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Search for $B^+ o mu^+,
u_mu$ and $B^+ o mu^+, N$ with inclusive tagging | | M. T. Prim
; F.U. Bernlochner
; P. Goldenzweig
; M. Heck
; I. Adachi
; K. Adamczyk
; H. Aihara
; S. Al Said
; D. M. Asner
; H. Atmacan
; V. Aulchenko
; T. Aushev
; R. Ayad
; V. Babu
; A. M. Bakich
; V. Bansal
; P. Behera
; C. Beleño
; V. Bhardwaj
; B. Bhuyan
; T. Bilka
; J. Biswal
; A. Bobrov
; A. Bozek
; M. Bračko
; N. Braun
; T. E. Browder
; M. Campajola
; L. Cao
; D. Červenkov
; P. Chang
; V. Chekelian
; A. Chen
; B. G. Cheon
; K. Chilikin
; H. E. Cho
; K. Cho
; Y. Choi
; S. Choudhury
; D. Cinabro
; S. Cunliffe
; Z. Doležal
; S. Eidelman
; D. Epifanov
; J. E. Fast
; T. Ferber
; B. G. Fulsom
; R. Garg
; V. Gaur
; A. Garmash
; A. Giri
; O. Grzymkowska
; Y. Guan
; J. Haba
; T. Hara
; K. Hayasaka
; H. Hayashii
; W.-S. Hou
; T. Iijima
; K. Inami
; G. Inguglia
; A. Ishikawa
; M. Iwasaki
; Y. Iwasaki
; S. Jia
; Y. Jin
; D. Joffe
; K. K. Joo
; A. B. Kaliyar
; G. Karyan
; T. Kawasaki
; H. Kichimi
; C. Kiesling
; C. H. Kim
; D. Y. Kim
; K. T. Kim
; S. H. Kim
; K. Kinoshita
; P. Kodyš
; S. Korpar
; D. Kotchetkov
; P. Križan
; R. Kroeger
; P. Krokovny
; T. Kuhr
; R. Kulasiri
; R. Kumar
; T. Kumita
; A. Kuzmin
; Y.-J. Kwon
; K. Lalwani
; J. S. Lange
; I. S. Lee
; J. K. Lee
; J. Y. Lee
; S. C. Lee
; P. Lewis
; C. H. Li
; L. Li Gioi
; J. Libby
; K. Lieret
; D. Liventsev
; P.-C. Lu
; T. Luo
; J. MacNaughton
; M. Masuda
; T. Matsuda
; D. Matvienko
; M. Merola
; F. Metzner
; K. Miyabayashi
; R. Mizuk
; G. B. Mohanty
; R. Mussa
; M. Nakao
; G. De Nardo
; K. J. Nath
; Z. Natkaniec
; M. Nayak
; M. Niiyama
; N. K. Nisar
; S. Nishida
; K. Nishimura
; S. Ogawa
; H. Ono
; Y. Onuki
; P. Pakhlov
; G. Pakhlova
; B. Pal
; S. Pardi
; H. Park
; S.-H. Park
; S. Patra
; S. Paul
; T. K. Pedlar
; R. Pestotnik
; L. E. Piilonen
; V. Popov
; E. Prencipe
; M. Ritter
; A. Rostomyan
; M. Rozanska
; G. Russo
; D. Sahoo
; Y. Sakai
; L. Santelj
; V. Savinov
; O. Schneider
; G. Schnell
; J. Schueler
; C. Schwanda
; Y. Seino
; K. Senyo
; M. E. Sevior
; V. Shebalin
; J.-G. Shiu
; B. Shwartz
; F. Simon
; A. Sokolov
; E. Solovieva
; M. Starič
; J. F. Strube
; M. Sumihama
; T. Sumiyoshi
; W. Sutcliffe
; M. Takizawa
; U. Tamponi
; Y. Tao
; F. Tenchini
; M. Uchida
; T. Uglov
; Y. Unno
; S. Uno
; Y. Ushiroda
; Y. Usov
; S. E. Vahsen
; R. Van Tonder
; G. Varner
; K. E. Varvell
; A. Vinokurova
; B. Wang
; C. H. Wang
; M.-Z. Wang
; P. Wang
; S. Watanuki
; E. Won
; S. B. Yang
; H. Ye
; J. H. Yin
; Y. Yusa
; Z. P. Zhang
; V. Zhilich
; V. Zhukova
; V. Zhulanov
; | | Date: |
8 Nov 2019 | | Abstract: | We report the result for a search for the leptonic decay of $B^+ o mu^+ ,
u_{mu}$ using the full Belle data set of 711 fb${}^{-1}$ of integrated
luminosity at the $Upsilon(4S)$ resonance. In the Standard Model leptonic
$B$-meson decays are helicity and CKM suppressed. To maximize sensitivity an
inclusive tagging approach is used to reconstruct the second $B$ meson produced
in the collision. The directional information from this second $B$ meson is
used to boost the observed $mu$ into the signal $B$ meson rest-frame, in which
the $mu$ has a monochromatic momentum spectrum. Though its momentum is smeared
by the experimental resolution, this technique improves the analysis
sensitivity considerably. Analyzing the $mu$ momentum spectrum in this frame
we find $mathcal{B}(B^+ o mu^+ ,
u_mu) = left( 5.3 pm 2.0 pm 0.9
ight) imes 10^{-7}$ with a one-sided significance of 2.8 standard
deviations over the background-only hypothesis. This translates to a
frequentist upper limit of $mathcal{B}(B^+ o mu^+ ,
u_{mu}) < 8.6
imes 10^{-7}$ at 90% CL. The experimental spectrum is then used to search for
a massive sterile neutrino, $B^+ o mu^+ , N$, but no evidence is observed
for a sterile neutrino with a mass in a range of 0 - 1.5 GeV. The determined
$B^+ o mu^+ ,
u_{mu}$ branching fraction limit is further used to
constrain the mass and coupling space of the type II and type III
two-Higgs-doublet models. | | Source: | arXiv, 1911.3186 | | Services: | Forum | Review | PDF | Favorites | |
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