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B, D and K decays.

Buchalla, G. and Komatsubara, T.K. and Muheim, F. and Silvestrini, L. and Artuso, M. and Asner, D.M. and Ball, P. and Baracchini, E. and Bell, G. and Beneke, M. and Berryhill, J. and Bevan, A. and Bigi, I.I. and Blanke, M. and Bobeth, Ch. and Bona, M. and Borzumati, F. and Browder, T. and Buanes, T. and Buchmüller, O. and Buras, A.J. and Burdin, S. and Cassel, D.G. and Cavanaugh, R. and Ciuchini, M. and Colangelo, P. and Crosetti, G. and Dedes, A. and De Fazio, F. and Descotes-Genon, S. and Dickens, J. and Doležal, Z. and Dürr, S. and Egede, U. and Eggel, C. and Eigen, G. and Fajfer, S. and Feldmann, Th. and Ferrandes,, R. and Gambino, P. and Gershon, T. and Gibson, V. and Giorgi, M. and Gligorov, V.V. and Golob, B. and Golutvin, A. and Grossman,, Y. and Guadagnoli, D. and Haisch, U. and Hazumi, M. and Heinemeyer, S. and Hiller, G. and Hitlin, D. and Huber, T. and Hurth, T. and Iijima, T. and Ishikawa, A. and Isidori, G. and Jäger, S. and Khodjamirian, A. and Koppenburg, P. and Lagouri, T. and Langenegger, U. and Lazzeroni, C. and Lenz, A. and Lubicz, V. and Lucha, W. and Mahlke, H. and Melikhov, D. and Mescia, F. and Misiak, M. and Nakao, M. and Napolitano, J. and Nikitin, N. and Nierste, U. and Oide, K. and Okada, Y. and Paradisi, P. and Parodi, F. and Patel, M. and Petrov, A.A. and Pham, T.N. and Pierini, M. and Playfer, S. and Polesello, G. and Policicchio, A. and Poschenrieder,, A. and Raimondi, P. and Recksiegel, S. and Řezníček, P. and Robert, A. and Rosner, J.L. and Ruggiero, G. and Sarti, A. and Schneider, O. and Schwab, F. and Simula, S. and Sivoklokov, S. and Slavich, P. and Smith, C. and Smizanska, M. and Soni, A. and Speer, T. and Spradlin, P. and Spranger, M. and Starodumov, A. and Stech, B. and Stocchi, A. and Stone, S. and Tarantino, C. and Teubert, F. and T’Jampens, S. and Toms, K. and Trabelsi, K. and Trine, S. and Uhlig, S. and Vagnoni, V. and van Hunen, J.J. and Weiglein, G. and Weiler, A. and Wilkinson, G. and Xie, Y. and Yamauchi, M. and Zhu, G. and Zupan, J. and Zwicky, R. (2008) 'B, D and K decays.', European physical journal C., 57 (1-2). pp. 309-492.


The present report documents the results of Working Group 2: B, D and K decays, of the workshop on Flavor in the Era of the LHC, held at CERN from November 2005 through March 2007. With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC. The aim of Working Group 2 was twofold: on the one hand, to provide a coherent up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-p T and flavor data. This report is organized as follows: in Sect. 1, we give an overview of NP models, focusing on a few examples that have been discussed in some detail during the workshop, with a short description of the available computational tools for flavor observables in NP models. Section 2 contains a concise discussion of the main theoretical problem in flavor physics: the evaluation of the relevant hadronic matrix elements for weak decays. Section 3 contains a detailed discussion of NP effects in a set of flavor observables that we identified as “benchmark channels” for NP searches. The experimental prospects for flavor physics at future facilities are discussed in Sect. 4. Finally, Sect. 5 contains some assessments on the work done at the workshop and the prospects for future developments.

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