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Evidence of a structure in $$\bar{K}^{0} \Lambda _{c}^{+}$$ K ¯ 0 Λ c + consistent with a charged $$\Xi _c(2930)^{+}$$ Ξ c ( 2930 ) + , and updated measurement of $$\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B ¯ 0 → K ¯ 0 Λ c + Λ ¯ c - at Belle

Authors :
B. Bhuyan
S. Uno
J. Libby
D. M. Asner
T. E. Browder
K. Hayasaka
A. Bobrov
M. Nayak
V. Savinov
Y. Seino
G. Schnell
Y. Ban
Y. Yusa
S. H. Kim
Shoichi Watanuki
A. Chen
P. Krokovny
V.N. Zhilich
Y. Kato
K. H. Kang
K. Cho
M. Uchida
L. K. Li
H. Ono
R. Mizuk
P. Pakhlov
T. V. Dong
Y. Choi
D. Matvienko
S. K. Choi
D. Liventsev
V. Bhardwaj
S. Pardi
U. Tamponi
Vladimir Zhulanov
K. J. Nath
Y. Jin
I. Jaegle
S. Jia
R. Kroeger
S. Okuno
L. Santelj
C. H. Wang
H. Ye
S. Nishida
I. Badhrees
M. E. Sevior
I. S. Lee
G. S. Varner
P. Goldenzweig
S. Sandilya
D. Epifanov
M. Z. Wang
K. Kinoshita
K. Chilikin
Y. Sakai
Jochen Dingfelder
H. Park
Vikas Bansal
A. Bozek
T. Iijima
B. Pal
Vladimir Popov
C. P. Shen
A. Rostomyan
P. Wang
E. Nakano
V. Gaur
M. Starič
Y. Unno
V. Babu
B. G. Fulsom
J. H. Yin
Soumen Paul
T. K. Pedlar
T. Kuhr
T. Aushev
R. Pestotnik
Shih-Chang Lee
C. Van Hulse
D. Cinabro
J. Haba
I. Adachi
Z. Drásal
Youngjoon Kwon
G. Inguglia
V. Zhukova
B. Golob
A. B. Kaliyar
P. Chang
Tao Luo
K. Tanida
J. B. Kim
C. Beleño
K. K. Joo
X. L. Wang
E. Solovieva
H. K. Moon
J. S. Lange
V. Chekelian
M. Gelb
Somnath Choudhury
T. Kawasaki
N. Dash
Y. Iwasaki
M. Sumihama
R. Van Tonder
Bingran Wang
Kohei Ogawa
O. Schneider
E. Won
D. Kotchetkov
K. Inami
S. Al Said
R. Ayad
Seema Bahinipati
M. Takizawa
C. Z. Yuan
E. Prencipe
G.V. Russo
D. Y. Kim
M. Merola
W. S. Hou
C. Schwanda
John Yelton
Z. Doležal
V. Vorobyev
Peter Kodys
W. W. Jacobs
K. Senyo
O. Seon
E. Waheed
Tara Nanut
T. Uglov
Z. Natkaniec
S. Di Carlo
N. Gabyshev
D. Červenkov
A. K. Giri
Rocky Bala Garg
Eberhard Widmann
A. Garmash
G. Pakhlova
L. Cao
L. Li Gioi
M. Bračko
Jyoti Prakash Biswal
J. F. Strube
Kevin Varvell
T. Mori
H. Aihara
Y. Usov
N. K. Nisar
Z. P. Zhang
M. Iwasaki
B. G. Cheon
R. Itoh
S. Korpar
J. G. Shiu
Y. B. Li
K. Nishimura
James E. Fast
R. Mussa
H. B. Jeon
A. Ishikawa
P. Križan
S. Hirose
T. A. Shibata
H. Miyata
Prafulla Kumar Behera
S.I. Eidelman
S. Cunliffe
M. Salehi
F. Tenchini
T. Sumiyoshi
T. Sanuki
L. E. Piilonen
Source :
The European Physical Journal C. 78
Publication Year :
2018
Publisher :
Springer Science and Business Media LLC, 2018.

Abstract

We report evidence for the charged charmed-strange baryon $$\Xi _{c}(2930)^+$$ with a signal significance of 3.9 $$\sigma $$ with systematic errors included. The charged $$\Xi _{c}(2930)^+$$ is found in its decay to $$K_{S}^{0} \Lambda _{c}^+$$ in the substructure of $$\bar{B}^{0} \rightarrow K^{0}_{S} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ decays. The measured mass and width are $$[2942.3 \pm 4.4 ({\mathrm{stat.}}) \pm {1.5}({\mathrm{syst.}})]$$ MeV/ $$c^{2}$$ and $$[14.8 \pm 8.8({\mathrm{stat.}}) \pm {2.5}({\mathrm{syst.}})]$$ MeV, respectively, and the product branching fraction is $$\mathcal{B}(\bar{B}^{0} \rightarrow \Xi _c(2930)^{+} \bar{\Lambda }_{c}^{-}) \mathcal{B}(\Xi _c(2930)^{+}\rightarrow \bar{K}^{0} \Lambda _{c}^{+})=[2.37 \pm 0.51 ({\mathrm{stat.}})\pm 0.31({\mathrm{syst.}})]\times 10^{-4}$$ . We also measure $$\mathcal{B}(\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}) = [3.99 \pm 0.76({\mathrm{stat.}}) \pm 0.51({\mathrm{syst.}})] \times 10^{-4}$$ with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y(4660) and its spin partner, $$Y_{\eta }$$ , in the $$\Lambda _{c}^{+}\bar{\Lambda }_{c}^{-}$$ invariant mass spectrum. No clear signals of the Y(4660) or $$Y_{\eta }$$ are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $$(772\pm 11)\times 10^{6} B\bar{B}$$ pairs collected at the $$\Upsilon (4S)$$ resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

Details

ISSN :
14346052 and 14346044
Volume :
78
Database :
OpenAIRE
Journal :
The European Physical Journal C
Accession number :
edsair.doi...........55fa57a5de21609bde72f38d180c5d73
Full Text :
https://doi.org/10.1140/epjc/s10052-018-6425-5