Skip to main content

Measurement of R(D) and R(D^{*}) with a Semileptonic Tagging Method.

Publication ,  Journal Article
Caria, G; Urquijo, P; Adachi, I; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aushev, T; Babu, V; Badhrees, I; Bahinipati, S; Bakich, AM ...
Published in: Physical review letters
April 2020

The experimental results on the ratios of branching fractions R(D)=B(B[over ¯]→Dτ^{-}ν[over ¯]_{τ})/B(B[over ¯]→Dℓ^{-}ν[over ¯]_{ℓ}) and R(D^{*})=B(B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ})/B(B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ}), where ℓ denotes an electron or a muon, show a long-standing discrepancy with the standard model predictions, and might hint at a violation of lepton flavor universality. We report a new simultaneous measurement of R(D) and R(D^{*}), based on a data sample containing 772×10^{6}  BB[over ¯] events recorded at the ϒ(4S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. In this analysis the tag-side B meson is reconstructed in a semileptonic decay mode and the signal-side τ is reconstructed in a purely leptonic decay. The measured values are R(D)=0.307±0.037±0.016 and R(D^{*})=0.283±0.018±0.014, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the standard model predictions within 0.2, 1.1, and 0.8 standard deviations for R(D), R(D^{*}), and their combination, respectively. This work constitutes the most precise measurements of R(D) and R(D^{*}) performed to date as well as the first result for R(D) based on a semileptonic tagging method.

Duke Scholars

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

April 2020

Volume

124

Issue

16

Start / End Page

161803

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Caria, G., Urquijo, P., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., … Belle Collaboration. (2020). Measurement of R(D) and R(D^{*}) with a Semileptonic Tagging Method. Physical Review Letters, 124(16), 161803. https://doi.org/10.1103/physrevlett.124.161803
Caria, G., P. Urquijo, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, et al. “Measurement of R(D) and R(D^{*}) with a Semileptonic Tagging Method.Physical Review Letters 124, no. 16 (April 2020): 161803. https://doi.org/10.1103/physrevlett.124.161803.
Caria G, Urquijo P, Adachi I, Aihara H, Al Said S, Asner DM, et al. Measurement of R(D) and R(D^{*}) with a Semileptonic Tagging Method. Physical review letters. 2020 Apr;124(16):161803.
Caria, G., et al. “Measurement of R(D) and R(D^{*}) with a Semileptonic Tagging Method.Physical Review Letters, vol. 124, no. 16, Apr. 2020, p. 161803. Epmc, doi:10.1103/physrevlett.124.161803.
Caria G, Urquijo P, Adachi I, Aihara H, Al Said S, Asner DM, Atmacan H, Aushev T, Babu V, Badhrees I, Bahinipati S, Bakich AM, Behera P, Beleño C, Bennett J, Bhuyan B, Bilka T, Biswal J, Bozek A, Bračko M, Browder TE, Campajola M, Červenkov D, Chang P, Cheaib R, Chekelian V, Chen A, Cheon BG, Chilikin K, Cho HE, Cho K, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Dash N, De Nardo G, Di Capua F, Di Carlo S, Doležal Z, Dong TV, Eidelman S, Epifanov D, Fast JE, Ferber T, Ferlewicz D, Fulsom BG, Garg R, Gaur V, Gabyshev N, Garmash A, Giri A, Goldenzweig P, Greenwald D, Grzymkowska O, Guan Y, Hartbrich O, Hayasaka K, Hayashii H, Higuchi T, Hou W-S, Hsu C-L, Iijima T, Inami K, Inguglia G, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Jacobs WW, Jeon HB, Jia S, Jin Y, Joffe D, Joo KK, Kaliyar AB, Kang KH, Karyan G, Kawasaki T, Kichimi H, Kim CH, Kim DY, Kim HJ, Kim KT, Kim SH, Kinoshita K, Kodyš P, Korpar S, Kotchetkov D, Križan P, Kroeger R, Krohn J-F, Krokovny P, Kuhr T, Kumar R, Kwon Y-J, Lange JS, Lee IS, Lee JK, Lee SC, Li LK, Li YB, Li Gioi L, Libby J, Lieret K, Liventsev D, Luo T, MacQueen C, Masuda M, Matsuda T, Matvienko D, Merola M, Metzner F, Miyabayashi K, Mohanty GB, Moon TJ, Mori T, Mussa R, Nakamura KR, Nakao M, Nath KJ, Nayak M, Nisar NK, Nishida S, Nishimura K, Ogawa K, Ono H, Onuki Y, Oskin P, Pakhlov P, Pakhlova G, Pal B, Pang T, Park H, Park S-H, Patra S, Paul S, Pedlar TK, Pestotnik R, Piilonen LE, Popov V, Prencipe E, Prim MT, Rabusov A, Resmi PK, Ritter M, Rozanska M, Russo G, Sahoo D, Sakai Y, Sandilya S, Santelj L, Sanuki T, Savinov V, Schneider O, Schnell G, Schueler J, Schwanda C, Schwartz AJ, Seino Y, Senyo K, Sevior ME, Shebalin V, Shiu J-G, Shwartz B, Simon F, Sokolov A, Solovieva E, Starič M, Stottler ZS, Sumiyoshi T, Sutcliffe W, Takizawa M, Tamponi U, Tanida K, Tenchini F, Trabelsi K, Uchida M, Uglov T, Uno S, Usov Y, Vahsen SE, Van Tonder R, Varner G, Varvell KE, Vossen A, Waheed E, Wang B, Wang CH, Wang M-Z, Wang P, Wang XL, Watanuki S, Wiechczynski J, Won E, Yamamoto H, Yang SB, Ye H, Yin JH, Yuan CZ, Zhang ZP, Zhilich V, Zhukova V, Zhulanov V, Belle Collaboration. Measurement of R(D) and R(D^{*}) with a Semileptonic Tagging Method. Physical review letters. 2020 Apr;124(16):161803.

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

April 2020

Volume

124

Issue

16

Start / End Page

161803

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences