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Search for the rare decay of B+→ℓ+νℓγ with improved hadronic tagging

Authors :
Victoria Zhukova
Y. Yusa
J. Gemmler
Eberhard Widmann
J. F. Strube
A. Chen
M. Nayak
M. Gelb
A. Rostomyan
X. L. Wang
G. Varner
B. G. Cheon
V. Chekelian
Ya-Qiu Jin
Jihwa Lee
R. Mizuk
R. Van Tonder
B. K. Pal
M. Takizawa
G. Schnell
S. Al Said
M. Merola
J. Haba
Z. Doležal
R. B. Garg
B. Bhuyan
B. G. Fulsom
W. Sutcliffe
T. Kuhr
V. Babu
K. Chilikin
C. Beleño
D. Y. Kim
J. H. Yin
A. Garmash
Daniel Greenwald
S. C. Lee
T. Ferber
Tagir Aushev
S. K. Choi
S. Uno
V. Savinov
C. Schwanda
Felix Metzner
D. Epifanov
N. K. Nisar
Samo Stanič
V. Bansal
J. G. Shiu
R. Pestotnik
J. S. Lange
K. K. Joo
P. Pakhlov
Phillip Urquijo
Pavel Krokovny
A. Frey
T. Uglov
P. K. Behera
V. V. Zhulanov
Yang Li
K. Senyo
T. Kawasaki
T. K. Pedlar
P. Goldenzweig
T. V. Dong
Y. Choi
Peter Kodys
W. W. Jacobs
K. J. Nath
T. Hara
L. Santelj
Jyoti Prakash Biswal
M. Uchida
F. Tenchini
C. Z. Yuan
W. S. Hou
J. Kahn
C. P. Shen
Semen Eidelman
Seok Kim
S. Sandilya
D. Liventsev
H. Miyata
E. Prencipe
R. Mussa
T. Sumiyoshi
P. C. Lu
G. Russo
V.N. Zhilich
S. Di Carlo
A. Ishikawa
M. Nakao
Martin Ritter
R. Itoh
P. Križan
A. B. Kaliyar
Florian Urs Bernlochner
P. Wang
C. Kiesling
K. Miyabayashi
I. Badhrees
Bo Wang
T. Sanuki
A. K. Giri
M. Starič
G. Pakhlova
S. Nishida
M. Masuda
R. Kulasiri
G. B. Mohanty
Z. Natkaniec
J. Schueler
E. Won
B. Shwartz
L. Cao
A. Bobrov
M. Bračko
H. Atmacan
N. Gabyshev
D. Červenkov
M. Sumihama
Motoki Iwasaki
S. Cunliffe
Y. Iwasaki
O. Schneider
J. K. Lee
V. Gaur
Deepak Kumar Sahoo
M. Niiyama
J. Libby
J. MacNaughton
Kevin Varvell
L. Li Gioi
H. Ye
Y. Tao
T. Mori
H. Aihara
J. E. Fast
Z. P. Zhang
M. Watanabe
S. Jia
T.-A. Shibata
C. H. Wang
S. Paul
K. Inami
M. Mrvar
Leo Piilonen
D. Joffe
H. Hayashii
Hyunyong Kim
S. Zakharov
Seongbae Yang
M. Z. Wang
Nils Braun
O. Seon
Frank Simon
Vladimir Popov
Y. Sakai
N. Dash
E. Solovieva
D. Kotchetkov
Y-J Kwon
R. Kroeger
M. E. Sevior
I. S. Lee
Tao Luo
K. Tanida
H. Kichimi
R. Ayad
K. Cho
S. Pardi
D. Cinabro
Y. Unno
I. Adachi
G. Inguglia
M. Salehi
Somnath Choudhury
D. M. Asner
M. Lubej
K. Hayasaka
Y. Seino
M. T. Prim
Shoichi Watanuki
A. Kuzmin
S. Ogawa
Samo Korpar
H. Yamamoto
Source :
Physical Review D. 98
Publication Year :
2018
Publisher :
American Physical Society (APS), 2018.

Abstract

We present the result of the search for the rare B meson decay of B+ -> l(+)nu e gamma with l = e, mu. For the search the full data set recorded by the Belle experiment of 711 fb(-1) integrated luminosity near the Upsilon(4S) resonance is used. Signal candidates are reconstructed for photon energies E-gamma larger than 1 GeV using a novel multivariate tagging algorithm. The novel algorithm fully reconstructs the second B meson produced in the collision using hadronic modes and was specifically trained to recognize the signal signature in combination with hadronic tag-side B meson decays. This approach greatly enhances the performance. Background processes that can mimic this signature, mainly charmless semileptonic decays and continuum processes, are suppressed using multivariate methods. The number of signal candidates is determined by analyzing the missing mass squared distribution as inferred from the signal side particles and the kinematic properties of the tag-side B meson. No significant excess over the background-only hypothesis is observed and upper limits on the partial branching fraction Delta B with E-gamma > 1 GeV individually for electron and muon final states as well as for the average branching fraction of both lepton final states are reported. We find a Bayesian upper limit of Delta B(B+ -> l(+)nu el) 0.24 GeV at 90% CL.

Details

ISSN :
24700029 and 24700010
Volume :
98
Database :
OpenAIRE
Journal :
Physical Review D
Accession number :
edsair.doi...........6c89f09ac81cad8797822d5a21ac376d
Full Text :
https://doi.org/10.1103/physrevd.98.112016