A QCD sum rule calculation of the X-+/-(5568) -> B-s(0)pi(+/-) decay width

作者：Dias J M^*; Khemchandani K P; Martinez Torres A; Nielsen M; Zanetti C M

来源：Physics Letters B, 2016, 758: 235-238.

DOI：10.1016/j.physletb.2016.05.015

To understand the nature of the X(5568), recently observed in the mass spectrum of the B-s(0)pi(+/-) system by the D0 Collaboration, we have investigated, in a previous work, a scalar tetraquark (diquak-antidiquark) structure for it, within the two-point QCD sum rules method. We found that it is possible to obtain a stable value of the mass compatible with the D0 result, although a rigorous QCD sum rule constrained analysis led to a higher value of mass. As a continuation of our investigation, we calculate the width of the tetraquark state with same quark content as X(5568), to the channel B-s(0)pi(+/-), using the three-point QCD sum rule. We obtain a value of (20.4 +/- 8.7) MeV for the mass similar to 5568 MeV, which is compatible with the experimental value of 21.9 +/- 6.4(sta)(-2.5)(+5.0)(syst) MeV/c(2). We find that the decay width to B-s(0)pi(+/-) does not alter much for a higher mass state.

• 出版日期2016-7-10