Evidence of the Purely Leptonic Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>τ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msub><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>τ</mml:mi></mml:msub></mml:math>

Ikado, K.; Abe, Kazuo; Adachi, I.; Aihara, H.; Akai, K.; Akemoto, M.; Anipko, D.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Aziz, T.; Bakich, A. M.; Balagura, V.; Barbero, M.; Bay, A.; Bedny, I.; Belous, K.; Bitenc, U.; Bizjak, I.; Bondar, A.; Bożek, A.; Bračko, M.; Browder, T. E.; Chang, P.; Chen, A.; Chen, W. T.; Choi, Y.; Cole, S.; Dalseno, J.; Danilov, M.; Dash, M.; Eidelman, S.; Epifanov, D.; Flanagan, J.; Fratina, S.; Furukawa, K.; Gabyshev, N.; Gershon, T.; Go, A.; Gokhroo, G.; Golob, B.; Gorišek, A.; Ha, H.; Haba, J.; Hara, K.; Hara, T.; Hastings, N. C.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Hinz, L.; Hokuue, T.; Hoshi, Y.; Hou, S.; Hou, W.-S.; Iida, N.; Iijima, T.; Imoto, A.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kamitani, T.; Kang, J. H.; Kataoka, S. U.; Katayama, N.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kikutani, E.; Kim, H. J.; Kim, H. O.; Kinoshita, K.; Koiso, H.; Korpar, S.; Križan, P.; Krokovny, P.; Kulasiri, R.; Kumar, R.; Kuo, C. C.; Kuzmin, A.; Kwon, Y. J.; Lange, J. S.; Leder, G.; Lee, J.; Lesiak, T.; Limosani, A.; Lin, S. W.; Liventsev, D.; Marlow, D.; Matsumoto, T.; Matyja, A.; McOnie, S.; Michizono, Shinichiro; Mimashi, T.; Mitaroff, W.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Nagamine, T.; Nakamura, I.; Nakamura, T.; Nakano, E.; Nakao, M.; Nishida, S.; Nitoh, O.; Noguchi, S.; Nozaki, T.; Ogawa, S.; Ogawa, Yoshinori; Ohmi, K.; Ohshima, T.; Ohuchi, N.; Oide, K.; Okabe, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Ostrowicz, W.; Ozaki, H.; Pakhlov, P.; Park, C. W.; Park, H.; Pestotnik, R.; Piilonen, L. E.; Poluektov, A.; Różańska, M.; Sakai, Y.; Schietinger, T.; Schneider, O.; Schwanda, C.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shibuya, H.; Shidara, T.; Shwartz, B.; Sidorov, V.; Sokolov, A.; Somov, A.; Stanič, S.; Starič, M.; Stoeck, H.; Sumisawa, K.; Sumiyoshi, T.; Suzuki, S.; Tajima, O.; Takasaki, F.; Tamai, K.; Tamura, N.; Tanaka, M.; Tawada, M.; Taylor, G. N.; Teramoto, Y.; Tian, X. C.; Trabelsi, K.; Tsuboyama, T.; Tsukamoto, T.; Uehara, S.; Uglov, T.; Ueno, K.; Unno, Y.; Uno, S.; Usov, Y.; Varner, G.; Villa, S.; Wang, C. C.; Wang, C. H.; Watanabe, Y.; Won, E.; Yabsley, B.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Yoshida, Masato; Yusa, Y.; Zhang, L. M.; Zhang, Z. P.; Zhilich, V.; Zürcher, D.

doi:10.1103/physrevlett.97.251802

Cited by 201 publications

(88 citation statements)

References 11 publications

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“…We now look at the tree-level decay B + → τ + ν, which was the subject of great interest in the previous dacade as the data from BaBar [176] and Belle [177] implied a world average in the ballpark of B(B + → τ + ν τ ) exp = (1.73 ± 0.35) × 10 −4 , roughly by a factor of 2 higher than the SM value. Meanwhile, the situation changed considerably due to 2012 data from Belle [178] so that the present world average that combines BaBar and Belle data reads [112] …”

Section: Preliminariesmentioning

confidence: 99%

Towards the identification of new physics through quark flavour violating processes

2014

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We outline a systematic strategy which should help in this decade to identify New Physics (NP) beyond the Standard Model (SM) by means of quark flavour violating processes and thereby to extend the picture of short distance physics down to the scales as short as 10 −20 m and even shorter distance scales corresponding to energies of 100 TeV. Rather than using all possible flavour violating observables that will be measured in the coming years at the LHC, SuperKEKB and in Kaon physics dedicated experiments at CERN, J-PARC and Fermilab, we concentrate on those observables that are theoretically clean and very sensitive to NP. Assuming that the data on the selected observables by us will be very precise, we stress the importance of correlations between these observables as well as of future precise calculations of non-perturbative parameters by means of lattice QCD simulations with dynamical fermions. Our strategy consists of twelve steps which we will discuss in detail illustrating possible outcomes with the help of the SM, models with constrained Minimal Flavour Violation (CMFV), MFV at large and models with tree-level FCNCs mediated by neutral gauge bosons and scalars. We also briefly summarize the status of a number of concrete models. We propose DNA-charts that exhibit correlations between flavour observables in different NP scenarios. The models with new left-handed and/or right-handed currents and non-MFV interactions can be distinguished transparently in this manner. We emphasize the important role of the stringent CMFV relations between various observables as standard candles of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario. The success of this program will be very much facilitated through direct signals of NP at the LHC even if LHC will not be able to probe the physics at scales shorter than 4×10 −20 m. We also emphasize the importance of lepton flavour violation, electric dipole moments and (g − 2) e,µ in these studies.

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Section: Preliminariesmentioning

confidence: 99%

Towards the identification of new physics through quark flavour violating processes

2014

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“…There are four independent measurements of B u → τ ν [10][11][12][13][14] and the current world average is [68]:…”

Section: The Decay B U → τ νmentioning

confidence: 99%

“…The two measurements by BABAR [13,14] have used a large amount (∼ 70%) of the available data taken at Υ(4S). The two measurements by BELLE [10][11][12] are with 414 fb −1 and 605 fb −1 , and so these could be significantly updated with the total integrated luminosity of 1000 fb −1 . A high-luminosity B factory with around 50 ab −1 could measure B u → τ ν to a precision of around 6% (e.g.…”

Section: The Decay B U → τ νmentioning

confidence: 99%

“…The unprecedented data samples provided by the B factories have enabled the first JHEP10(2010)038 measurements of B u → τ ν [10][11][12][13][14] despite its relatively small BR and challenging signature. The current world average of BR(B u → τ ν) has an error of 20%, although proposed highluminosity flavour factories could reach a precision of 5% [15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Measuring V ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons

Akeroyd

Mahmoudi

2010

J. High Energ. Phys.

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The experimental prospects for precise measurements of the leptonic decays B u → τ ν/µν, B s → µ + µ − , D → µν and D s → µν/τ ν are very promising. Double ratios involving four of these decays can be defined in which the dependence on the values of the decay constants is essentially eliminated, thus enabling complementary measurements of the CKM matrix element V ub with a small theoretical error. We quantify the experimental error in a possible future measurement of |V ub | using this approach, and show that it is competitive with the anticipated precision from the conventional approaches. Moreover, it is shown that such double ratios can be more effective than the individual leptonic decays as a probe of the parameter space of supersymmetric models. We emphasize that the double ratios have the advantage of using |V ub | as an input parameter (for which there is experimental information), while the individual decays have an uncertainty from the decay constants (e.g. f Bs ), and hence a reliance on theoretical techniques such as lattice QCD.

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“…The Belle [24] and BaBar [25] collaboration have measured the branching ratio B(B → τ ν) to be: In the SM the flavor changing neutral current (FCNC) process in b decays, b → sγ, can be described with a penguin diagram, in which a virtual W is exchanged in a loop with an up-type quark in conjunction with the emission of a photon, as shown in Fig. 2 However, this limit is highly dependent on various SUSY parameters and corrections [28].…”

Section: Indirect Limitsmentioning

confidence: 99%

Search for charged Higgs bosons in decays of top quarks in proton - antiproton collisions at √s = 1.96 TeV

2009

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Evidence of the Purely Leptonic DecayB−→τ−ν¯τ

Cited by 201 publications

References 11 publications

Towards the identification of new physics through quark flavour violating processes

Towards the identification of new physics through quark flavour violating processes

Measuring V ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons

Search for charged Higgs bosons in decays of top quarks in proton - antiproton collisions at √s = 1.96 TeV

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