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Lees, J. P.; Prudent, X.; Lopez, L.; Abrams, G. S.; Brown, D. N.; Jacobsen, R. G.; Kolomensky, Yu. G.; Kukartsev, G.; Osipenkov, I. L.; Hawkes, C. M.; Soni, N.; Teodorescu, L.; Buzykaev, A. R.; Solodov, E. P.; Kirkby, D.; Stoker, D. P.; Abachi, S.; Liu, F.; Yasin, Z.; Heusch, C. A.; Wang, L.; Doll, D. A.; Soffer, A.; Schubert, K. R.; Bernard, D.; Bonneaud, G. R.; Clark, P. J.; Baldini-Ferroli, R.; Peruzzi, I. M.; Santroni, A.; Klose, V.; Onorato, G.; Dong, L.; Meyer, W. T.; Gao, Y. Y.; Denig, A. G.; Béquilleux, J.; Davier, M.; da Costa, J. Firmino; Serrano, J.; Sordini, V.; Bingham, I.; Burke, J. P.; Fry, J. R.; Touramanis, C.; George, K. A.; Flaecher, H. U.; West, T. J.; Tuggle, J. M.; Sciolla, G.; Zhao, M.; Zhao, H. W.; Nicholson, H.; Wang, W. F.; Rahimi, A. M.; Wong, Q. K.; Posocco, M.; Simonetto, F.; Voci, C.; Calderini, G.; Chauveau, J.; Prendki, J.; Biasini, M.; Neri, N.; Rizzo, G.; Smith, A. J. S.; Anulli, F.; Faccini, R.; Ferroni, F.; Morganti, S.; Piredda, G.; Schröder, H.; Olaiya, E. O.; de Monchenault, G. Hamel; Yèche, Ch; Allen, M. T.; Cenci, R.; Dunwoodie, W.; Kim, H.; Lindquist, B.; Neal, H.; O’Grady, C. P.; Ofte, I.; Perazzo, A.; Schwiening, J.; Sullivan, M. K.; Suzuki, K.; Wright, D. H.; Wulsin, H. W.; Majewski, S. A.; Petersen, B. A.; Spanier, S. M.; Schwitters, R. F.; Pelliccioni, M.; Milanes, D. A.; Kowalewski, R.; Sobie, R. J.; Latham, T. E.; Band, H. R.; Pan, Y.
Physical review. D, Particles, fields, gravitation, and cosmology, 09/2008, Letnik: 78, Številka: 5Journal Article
Using 214 fb − 1 of data recorded by the BABAR detector at the PEPII electron-positron collider, we study the decay D + s → K + K − e + ν e . Except for a small S-wave contribution, the events with K + K − masses in the range 1.01 - 1.03 GeV / c 2 correspond to ϕ mesons. For D + s → ϕ e + ν e decays, we measure the relative normalization of the Lorentz invariant form factors at q 2 = 0 , r V = V ( 0 ) / A 1 ( 0 ) = 1.849 ± 0.060 ± 0.095 , r 2 = A 2 ( 0 ) / A 1 ( 0 ) = 0.763 ± 0.071 ± 0.065 and the pole mass of the axial-vector form factors m A = ( 2.28 + 0.23 − 0.18 ± 0.18 ) GeV / c 2 . Within the same K + K − mass range, we also measure the relative branching fraction B ( D + s → K + K − e + ν e ) / B ( D + s → K + K − π + ) = 0.558 ± 0.007 ± 0.016 , from which we obtain the total branching fraction B ( D + s → ϕ e + ν e ) = ( 2.61 ± 0.03 ± 0.08 ± 0.15 ) × 10 − 2 . By comparing this value with the predicted decay rate, we extract A 1 ( 0 ) = 0.607 ± 0.011 ± 0.019 ± 0.018 . The stated uncertainties are statistical, systematic, and from external inputs.
