Model-independent extraction of form factors and |Vcb| in Bbar --> D ell- nubar_ell with hadronic tagging at BABAR
Articolo
Data di Pubblicazione:
2024
Abstract:
Using the entire BABAR Upsilon(4S) dataset, the first two-dimensional unbinned angular analysis of the semileptonic decay Bbar --> D ell- nubar_ell is performed, employing hadronic reconstruction of the tag-side B meson from Upsilon(4S) \to B Bbar. Here, ell denotes the light charged leptons e and mu. A novel data-driven signal-background separation procedure with minimal dependence on simulation is developed. This procedure preserves all
multidimensional correlations present in the data. The expected sin^2 theta_ell dependence of the differential decay rate in the Standard Model is demonstrated, where theta_ell is the lepton helicity angle. Including input from the latest lattice QCD calculations and previously available experimental data, the underlying form factors are extracted using both model-independent (BGL) and dependent (CLN) methods. Comparisons with lattice calculations show flavor SU(3) symmetry to be a good approximation in the B(s) --> D(s) sector. Using the BGL results, the CKM matrix element |Vcb| = (41.09 +- 1.16) x 10^-3 and the Standard Model prediction of the lepton-flavor universality violation variable R(D) = 0.300 +- 0.004, are extracted. The value of |Vcb| from Bbar --> D ell- nubar_ell tends to be higher than that extracted using Bbar --> D* ell- nubar_ell. The Standard Model R(D) calculation is at a 1.97sigma tension with the latest HFLAV experimental average.
Tipologia CRIS:
14.a.1 Articolo su rivista
Keywords:
Lepton; Hadron; Physics
Elenco autori:
Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Brown, D. N.; Kolomensky, Yu. G.; Fritsch, M.; Koch, H.; Cheaib, R.; Hearty, C.; Mattison, T. S.; Mckenna, J. A.; So, R. Y.; Blinov, V. E.; Buzykaev, A. R.; Druzhinin, V. P.; Kozyrev, E. A.; Kravchenko, E. A.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Lankford, A. J.; Dey, B.; Gary, J. W.; Long, O.; Eisner, A. M.; Lockman, W. S.; Panduro Vazquez, W.; Chao, D. S.; Cheng, C. H.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Li, Y.; Lin, D. X.; Middleton, S.; Miyashita, T. S.; Ongmongkolkul, P.; Oyang, J.; Porter, F. C.; Röhrken, M.; Meadows, B. T.; Sokoloff, M. D.; Smith, J. G.; Wagner, S. R.; Bernard, D.; Verderi, M.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Santoro, V.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Martellotti, S.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rotondo, M.; Zallo, A.; Passaggio, S.; Patrignani, C.; Shuve, B. J.; Lacker, H. M.; Bhuyan, B.; Mallik, U.; Chen, C.; Cochran, J.; Prell, S.; Gritsan, A. V.; Arnaud, N.; Davier, M.; Le Diberder, F.; Lutz, A. M.; Wormser, G.; Lange, D. J.; Wright, D. M.; Coleman, J. P.; Hutchcroft, D. E.; Payne, D. J.; Touramanis, C.; Bevan, A. J.; Di Lodovico, F.; Cowan, G.; Banerjee, Sw.; Brown, D. N.; Davis, C. L.; Denig, A. G.; Gradl, W.; Griessinger, K.; Hafner, A.; Schubert, K. R.; Barlow, R. J.; Lafferty, G. D.; Cenci, R.; Jawahery, A.; Roberts, D. A.; Cowan, R.; Robertson, S. H.; Seddon, R. M.; Neri, N.; Palombo, F.; Cremaldi, L.; Godang, R.; Summers, D. J.; De Nardo, G.; Sciacca, C.; Jessop, C. P.; Losecco, J. M.; Honscheid, K.; Gaz, A.; Margoni, M.; Simi, G.; Simonetto, F.; Stroili, R.; Akar, S.; Ben-Haim, E.; Bomben, M.; Bonneaud, G. R.; Calderini, G.; Chauveau, J.; Marchiori, G.; Ocariz, J.; Biasini, M.; Manoni, E.; Rossi, A.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Chrzaszcz, M.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Rama, M.; Rizzo, G.; Walsh, J. J.; Zani, L.; Smith, A. J. S.; Anulli, F.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Pilloni, A.; Bünger, C.; Dittrich, S.; Grünberg, O.; Leddig, T.; Voß, C.; Waldi, R.; Adye, T.; Wilson, F. F.; Emery, S.; Vasseur, G.; Aston, D.; Cartaro, C.; Convery, M. R.; Dunwoodie, W.; Ebert, M.; Field, R. C.; Fulsom, B. G.; Graham, M. T.; Hast, C.; Kim, P.; Luitz, S.; Macfarlane, D. B.; Muller, D. R.; Neal, H.; Ratcliff, B. N.; Roodman, A.; Sullivan, M. K.; Va'Vra, J.; Wisniewski, W. J.; Purohit, M. V.; Wilson, J. R.; Sekula, S. J.; Ahmed, H.; Tasneem, N.; Bellis, M.; Burchat, P. R.; Puccio, E. M. T.; Ernst, J. A.; Gorodeisky, R.; Guttman, N.; Peimer, D. R.; Soffer, A.; Spanier, S. M.; Ritchie, J. L.; Izen, J. M.; Lou, X. C.; Bianchi, F.; De Mori, F.; Filippi, A.; Lanceri, L.; Vitale, L.; Martinez-Vidal, F.; Oyanguren, A.; Albert, J.; Beaulieu, A.; Bernlochner, F. U.; King, G. J.; Kowalewski, R.; Lueck, T.; Miller, C.; Nugent, I. M.; Roney, J. M.; Sobie, R. J.; Gershon, T. J.; Harrison, P. F.; Latham, T. E.; Wu, S. L.
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