Improved measurement of the branching fraction and energy spectrum of η′ from Υ(1S) decays
- ,
- Z. Li,
- A. Lopez,
- S. Mehrabyan,
- H. Mendez,
- J. Ramirez
- University of Puerto Rico,
- Purdue University,
- Rensselaer Polytechnic Institute,
- University of Rochester,
- Southern Methodist University,
- Syracuse University
Research Output: Contribution to journal Article Peer-review
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44
Abstract
We present an improved measurement of the η′ meson energy spectrum in Υ(1S) decays, using 1.2fb-1 of data taken at the Υ(1S) center-of-mass energy with the CLEO III detector. We compare our results with models of the η′ gluonic form factor that have been suggested to explain the unexpectedly large B→η′Xs rate. Models based on perturbative QCD fail to fit the data for large η′ energies, and thus an explanation outside the realm of the Standard Model or an improved understanding of nonperturbative QCD effects may be needed to account for this large rate.
Publication Information
Output type
Research Output: Contribution to journal Article Peer-review
Original language
EnglishArticle number
092006Journal (Volume, Issue Number)
Physical Review D - Particles, Fields, Gravitation and Cosmology (Volume 74, Issue 9)Publication milestones
- Published - 06/12/2006
Publication status
Published - 06/12/2006
ISSN
1550-7998Publication IDs
- Scopus: 33751541177
- WOS: 000242409700011