Line shapes in Υ(5S)→B(* )B ̄ (* )π with Z(10610) and Z(10650) using effective field theory

Journal Article (Journal Article)

The Belle Collaboration recently discovered two resonances, Z b(10610) and Zb(10650) - denoted Zb and Zb′ - in the decays Υ(5S)→Υ(nS)π+π - for n=1, 2, or 3, and Υ(5S)→hb(mP) π+π- for m=1 or 2. These resonances lie very close to the B*B̄ and B*B̄* thresholds, respectively. A recent Belle analysis of the three-body decays Υ(5S)→[B(*)B̄( *)]â̂π± gives further evidence for the existence of these states. In this paper we analyze this decay using an effective theory of B mesons interacting via strong short-range interactions. Some parameters in this theory are constrained using existing data on Υ(5S)→B(*)B̄( *) decays, which requires the inclusion of heavy quark spin symmetry violating operators. We then calculate the differential distribution for Υ(5S)→B(*)B̄(*) π as a function of the invariant mass of the B(*)B ̄(*) pair, obtaining qualitative agreement with experimental data. We also calculate angular distributions in the decay Υ(5S)→Zb(′)π which are sensitive to the molecular character of the Zb(′). © 2013 American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Mehen, T; Powell, JW

Published Date

  • August 8, 2013

Published In

Volume / Issue

  • 88 / 3

Electronic International Standard Serial Number (EISSN)

  • 1550-2368

International Standard Serial Number (ISSN)

  • 1550-7998

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.88.034017

Citation Source

  • Scopus