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Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays

Publication ,  Journal Article
Choudhury, S; Sandilya, S; Trabelsi, K; Giri, A; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; Babu, V ...
Published in: Journal of High Energy Physics
March 2021

We present measurements of the branching fractions for the decays → and → , and their ratio (), using a data sample of 711 fb that contains 772 × 10 events. The data were collected at the ϒ(4) resonance with the Belle detector at the KEKB asymmetric-energy collider. The ratio is measured in five bins of dilepton invariant-mass-squared (): ∈ (01 40) (400 812) (10 60), (102 128) and ( 1418) GeV, along with the whole region. The value for ∈ (10 60) GeV is ± 001. The first and second uncertainties listed are statistical and systematic, respectively. All results for are consistent with Standard Model predictions. We also measure -averaged isospin asymmetries in the same bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the ∈ (10 60) GeV bin in the mode with muon final states. The measured differential branching fractions, , are consistent with theoretical predictions for charged decays, while the corresponding values are below the expectations for neutral decays. We have also searched for lepton-flavor-violating → decays and set 90% confidence-level upper limits on the branching fraction in the range of 10 for → , and → modes.

Duke Scholars

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

March 2021

Volume

2021

Issue

3

Publisher

Springer Science and Business Media LLC

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics
 

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Choudhury, S., Sandilya, S., Trabelsi, K., Giri, A., Aihara, H., Al Said, S., … Zhukova, V. (2021). Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays. Journal of High Energy Physics, 2021(3). https://doi.org/10.1007/jhep03(2021)105
Choudhury, S., S. Sandilya, K. Trabelsi, A. Giri, H. Aihara, S. Al Said, D. M. Asner, et al. “Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays.” Journal of High Energy Physics 2021, no. 3 (March 2021). https://doi.org/10.1007/jhep03(2021)105.
Choudhury S, Sandilya S, Trabelsi K, Giri A, Aihara H, Al Said S, et al. Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays. Journal of High Energy Physics. 2021 Mar;2021(3).
Choudhury, S., et al. “Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays.” Journal of High Energy Physics, vol. 2021, no. 3, Springer Science and Business Media LLC, Mar. 2021. Crossref, doi:10.1007/jhep03(2021)105.
Choudhury S, Sandilya S, Trabelsi K, Giri A, Aihara H, Al Said S, Asner DM, Atmacan H, Aulchenko V, Aushev T, Ayad R, Babu V, Bahinipati S, Behera P, Beleño C, Belous K, Bennett J, Bernlochner F, Bessner M, Bhardwaj V, Bilka T, Biswal J, Bonvicini G, Bozek A, Bračko M, Browder TE, Campajola M, Červenkov D, Chang M-C, Chang P, Chekelian V, Chen A, Cheon BG, Chilikin K, Cho K, Choi S-K, Choi Y, Cinabro D, Cunliffe S, Dash N, De Nardo G, Dhamija R, Di Capua F, Dingfelder J, Doležal Z, Dong TV, Dossett D, Dubey S, Eidelman S, Epifanov D, Ferber T, Ferlewicz D, Fulsom BG, Garg R, Gaur V, Gabyshev N, Garmash A, Goldenzweig P, Golob B, Greenwald D, Hadjivasiliou C, Hartbrich O, Hayashii H, Hedges MT, Hernandez Villanueva M, Higuchi T, Hou W-S, Hsu C-L, Iijima T, Inami K, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Jacobs WW, Jang E-J, Jeon HB, Jia S, Jin Y, Joo CW, Joo KK, Kahn J, Kaliyar AB, Kang KH, Karyan G, Kichimi H, Kiesling C, Kim BH, Kim DY, Kim K-H, Kim KT, Kim SH, Kim Y-K, Kinoshita K, Kodyš P, Korpar S, Kotchetkov D, Križan P, Kroeger R, Krokovny P, Kuhr T, Kulasiri R, Kumar R, Kumara K, Kuzmin A, Kwon Y-J, Lalwani K, Lee SC, Lewis P, Li CH, Li LK, Li YB, Li Gioi L, Libby J, Lieret K, Liptak Z, Liventsev D, Luo T, Masuda M, Matsuda T, Matvienko D, Merola M, Miyabayashi K, Mizuk R, Mohanty GB, Mohanty S, Moon TJ, Mori T, Nakamura I, Nakamura KR, Nakao M, Natkaniec Z, Natochii A, Nayak L, Nayak M, Niiyama M, Nisar NK, Nishida S, Ogawa K, Ono H, Onuki Y, Oskin P, Pakhlov P, Pakhlova G, Pardi S, Park H, Park S-H, Patra S, Paul S, Pedlar TK, Pestotnik R, Piilonen LE, Podobnik T, Popov V, Prencipe E, Prim MT, Rabusov A, Rostomyan A, Rout N, Rozanska M, Russo G, Sahoo D, Sakai Y, Santelj L, Sanuki T, Savinov V, Schnell G, Schueler J, Schwanda C, Schwartz AJ, Seino Y, Senyo K, Sevior ME, Shapkin M, Shebalin V, Shiu J-G, Shwartz B, Simon F, Sokolov A, Solovieva E, Stanič S, Starič M, Stottler ZS, Sumiyoshi T, Sutcliffe W, Takizawa M, Tamponi U, Tanida K, Tenchini F, Uchida M, Uehara S, Uglov T, Unno Y, Uno S, Urquijo P, Ushiroda Y, Van Tonder R, Varner G, Varvell KE, Vinokurova A, Vorobyev V, Waheed E, Wang CH, Wang E, Wang M-Z, Wang P, Watanabe M, Watanuki S, Wehle S, Wiechczynski J, Won E, Xu X, Yabsley BD, Yan W, Yang SB, Ye H, Yelton J, Yin JH, Yuan CZ, Yusa Y, Zhang ZP, Zhilich V, Zhukova V. Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays. Journal of High Energy Physics. Springer Science and Business Media LLC; 2021 Mar;2021(3).
Journal cover image

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

March 2021

Volume

2021

Issue

3

Publisher

Springer Science and Business Media LLC

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics