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Journal Articles JHEP Year : 2021

Test of lepton flavor universality and search for lepton flavor violation in $B \rightarrow K\ell \ell$ decays

S. Choudhury , S. Sandilya , K. Trabelsi (1) , A. Giri , H. Aihara , S. Al Said , D.M. Asner , H. Atmacan , V. Aulchenko , T. Aushev , R. Ayad , V. Babu , S. Bahinipati , P. Behera , C. Beleño , K. Belous , J. Bennett , F. Bernlochner , M. Bessner , V. Bhardwaj , T. Bilka , J. Biswal , G. Bonvicini , A. Bozek , M. Bračko , T.E. Browder , M. Campajola , D. Červenkov , M.-C. Chang , P. Chang , V. Chekelian , A. Chen , B.G. Cheon , K. Chilikin , K. Cho , S.-K. Choi , Y. Choi , D. Cinabro , S. Cunliffe , N. Dash , G. De Nardo , R. Dhamija , F. Di Capua , J. Dingfelder , Z. Doležal , T.V. Dong , D. Dossett , S. Dubey , S. Eidelman , D. Epifanov , T. Ferber , D. Ferlewicz , B.G. Fulsom , R. Garg , V. Gaur , N. Gabyshev , A. Garmash , P. Goldenzweig , B. Golob , D. Greenwald , C. Hadjivasiliou , O. Hartbrich , H. Hayashii , M.T. Hedges , M. Hernandez Villanueva , T. Higuchi , W.-S. Hou , C.-L. Hsu , T. Iijima , K. Inami , A. Ishikawa , R. Itoh , M. Iwasaki , Y. Iwasaki , W.W. Jacobs , E.-J. Jang , H.B. Jeon , S. Jia , Y. Jin , C.W. Joo , K.K. Joo , J. Kahn , A.B. Kaliyar , K.H. Kang , G. Karyan , H. Kichimi , C. Kiesling , B.H. Kim , D.Y. Kim , K.-H. Kim , K.T. Kim , S.H. Kim , Y.-K. Kim , K. Kinoshita , P. Kodyš , S. Korpar , D. Kotchetkov , P. Križan , R. Kroeger , P. Krokovny , T. Kuhr , R. Kulasiri , R. Kumar , K. Kumara , A. Kuzmin , Y.-J. Kwon , K. Lalwani , S.C. Lee , P. Lewis , C.H. Li , L.K. Li , Y.B. Li , L. Li Gioi , J. Libby , K. Lieret , Z. Liptak , D. Liventsev , T. Luo , M. Masuda , T. Matsuda , D. Matvienko , M. Merola , K. Miyabayashi , R. Mizuk , G.B. Mohanty , S. Mohanty , T.J. Moon , T. Mori , I. Nakamura , K.R. Nakamura , M. Nakao , Z. Natkaniec , A. Natochii , L. Nayak , M. Nayak , M. Niiyama , N.K. Nisar , S. Nishida , K. Ogawa , H. Ono , Y. Onuki , P. Oskin , P. Pakhlov , G. Pakhlova , S. Pardi , H. Park , S.-H. Park , S. Patra , S. Paul , T.K. Pedlar , R. Pestotnik , L.E. Piilonen , T. Podobnik , V. Popov , E. Prencipe , M.T. Prim , A. Rabusov , A. Rostomyan , N. Rout , M. Rozanska , G. Russo , D. Sahoo , Y. Sakai , L. Santelj , T. Sanuki , V. Savinov , G. Schnell , J. Schueler , C. Schwanda , A.J. Schwartz , Y. Seino , K. Senyo , M.E. Sevior , M. Shapkin , V. Shebalin , J.-G. Shiu , B. Shwartz , F. Simon , A. Sokolov , E. Solovieva , S. Stanič , M. Starič , Z.S. Stottler , T. Sumiyoshi , W. Sutcliffe , M. Takizawa , U. Tamponi , K. Tanida , F. Tenchini , M. Uchida , S. Uehara , T. Uglov , Y. Unno , S. Uno , P. Urquijo , Y. Ushiroda , R. van Tonder , G. Varner , K.E. Varvell , A. Vinokurova , V. Vorobyev , E. Waheed , C.H. Wang , E. Wang , M.-Z. Wang , P. Wang , M. Watanabe , S. Watanuki (1) , S. Wehle , J. Wiechczynski , E. Won , X. Xu , B.D. Yabsley , W. Yan , S.B. Yang , H. Ye , J. Yelton , J.H. Yin , C.Z. Yuan , Y. Yusa , Z.P. Zhang , V. Zhilich , V. Zhukova
S. Choudhury
  • Function : Author
S. Sandilya
  • Function : Author
A. Giri
  • Function : Author
H. Aihara
  • Function : Author
S. Al Said
  • Function : Author
D.M. Asner
  • Function : Author
H. Atmacan
  • Function : Author
V. Aulchenko
  • Function : Author
T. Aushev
  • Function : Author
R. Ayad
  • Function : Author
V. Babu
  • Function : Author
S. Bahinipati
  • Function : Author
P. Behera
  • Function : Author
C. Beleño
  • Function : Author
K. Belous
  • Function : Author
J. Bennett
  • Function : Author
F. Bernlochner
  • Function : Author
M. Bessner
  • Function : Author
V. Bhardwaj
  • Function : Author
T. Bilka
  • Function : Author
J. Biswal
  • Function : Author
G. Bonvicini
  • Function : Author
A. Bozek
  • Function : Author
M. Bračko
  • Function : Author
T.E. Browder
  • Function : Author
M. Campajola
  • Function : Author
D. Červenkov
  • Function : Author
M.-C. Chang
  • Function : Author
P. Chang
  • Function : Author
V. Chekelian
  • Function : Author
A. Chen
  • Function : Author
B.G. Cheon
  • Function : Author
K. Chilikin
  • Function : Author
K. Cho
  • Function : Author
S.-K. Choi
  • Function : Author
Y. Choi
  • Function : Author
D. Cinabro
  • Function : Author
S. Cunliffe
  • Function : Author
N. Dash
  • Function : Author
G. De Nardo
  • Function : Author
R. Dhamija
  • Function : Author
F. Di Capua
  • Function : Author
J. Dingfelder
  • Function : Author
Z. Doležal
  • Function : Author
T.V. Dong
  • Function : Author
D. Dossett
  • Function : Author
S. Dubey
  • Function : Author
S. Eidelman
  • Function : Author
D. Epifanov
  • Function : Author
T. Ferber
  • Function : Author
D. Ferlewicz
  • Function : Author
B.G. Fulsom
  • Function : Author
R. Garg
  • Function : Author
V. Gaur
  • Function : Author
N. Gabyshev
  • Function : Author
A. Garmash
  • Function : Author
P. Goldenzweig
  • Function : Author
B. Golob
  • Function : Author
D. Greenwald
  • Function : Author
C. Hadjivasiliou
  • Function : Author
O. Hartbrich
  • Function : Author
H. Hayashii
M.T. Hedges
  • Function : Author
M. Hernandez Villanueva
  • Function : Author
T. Higuchi
  • Function : Author
W.-S. Hou
  • Function : Author
C.-L. Hsu
  • Function : Author
T. Iijima
  • Function : Author
K. Inami
  • Function : Author
A. Ishikawa
  • Function : Author
R. Itoh
  • Function : Author
M. Iwasaki
  • Function : Author
Y. Iwasaki
  • Function : Author
W.W. Jacobs
  • Function : Author
E.-J. Jang
  • Function : Author
H.B. Jeon
  • Function : Author
S. Jia
  • Function : Author
Y. Jin
  • Function : Author
C.W. Joo
  • Function : Author
K.K. Joo
  • Function : Author
J. Kahn
  • Function : Author
A.B. Kaliyar
  • Function : Author
K.H. Kang
  • Function : Author
G. Karyan
  • Function : Author
H. Kichimi
  • Function : Author
C. Kiesling
  • Function : Author
B.H. Kim
  • Function : Author
D.Y. Kim
  • Function : Author
K.-H. Kim
  • Function : Author
K.T. Kim
  • Function : Author
S.H. Kim
  • Function : Author
Y.-K. Kim
  • Function : Author
K. Kinoshita
  • Function : Author
P. Kodyš
  • Function : Author
S. Korpar
  • Function : Author
D. Kotchetkov
  • Function : Author
P. Križan
  • Function : Author
R. Kroeger
  • Function : Author
P. Krokovny
  • Function : Author
T. Kuhr
  • Function : Author
R. Kulasiri
  • Function : Author
R. Kumar
  • Function : Author
K. Kumara
  • Function : Author
A. Kuzmin
  • Function : Author
Y.-J. Kwon
  • Function : Author
K. Lalwani
  • Function : Author
S.C. Lee
  • Function : Author
P. Lewis
  • Function : Author
C.H. Li
  • Function : Author
L.K. Li
  • Function : Author
Y.B. Li
  • Function : Author
L. Li Gioi
  • Function : Author
J. Libby
  • Function : Author
K. Lieret
  • Function : Author
Z. Liptak
  • Function : Author
D. Liventsev
  • Function : Author
T. Luo
  • Function : Author
M. Masuda
  • Function : Author
T. Matsuda
  • Function : Author
D. Matvienko
  • Function : Author
M. Merola
  • Function : Author
K. Miyabayashi
  • Function : Author
R. Mizuk
  • Function : Author
G.B. Mohanty
  • Function : Author
S. Mohanty
  • Function : Author
T.J. Moon
  • Function : Author
T. Mori
  • Function : Author
I. Nakamura
  • Function : Author
K.R. Nakamura
  • Function : Author
M. Nakao
  • Function : Author
Z. Natkaniec
  • Function : Author
A. Natochii
  • Function : Author
L. Nayak
  • Function : Author
M. Nayak
  • Function : Author
M. Niiyama
  • Function : Author
N.K. Nisar
  • Function : Author
S. Nishida
  • Function : Author
K. Ogawa
  • Function : Author
H. Ono
  • Function : Author
Y. Onuki
  • Function : Author
P. Oskin
  • Function : Author
P. Pakhlov
  • Function : Author
G. Pakhlova
  • Function : Author
S. Pardi
  • Function : Author
H. Park
  • Function : Author
S.-H. Park
  • Function : Author
S. Patra
  • Function : Author
S. Paul
  • Function : Author
T.K. Pedlar
  • Function : Author
R. Pestotnik
  • Function : Author
L.E. Piilonen
  • Function : Author
T. Podobnik
  • Function : Author
V. Popov
  • Function : Author
E. Prencipe
  • Function : Author
M.T. Prim
  • Function : Author
A. Rabusov
  • Function : Author
A. Rostomyan
  • Function : Author
N. Rout
  • Function : Author
M. Rozanska
  • Function : Author
G. Russo
  • Function : Author
D. Sahoo
  • Function : Author
Y. Sakai
  • Function : Author
L. Santelj
  • Function : Author
T. Sanuki
  • Function : Author
V. Savinov
  • Function : Author
G. Schnell
  • Function : Author
J. Schueler
  • Function : Author
C. Schwanda
  • Function : Author
A.J. Schwartz
  • Function : Author
Y. Seino
  • Function : Author
K. Senyo
  • Function : Author
M.E. Sevior
  • Function : Author
M. Shapkin
  • Function : Author
V. Shebalin
  • Function : Author
J.-G. Shiu
  • Function : Author
B. Shwartz
  • Function : Author
F. Simon
  • Function : Author
A. Sokolov
  • Function : Author
E. Solovieva
  • Function : Author
S. Stanič
  • Function : Author
M. Starič
  • Function : Author
Z.S. Stottler
  • Function : Author
T. Sumiyoshi
  • Function : Author
W. Sutcliffe
  • Function : Author
M. Takizawa
  • Function : Author
U. Tamponi
  • Function : Author
K. Tanida
  • Function : Author
F. Tenchini
  • Function : Author
M. Uchida
  • Function : Author
S. Uehara
  • Function : Author
T. Uglov
  • Function : Author
Y. Unno
  • Function : Author
S. Uno
  • Function : Author
P. Urquijo
  • Function : Author
Y. Ushiroda
  • Function : Author
R. van Tonder
  • Function : Author
G. Varner
  • Function : Author
K.E. Varvell
  • Function : Author
A. Vinokurova
  • Function : Author
V. Vorobyev
  • Function : Author
E. Waheed
  • Function : Author
C.H. Wang
  • Function : Author
E. Wang
  • Function : Author
M.-Z. Wang
  • Function : Author
P. Wang
  • Function : Author
M. Watanabe
  • Function : Author
S. Wehle
  • Function : Author
J. Wiechczynski
  • Function : Author
E. Won
  • Function : Author
X. Xu
  • Function : Author
B.D. Yabsley
  • Function : Author
W. Yan
  • Function : Author
S.B. Yang
  • Function : Author
H. Ye
  • Function : Author
J. Yelton
  • Function : Author
J.H. Yin
  • Function : Author
C.Z. Yuan
  • Function : Author
Y. Yusa
  • Function : Author
Z.P. Zhang
  • Function : Author
V. Zhilich
  • Function : Author
V. Zhukova

Abstract

We present measurements of the branching fractions for the decays B → Kμ$^{+}$μ$^{−}$ and B → Ke$^{+}$e$^{−}$, and their ratio (R$_{K}$), using a data sample of 711 fb$^{−1}$ that contains 772 × 10$^{6} B\overline{B} $ events. The data were collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e$^{+}$e$^{−}$ collider. The ratio R$_{K}$ is measured in five bins of dilepton invariant-mass-squared (q$^{2}$): q$^{2}$ ∈ (0.1, 4.0), (4.00, 8.12), (1.0, 6.0), (10.2, 12.8) and (> 14.18) GeV$^{2}$/c$^{4}$, along with the whole q$^{2}$ region. The R$_{K}$ value for q$^{2}$ ∈ (1.0, 6.0) GeV$^{2}$/c$^{4}$ is $ {1.03}_{-0.24}^{+0.28} $ ± 0.01. The first and second uncertainties listed are statistical and systematic, respectively. All results for R$_{K}$ are consistent with Standard Model predictions. We also measure CP-averaged isospin asymmetries in the same q$^{2}$ bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q$^{2}$ ∈ (1.0, 6.0) GeV$^{2}$/c$^{4}$ bin in the mode with muon final states. The measured differential branching fractions, $ d\mathrm{\mathcal{B}} $/dq$^{2}$, are consistent with theoretical predictions for charged B decays, while the corresponding values are below the expectations for neutral B decays. We have also searched for lepton-flavor-violating B → Kμ$^{±}$e$^{∓}$ decays and set 90% confidence-level upper limits on the branching fraction in the range of 10$^{−8}$ for B$^{+}$ → K$^{+}$μ$^{±}$e$^{∓}$, and B$^{0}$ → K$^{0}$μ$^{±}$e$^{∓}$ modes.[graphic not available: see fulltext]

Dates and versions

hal-02290768 , version 1 (17-09-2019)

Identifiers

Cite

S. Choudhury, S. Sandilya, K. Trabelsi, A. Giri, H. Aihara, et al.. Test of lepton flavor universality and search for lepton flavor violation in $B \rightarrow K\ell \ell$ decays. JHEP, 2021, 03, pp.105. ⟨10.1007/JHEP03(2021)105⟩. ⟨hal-02290768⟩
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