Journal Article

Determination of heavy quark non-perturbative parametersfrom spectral moments in semileptonic B decays

Kluit, P, Borisov, G, Santo, CE, Pape, L, Montenegro, J, Kernel, G, Parodi, F, Savoy-Navarro, A, Bracko, M, Tonazzo, A, De Min, A, Nikolenko, M, Vrba, V, Moraes, D, Rehn, J, Szumlak, T, Becks, KH, Yushchenko, O, Van Dam, P, Moch, M, Passon, O, Grzelak, K, Tzamarias, S, Camporesi, T, Paganoni, M, Ellert, M, Apel, WD, Kucharczyk, M, Pimenta, M, Bluj, M, Uvarov, V, Kersevan, P, Alemany-Fernandez, R, Fuster, J, Vilanova, D, Grosdidier, G, Haag, C, Abdallah, J, Lemonne, J, Murray, W, Zimin, I, Segar, A, de Paula, L, Cossutti, F, Kouznetsov, O, Meroni, C, Boonekamp, M, Antilogus, P, Monge, R, Pieri, L, Read, A, Loukas, D, Smadja, G, Costa, J, Margoni, M, Ruhlmann-Kleider, V, Rivero, M, Mulders, M, Wicke, D, Contri, R, Botner, O, Holt, J, Myklebust, T, Nawrocki, K, Gavillet, P, Houlden, A, Besancon, M, Chapkin, M, Jarlskog, Göran, Barbier, R, Mariotti, C, Bouquet, B, Eigen, G, Nicolaidou, R, Abreu, P, Sopczak, A, Trochimczuk, M, Cieslik, K, Leder, G, Weiser, C, Berntzon, L, Osterberg, K, Cavallo, F, Liko, D, Myatt, G, Wahlen, H, Wickens, J, Podobnik, T, Bowcock, V, De Lotto, B, Brunet, M, Tegenfeldt, F, Hamilton, K, Tkatchev, L, Parkes, C, Silva, W, Salmi, L, Sander, C, Markou, A, Cueva

2006

Overview

Moments of the hadronic invariant mass and of the lepton energy spectra in semileptonic B decays have been determined with the data recorded by the DELPHI detector at LEP. From measurements of the inclusive b-hadron semileptonic decays, and imposing constraints from other measurements on b- and c-quark masses, the first three moments of the lepton energy distribution and of the hadronic mass distribution, have been used to determine parameters which enter into the extraction of |Vcb| from the measurement of the inclusive b-hadron semileptonic decay width. The values obtained in the kinetic scheme are:\\(\\begin{array}{*{20}l}{{m_{b} {\\left( {1\\;{\\text{GeV}}} \\right)}} \\hfill} & { = \\hfill} & {{4.591 \\pm 0.062 \\pm 0.039 \\pm 0.005\\;{\\text{GeV/c}}^{2} ,} \\hfill} \\\{{m_{c} {\\left( {1\\;{\\text{GeV}}} \\right)}} \\hfill} & { = \\hfill} & {{1.170 \\pm 0.093 \\pm 0.055 \\pm 0.005\\;{\\text{GeV/c}}^{{\\text{2}}} {\\text{,}}} \\hfill} \\\{{\\mu ^{2}_{\\pi } {\\left( {1\\;{\\text{GeV}}} \\right)}} \\hfill} & { = \\hfill} & {{0.399 \\pm 0.048 \\pm 0.034 \\pm 0.087\\;{\\text{GeV}}^{{\\text{2}}} {\\text{,}}} \\hfill} \\\{{ \\ifmmode\\expandafter\\tilde\\else\\expandafter\\~\\fi{\\rho }^{3}_{D} } \\hfill} & { = \\hfill} & {{0.053 \\pm 0.017 \\pm 0.011 \\pm 0.026\\;{\\text{GeV}}^{{\\text{3}}} ,} \\hfill} \\\\\end{array} \\)and include corrections at order 1/mb3. Using these results, and present measurements of the inclusive semileptonic decay partial width of b-hadrons at LEP, an accurate determination of |Vcb| is obtained: \\({\\left| {V_{{cb}} } \\right|} = 0.0421 \\times {\\left( {1 \\pm 0.014_{{{\\text{meas}}{\\text{.}}} \\pm 0.014_{{{\\text{fit}}} \\pm 0.015_{{{\\text{th}}{\\text{.}}} } \\right)}\\)

• Publisher: Springer Nature B.V
• Subject: Arrays / Decay / Energy distribution / Energy spectra / Fysik / Hadrons / Leptons / Mass distribution / Natural Sciences / Naturvetenskap / Physical Sciences / Quarks / Subatomic Physics / Subatomär fysik