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Observation of the Dalitz decayDs*+→Ds+e+e−

Authors :
S. Blusk
H. Mendez
D. Peterson
E. H. Thorndike
G. S. Adams
S. W. Gray
Karl Matthew Ecklund
Jonas Rademacker
Hans J. Vogel
Jing Wang
A. Powell
M. Kornicer
G. Bonvicini
J. P. Alexander
C. M. Tarbert
P. Rubin
D. H. Miller
R. A. Briere
Z. Metreveli
C. Thomas
Mark Smith
Peter Onyisi
G. Wilkinson
Souvik Das
Sean A Dobbs
Ping Zhou
I. P.J. Shipsey
D. Hu
D. L. Kreinick
K. Randrianarivony
S. Mehrabyan
A. J. Sadoff
Ting Xiao
H. Muramatsu
B. Xin
P. Naik
D. Z. Besson
C. S. Park
Anders Ryd
D. Cronin-Hennessy
L. K. Gibbons
M. R. Shepherd
Juliet Ritchie Patterson
L. J. Pearson
T. K. Pedlar
K. K. Seth
D. L. Hartill
L. Martin
Sheldon Stone
R. Ehrlich
J. Napolitano
Amiran Tomaradze
Marina Artuso
B. K. Heltsley
J. Zhu
S. Ricciardi
D. Riley
Mats A Selen
Jonathan L. Rosner
Tomasz Skwarnicki
John Yelton
J. Hietala
B. Moziak
D. G. Cassel
A. Lincoln
N. Lowrey
D. Cinabro
J. Insler
J. Libby
G. Tatishvili
Werner Sun
Lei Zhang
J. Y. Ge
James E Wiss
R. E. Mitchell
Xin Shi
V. E. Kuznetsov
K. W. Edwards
R. Mountain
D. M. Asner
Source :
Physical Review D. 86
Publication Year :
2012
Publisher :
American Physical Society (APS), 2012.

Abstract

Using 586 $\textrm{pb}^{-1}$ of $e^{+}e^{-}$ collision data acquired at $\sqrt{s}=4.170$ GeV with the CLEO-c detector at the Cornell Electron Storage Ring, we report the first observation of $D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}$ with a significance of $5.3 \sigma$. The ratio of branching fractions $\calB(D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}) / \calB(D_{s}^{*+} \to D_{s}^{+} \gamma)$ is measured to be $[ 0.72^{+0.15}_{-0.13} (\textrm{stat}) \pm 0.10 (\textrm{syst})]%$, which is consistent with theoretical expectations.

Details

ISSN :
15502368 and 15507998
Volume :
86
Database :
OpenAIRE
Journal :
Physical Review D
Accession number :
edsair.doi...........1fdf7ec99e6b6af95ae64d6599c5515c