학술논문
Analysis of the D+→K-π+e +νe decay channel
Document Type
article
Author
Del Amo Sanchez, P; Lees, JP; Poireau, V; Prencipe, E; Tisserand, V; Garra Tico, J; Grauges, E; Martinelli, M; Milanes, DA; Palano, A; Pappagallo, M; Eigen, G; Stugu, B; Sun, L; Brown, DN; Kerth, LT; Kolomensky, YG; Lynch, G; Osipenkov, IL; Koch, H; Schroeder, T; Asgeirsson, DJ; Hearty, C; Mattison, TS; McKenna, JA; Khan, A; Randle-Conde, A; Blinov, VE; Buzykaev, AR; Druzhinin, VP; Golubev, VB; Kravchenko, EA; Onuchin, AP; Serednyakov, SI; Skovpen, YI; Solodov, EP; Todyshev, KY; Yushkov, AN; Bondioli, M; Curry, S; Kirkby, D; Lankford, AJ; Mandelkern, M; Martin, EC; Stoker, DP; Atmacan, H; Gary, JW; Liu, F; Long, O; Vitug, GM; Campagnari, C; Hong, TM; Kovalskyi, D; Richman, JD; West, C; Eisner, AM; Heusch, CA; Kroseberg, J; Lockman, WS; Martinez, AJ; Schalk, T; Schumm, BA; Seiden, A; Winstrom, LO; Cheng, CH; Doll, DA; Echenard, B; Hitlin, DG; Ongmongkolkul, P; Porter, FC; Rakitin, AY; Andreassen, R; Dubrovin, MS; Mancinelli, G; Meadows, BT; Sokoloff, MD; Bloom, PC; Ford, WT; Gaz, A; Nagel, M; Nauenberg, U; Smith, JG; Wagner, SR; Ayad, R; Toki, WH; Jasper, H; Karbach, TM; Petzold, A; Spaan, B; Kobel, MJ; Schubert, KR; Schwierz, R; Bernard, D; Verderi, M; Clark, PJ; Playfer, S; Watson, JE; Andreotti, M; Bettoni, D; Bozzi, C
Source
Physical Review D - Particles, Fields, Gravitation and Cosmology. 83(7)
Subject
Language
Abstract
Using 347.5fb-1 of data recorded by the BABAR detector at the PEP-II electron-positron collider, 244×103 signal events for the D +→K-π+e+νe decay channel are analyzed. This decay mode is dominated by the K̄(892)0 contribution. We determine the K̄*(892)0 parameters: mK(892)0=(895.4±0.2±0.2)MeV/c2, ΓK *(892)00=(46.5±0.3±0.2)MeV/c2, and the Blatt-Weisskopf parameter rBW=2.1±0.5±0.5(GeV/c) -1, where the first uncertainty comes from statistics and the second from systematic uncertainties. We also measure the parameters defining the corresponding hadronic form factors at q2=0 (rV=V(0)A 1(0)=1.463±0.017±0.031, r2=A 2(0)A1(0)=0.801±0.020±0.020) and the value of the axial-vector pole mass parametrizing the q2 variation of A1 and A2: mA=(2.63±0.10±0.13)GeV/c2. The S-wave fraction is equal to (5.79±0.16±0.15)%. Other signal components correspond to fractions below 1%. Using the D+→K -π+π+ channel as a normalization, we measure the D+ semileptonic branching fraction: B(D +→K-π+e+νe)= (4.00±0.03±0.04±0.09)×10-2, where the third uncertainty comes from external inputs. We then obtain the value of the hadronic form factor A1 at q2=0: A1(0)=0.6200±0. 0056±0.0065±0.0071. Fixing the P-wave parameters, we measure the phase of the S wave for several values of the Kπ mass. These results confirm those obtained with Kπ production at small momentum transfer in fixed target experiments. © 2011 American Physical Society.