V-cb vertical bar from inclusive decays or hints to possible issues, and even may be sensitive to New Physics operators.

• 出版日期2016-4-20