An estimate of the branching fraction of tau -> pi eta 'nu(tau)

作者：Nussinov S^*; Soffer A

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, 80(3): 033010.

DOI：10.1103/PhysRevD.80.033010

We calculate the expected branching fraction of the second-class-current decay tau -> pi eta 'nu(tau), motivated by a recent experimental upper-limit determination of this quantity. The largest contribution to the branching fraction is due to the intermediate a(0)(980) scalar meson, assuming it is a (u) over bard state. Smaller contributions arise from a(0)(1450), rho(770), and rho(1450). Our calculated values are substantially below the experimental upper limit, and are smaller still if the a(0)(980) is a four-quark state, as often suggested. Thus, a precise measurement or tight upper limit has the potential to determine the nature of the a(0)(980), as well as provide information about new scalar interactions.

• 出版日期2009-8