Measurement of R(D) and R(D*) with a Semileptonic Tagging Method

  • Caria, G.
  • Urquijo, P.
  • Adachi, I
  • Aihara, H.
  • Al Said, S.
  • ... Cheon, B. G.
  • 외 198명
Citations

WEB OF SCIENCE

148
Citations

SCOPUS

223

초록

The experimental results on the ratios of branching fractions R(D) = B((B) over bar -> D tau(-)(nu) over bar (tau))/B((B) over bar -> Dl(-)(nu) over bar (e)) and R(D*) = B((B) over bar -> D*tau(-)(nu) over bar (tau))/B((B) over bar -> D*tau(-)(nu) over bar (e)), 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 x 10(6) B (B) over bar events recorded at the T(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 tau 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.

키워드

DECAYS
제목
Measurement of R(D) and R(D*) with a Semileptonic Tagging Method
저자
Caria, G.Urquijo, P.Adachi, IAihara, H.Al Said, S.Asner, D. M.Atmacan, H.Aushev, T.Babu, VBadhrees, IBahinipati, S.Bakich, A. M.Behera, P.Beleno, C.Bennett, J.Bhuyan, B.Bilka, T.Biswal, J.Bozek, A.Bracko, M.Browder, T. E.Campajola, M.Cervenkov, D.Chang, P.Cheaib, R.Chekelian, VChen, A.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Choi, Y.Choudhury, S.Cinabro, D.Cunliffe, S.Dash, N.De Nardo, G.Di Capua, F.Di Carlo, S.Dolezal, Z.Dong, T., VEidelman, S.Epifanov, D.Fast, J. E.Ferber, T.Ferlewicz, D.Fulsom, B. G.Garg, R.Gaur, VGabyshev, N.Garmash, A.Giri, A.Goldenzweig, P.Greenwald, D.Grzymkowska, O.Guan, Y.Hartbrich, O.Hayasaka, K.Hayashii, H.Higuchi, T.Hou, W-SHsu, C-LIijima, T.Inami, K.Inguglia, G.Ishikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Jacobs, W. W.Jeon, H. B.Jia, S.Jin, Y.Joffe, D.Joo, K. K.Kaliyar, A. B.Kang, K. H.Karyan, G.Kawasaki, T.Kichimi, H.Kim, C. H.Kim, D. Y.Kim, H. J.Kim, K. T.Kim, S. H.Kinoshita, K.Kodys, P.Korpar, S.Kotchetkov, D.Krizan, P.Kroeger, R.Krohn, J-FKrokovny, P.Kuhr, T.Kumar, R.Kwon, Y-JLange, J. S.Lee, I. S.Lee, J. K.Lee, S. C.Li, L. K.Li, Y. B.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, G. B.Moon, T. J.Mori, T.Mussa, R.Nakamura, K. R.Nakao, M.Nath, K. J.Nayak, M.Nisar, N. K.Nishida, S.Nishimura, K.Ogawa, K.Ono, H.Onuki, Y.Oskin, P.Pakhlov, P.Pakhlova, G.Pal, B.Pang, T.Park, H.Park, S-HPatra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Popov, VPrencipe, E.Prim, M. T.Rabusov, A.Resmi, P. K.Ritter, M.Rozanska, M.Russo, G.Sahoo, D.Sakai, Y.Sandilya, S.Santelj, L.Sanuki, T.Savinov, VSchneider, O.Schnell, G.Schueler, J.Schwanda, C.Schwartz, A. J.Seino, Y.Senyo, K.Sevior, M. E.Shebalin, VShiu, J-GShwartz, B.Simon, F.Sokolov, A.Solovieva, E.Staric, M.Stottler, Z. S.Sumiyoshi, T.Sutcliffe, W.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Trabelsi, K.Uchida, M.Uglov, T.Uno, S.Usov, Y.Vahsen, S. E.Van Tonder, R.Varner, G.Varvell, K. E.Vossen, A.Waheed, E.Wang, B.Wang, C. H.Wang, M-ZWang, P.Wang, X. L.Watanuki, S.Wiechczynski, J.Won, E.Yamamoto, H.Yang, S. B.Ye, H.Yin, J. H.Yuan, C. Z.Zhang, Z. P.Zhilich, VZhukova, VZhulanov, V
DOI
10.1103/PhysRevLett.124.161803
발행일
2020-04
유형
Article
저널명
Physical Review Letters
124
16
페이지
1 ~ 8

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