Details

Autor(en) / Beteiligte

• Urquijo, P
• Adachi, I
• Al Said, S
• Asner, D M
• Atmacan, H
• Aushev, T
• Bahinipati, S
• Bakich, A M
• Beleño, C
• Bhuyan, B
• Bilka, T
• Biswal, J
• Bozek, A
• Browder, T E
• Červenkov, D
• Cheaib, R
• Chekelian, V
• Chen, A
• Cheon, B G
• Cho, H E
• Cho, K
• Cinabro, D
• Cunliffe, S
• Dash, N
• De Nardo, G
• Di Capua, F
• Di Carlo, S
• Dong, T V
• Eidelman, S
• Fulsom, B G
• Garg, R
• Gaur, V
• Gabyshev, N
• Garmash, A
• Goldenzweig, P
• Greenwald, D
• Grzymkowska, O
• Guan, Y
• Hayasaka, K
• Hayashii, H
• Hsu, C-L
• Inami, K
• Ishikawa, A
• Itoh, R
• Iwasaki, M
• Jeon, H B
• Kaliyar, A B
• Kang, K H
• Kichimi, H
• Kim, K T
• Kodyš, P
• Korpar, S
• Kroeger, R
• Krohn, J-F
• Kumar, R
• Li Gioi, L
• Lieret, K
• MacQueen, C
• Mori, T
• Nakao, M
• Nayak, M
• Nisar, N K
• Nishimura, K
• Ono, H
• Pakhlov, P
• Pal, B
• Pang, T
• Park, H
• Patra, S
• Paul, S
• Pestotnik, R
• Prim, M T
• Resmi, P K
• Sakai, Y
• Sandilya, S
• Savinov, V
• Schnell, G
• Schwanda, C
• Schwartz, A J
• Seino, Y
• Starič, M
• Sumiyoshi, T
• Sutcliffe, W
• Tamponi, U
• Trabelsi, K
• Uglov, T
• Uno, S
• Usov, Y
• Van Tonder, R
• Varner, G
• Varvell, K E
• Vossen, A
• Wang, P
• Wang, X L
• Won, E
• Yamamoto, H
• Ye, H
• Zhang, Z P
• Zhilich, V
• Zhukova, V

Titel

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

Ist Teil von

• Physical review letters, 2020-04, Vol.124 (16), p.161803-161803, Article 161803

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2020

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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.