Effects of Zb states and bottom meson loops on ϒ(4S)ϒ(1S,2S)π+π transitions

Yun-Hua Chen, Martin Cleven, Johanna T. Daub, Feng-Kun Guo, Christoph Hanhart, Bastian Kubis, Ulf-G. Meißner, and Bing-Song Zou
Phys. Rev. D 95, 034022 – Published 21 February 2017

Abstract

We study the dipion transitions ϒ(4S)ϒ(nS)π+π(n=1,2). In particular, we consider the effects of the two intermediate bottomoniumlike exotic states Zb(10610) and Zb(10650) as well as bottom meson loops. The strong pion-pion final-state interactions, especially including channel coupling to KK¯ in the S wave, are taken into account model independently by using dispersion theory. Based on a nonrelativistic effective field theory we find that the contribution from the bottom meson loops is comparable to those from the chiral contact terms and the Zb-exchange terms. For the ϒ(4S)ϒ(2S)π+π decay, the result shows that including the effects of the Zb exchange and the bottom meson loops can naturally reproduce the two-hump behavior of the ππ mass spectra. Future angular distribution data are decisive for the identification of different production mechanisms. For the ϒ(4S)ϒ(1S)π+π decay, we show that there is a narrow dip around 1 GeV in the ππ invariant mass distribution, caused by the final-state interactions. The distribution is clearly different from that in similar transitions from lower ϒ states, and needs to be verified by future data with high statistics. Also we predict the decay width and the dikaon mass distribution of the ϒ(4S)ϒ(1S)K+K process.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 4 November 2016

DOI:https://doi.org/10.1103/PhysRevD.95.034022

© 2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Particles & Fields

Authors & Affiliations

Yun-Hua Chen1, Martin Cleven2, Johanna T. Daub1, Feng-Kun Guo3,4, Christoph Hanhart5, Bastian Kubis1, Ulf-G. Meißner1,5, and Bing-Song Zou3,4

  • 1Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany
  • 2Departament de Fisica Quantica i Astrofisica Universitat de Barcelona, 08028 Barcelona, Spain
  • 3CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 5Institut für Kernphysik, Institute for Advanced Simulation, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425 Jülich, Germany

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 95, Iss. 3 — 1 February 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×