Authors

P. Rubin
C. Cawlfield
B. I. Eisenstein
G. D. Gollin
I. Karliner
D. Kim
N. Lowrey
P. Naik
C. Sedlack
M. Selen
E. J. White
J. Williams
J. Wiss
K. W. Edwards
D. Besson
T. K. Pedlar
D. Cronin-Hennessy
K. Y. Gao
D. T. Gong
J. Hietala
Y. Kubota
T. Klein
B. W. Lang
S. Z. Li
R. Poling
A. W. Scott
A. Smith
S. Dobbs
Z. Metreveli
K. K. Seth
A. Tomaradze
P. Zweber
J. Ernst
A. H. Mahmood
H. Severini
D. M. Asner
S. A. Dytman
W. Love
S. Mehrabyan
J. A. Mueller
V. Savinov
Z. Li
A. Lopez
H. Mendez
J. Ramirez
G. S. Huang
D. H. Miller
V. Pavlunin
B. Sanghi
I. P. J. Shipsey
G. S. Adams
M. Cravey
J. P. Cummings
I. Danko
J. Napolitano
Q. He
H. Muramatsu
C. S. Park
W. Park
E. H. Thorndike
T. E. Coan
Y. S. Gao
F. Liu
M. Artuso
C. Boulahouache
S. Blusk
J. Butt
O. Dorjkhaidav
J. Li
N. Menaa
R. Mountain
R. Nandakumar
K. Randrianarivony
R. Redjimi
R. Sia
T. Skwarnicki
S. Stone
J. C. Wang
K. Zhang
S. E. Csorna
G. Bonvicini
D. Cinabro
M. Dubrovin
R. A. Briere
G. P. Chen
J. Chen
T. Ferguson
G. Tatishvili
H. Vogel
M. E. Watkins
J. L. Rosner
N. E. Adam
J. P. Alexander
K. Berkelman
D. G. Cassel
V. Crede
J. E. Duboscq
K. M. Ecklund
R. Ehrlich
L. Fields
R. S. Galik
L. Gibbons
B. Gittelman
R. Gray
S. W. Gray
D. L. Hartill
B. K. Heltsley
D. Hertz
C. D. Jones
J. Kandaswamy
D. L. Kreinick
V. E. Kuznetsov
H. Mahlke-Kruger
T. O. Meyer
P. U. E. Onyisi
J. R. Patterson
D. Peterson
E. A. Phillips
J. Pivarski
D. Riley
A. Ryd
A. J. Sadoff
H. Schwarthoff
X. Shi
M. R. Shepherd
S. Stroiney
W. M. Sun
D. Urner
T. Wilksen
K. M. Weaver
M. Weinberger
S. B. Athar
P. Avery
L. Breva-Newell
R. Patel
V. Potlia
H. Stoeck
J. Yelton

Published in:

Physical Review D 72,9 (2005) 092004;

Abstract

The spin-singlet P-wave state of charmonium, h(c)(P-1(1)), has been observed in the decay psi(2S)->pi(0)h(c) followed by h(c)->gamma eta(c). Inclusive and exclusive analyses of the M(h(c)) spectrum have been performed. Two complementary inclusive analyses select either a range of energies for the photon emitted in h(c)->gamma eta(c) or a range of values of M(eta(c)). These analyses, consistent with one another within statistics, yield M(h(c))=[3524.9 +/- 0.7 (stat)+/- 0.4 (sys)] MeV/c(2) and a product of the branching ratios B-psi(psi(2S)->pi(0)h(c))xB(h)(h(c)->gamma eta(c))=[3.5 +/- 1.0 (stat)+/- 0.7 (sys)]x10(-4). When the eta(c) is reconstructed in seven exclusive decay modes, 17.5 +/- 4.5 h(c) events are seen with an average mass M(h(c))=[3523.6 +/- 0.9 (stat)+/- 0.5 (sys)] MeV/c(2), and BpsiBh=[5.3 +/- 1.5 (stat)+/- 1.0 (sys)]x10(-4). If combined, the inclusive and exclusive data samples yield an overall mass M(h(c))=[3524.4 +/- 0.6 (stat)+/- 0.4 (sys)] MeV/c(2) and product of branching ratios BpsiBh=[4.0 +/- 0.8 (stat)+/- 0.7 (sys)]x10(-4). The h(c) mass implies a P-wave hyperfine splitting Delta M-HF(1P)equivalent to < M(1(3)P)>-M(1(1)P(1))=[1.0 +/- 0.6 (stat)+/- 0.4 (sys)] MeV/c(2).

Keywords

relativistic quark-model;; heavy-quarkonium;; hadronic transitions;; e&e annihilation;; potential model;; light mesons;; bound-states;; p-states;; qcd;; spectroscopy

Date of this Version

January 2005

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