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Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast})$ with a semileptonic tagging method

Publication ,  Journal Article
Collaboration, TB; Abdesselam, A; Adachi, I; Adamczyk, K; Aihara, H; Said, SA; Arinstein, K; Arita, Y; Asner, DM; Aso, T; Atmacan, H; Ayad, R ...
April 18, 2019

We report a measurement of the ratios of branching fractions $\mathcal{R}(D) = {\cal B}(\bar{B} \to D \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B} \to D \ell^- \bar{\nu}_{\ell})$ and $\mathcal{R}(D^{\ast}) = {\cal B}(\bar{B} \to D^* \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B} \to D^* \ell^- \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or a muon. The results are based on a data sample containing $772\times10^6$ $B\bar{B}$ events recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider. The analysis utilizes a method where 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 $\mathcal{R}(D)= 0.307 \pm 0.037 \pm 0.016$ and $\mathcal{R}(D^{\ast})= 0.283 \pm 0.018 \pm 0.014$, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the Standard Model predictions within $0.2$ and $1.1$ standard deviations, respectively, while their combination agrees with the Standard Model predictions within $1.2$ standard deviations.

Duke Scholars

Publication Date

April 18, 2019
 

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Collaboration, T. B., Abdesselam, A., Adachi, I., Adamczyk, K., Aihara, H., Said, S. A., … Zwahlen, N. (2019). Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast})$ with a semileptonic tagging method.
Collaboration, The Belle, A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, S Al Said, K. Arinstein, et al. “Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast})$ with a semileptonic tagging method,” April 18, 2019.
Collaboration TB, Abdesselam A, Adachi I, Adamczyk K, Aihara H, Said SA, et al. Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast})$ with a semileptonic tagging method. 2019 Apr 18;
Collaboration TB, Abdesselam A, Adachi I, Adamczyk K, Aihara H, Said SA, Arinstein K, Arita Y, Asner DM, Aso T, Atmacan H, Aulchenko V, Aushev T, Ayad R, Aziz T, Babu V, Badhrees I, Bahinipati S, Bakich AM, Bala A, Ban Y, Bansal V, Barberio E, Barrett M, Bartel W, Bay A, Behera P, Belhorn M, Belous K, Berger M, Bernlochner FU, Besson D, Bhardwaj V, Bhuyan B, Biswal J, Bloomfield T, Blyth S, Bobrov A, Bondar A, Bonvicini G, Bookwalter C, Boulahouache C, Bozek A, Bračko M, Braun N, Breibeck F, Brodzicka J, Browder TE, Caria G, Červenkov D, Chang M-C, Chang P, Chao Y, Chekelian V, Chen A, Chen K-F, Chen P, Cheon BG, Chilikin K, Chistov R, Cho K, Chobanova V, Choi S-K, Choi Y, Cinabro D, Crnkovic J, Cunliffe S, Dalseno J, Danilov M, Dash N, Carlo SD, Dingfelder J, Doležal Z, Dossett D, Drásal Z, Drutskoy A, Dubey S, Dutta D, Dutta K, Eidelman S, Epifanov D, Falke S, Farhat H, Fast JE, Feindt M, Ferber T, Frey A, Frost O, Fulsom BG, Gaur V, Gabyshev N, Ganguly S, Garmash A, Gelb M, Gemmler J, Getzkow D, Gillard R, Giordano F, Glattauer R, Goh YM, Goldenzweig P, Golob B, Greenwald D, Perdekamp MG, Grygier J, Grzymkowska O, Guan Y, Guido E, Guo H, Haba J, Hamer P, Han YL, Hara K, Hara T, Hasegawa Y, Hasenbusch J, Hayasaka K, Hayashii H, He XH, Heck M, Hedges MT, Heffernan D, Heider M, Heller A, Higuchi T, Himori S, Hirose S, Horiguchi T, Hoshi Y, Hoshina K, Hou W-S, Hsiung YB, Hsu C-L, Huschle M, Hyun HJ, Igarashi Y, Iijima T, Imamura M, Inami K, Inguglia G, Ishikawa A, Itagaki K, Itoh R, Iwabuchi M, Iwasaki M, Iwasaki Y, Iwata S, Jacobs WW, Jaegle I, Jeon HB, Jia S, Jin Y, Joffe D, Jones M, Joo KK, Julius T, Kahn J, Kakuno H, Kaliyar AB, Kang JH, Kang KH, Kapusta P, Karyan G, Kataoka SU, Kato E, Kato Y, Katrenko P, Kawai H, Kawasaki T, Keck T, Kichimi H, Kiesling C, Kim BH, Kim DY, Kim HJ, Kim H-J, Kim JB, Kim JH, Kim KT, Kim MJ, Kim SH, Kim SK, Kim YJ, Kinoshita K, Kleinwort C, Klucar J, Ko BR, Kobayashi N, Koblitz S, Kodyš P, Koga Y, Korpar S, Kotchetkov D, Kouzes RT, Križan P, Krokovny P, Kronenbitter B, Kuhr T, Kulasiri R, Kumar R, Kumita T, Kurihara E, Kuroki Y, Kuzmin A, Kvasnička P, Kwon Y-J, Lai Y-T, Lange JS, Lee DH, Lee IS, Lee S-H, Leitgab M, Leitner R, Levit D, Lewis P, Li CH, Li H, Li J, Li L, Li X, Li Y, Gioi LL, Libby J, Limosani A, Liu C, Liu Y, Liu ZQ, Liventsev D, Loos A, Louvot R, Lubej M, Lukin P, Luo T, MacNaughton J, Masuda M, Matsuda T, Matvienko D, Matyja A, Metzner F, McOnie S, Mikami Y, Miyabayashi K, Miyachi Y, Miyake H, Miyata H, Miyazaki Y, Mizuk R, Mohanty GB, Mohanty S, Mohapatra D, Moll A, Moon HK, Mori T, Morii T, Moser H-G, Mrvar M, Müller T, Muramatsu N, Mussa R, Nagamine T, Nagasaka Y, Nakahama Y, Nakamura I, Nakamura KR, Nakano E, Nakano H, Nakano T, Nakao M, Nakayama H, Nakazawa H, Nanut T, Nath KJ, Natkaniec Z, Nayak M, Nedelkovska E, Negishi K, Neichi K, Ng C, Niebuhr C, Niiyama M, Nisar NK, Nishida S, Nishimura K, Nitoh O, Nozaki T, Ogawa A, Ogawa S, Ohshima T, Okuno S, Olsen SL, Ono H, Ono Y, Onuki Y, Ostrowicz W, Oswald C, Ozaki H, Pakhlov P, Pakhlova G, Pal B, Palka H, Panzenböck E, Park C-S, Park CW, Park H, Park KS, Paul S, Peak LS, Pedlar TK, Peng T, Pesántez L, Pestotnik R, Peters M, Petrič M, Piilonen LE, Poluektov A, Prasanth K, Prim M, Prothmann K, Pulvermacher C, Purohit MV, Rauch J, Reisert B, Ribežl E, Ritter M, Rorie J, Rostomyan A, Rozanska M, Rummel S, Ryu S, Sahoo H, Salehi M, Saito T, Sakai K, Sakai Y, Sandilya S, Santel D, Santelj L, Sanuki T, Sasaki J, Sasao N, Sato Y, Savinov V, Schlüter T, Schneider O, Schnell G, Schönmeier P, Schram M, Schwanda C, Schwartz AJ, Schwenker B, Seidl R, Seino Y, Semmler D, Senyo K, Seon O, Seong IS, Sevior ME, Shang L, Shapkin M, Shebalin V, Shen CP, Shibata T-A, Shibuya H, Shimizu N, Shinomiya S, Shiu J-G, Shwartz B, Sibidanov A, Simon F, Singh JB, Sinha R, Smerkol P, Sohn Y-S, Sokolov A, Soloviev Y, Solovieva E, Stanič S, Starič M, Steder M, Strube JF, Stypula J, Sugihara S, Sugiyama A, Sumihama M, Sumisawa K, Sumiyoshi T, Suzuki K, Suzuki S, Suzuki SY, Suzuki Z, Takeichi H, Takizawa M, Tamponi U, Tanaka M, Tanaka S, Tanida K, Taniguchi N, Taylor GN, Tenchini F, Teramoto Y, Tikhomirov I, Trabelsi K, Trusov V, Tsuboyama T, Uchida M, Uchida T, Uehara S, Ueno K, Uglov T, Unno Y, Uno S, Uozumi S, Urquijo P, Ushiroda Y, Usov Y, Vahsen SE, Hulse CV, Vanhoefer P, Varner G, Varvell KE, Vervink K, Vinokurova A, Vorobyev V, Vossen A, Wagner MN, Waheed E, Wang B, Wang CH, Wang J, Wang M-Z, Wang P, Wang XL, Watanabe M, Watanabe Y, Wedd R, Wehle S, White E, Widmann E, Wiechczynski J, Williams KM, Won E, Yabsley BD, Yamada S, Yamamoto H, Yamaoka J, Yamashita Y, Yamauchi M, Yashchenko S, Ye H, Yelton J, Yook Y, Yuan CZ, Yusa Y, Zhang CC, Zhang LM, Zhang ZP, Zhao L, Zhilich V, Zhukova V, Zhulanov V, Ziegler M, Zivko T, Zupanc A, Zwahlen N. Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast})$ with a semileptonic tagging method. 2019 Apr 18;

Publication Date

April 18, 2019