DD 0 Kpipipi A first look Arjun Trivedi
- Slides: 6
D*->D 0 ->Kpipipi • A first look Arjun Trivedi B-physics hadronic decays subgroup meeting 05/21/10 Arjun Trivedi 1
Used V 0 Vertex. Fitter to reconstruct D 0 -> Kπππ where the D 0 comes from D* • Data Runs [Min. Bias Stream]: [152166, 152214, 152345, 152409, 152441, 152508, 152777, 152844, 152845, 152878, 153565, 155073, 155112, 155116, 155160, 155228, 155569, 155634, 155669] ~2. 6 Mevts using L 1_MBTS_1 Trigger Selection • MC Dataset : mc 09_7 Te. V. 105001. pythia_minbias. merge. AOD. e 517_s 787_s 767_r 1250_r 12 60 20 Mevts Results are only qualitative in this presentation & just to show that a signal in the K 3 pi has been observed: B-physics hadronic decays Arjun Trivedi The MC results are presented with an overcounting bug in code subgroup meeting 05/21/10 2
Track Selections Cuts: Pt of (K, pi, pi) > 0. 5 Ge. V Pt of (pis) > 0. 2 Ge. V Eta(K, pi, pis) > 2. 5 Pixel Hits (K, pi, pi_s) > 1 SCT Hits (K, pi, pi_s) > 4 d 0(pis) < 0. 5 Z 0 *sin(Theta) (pis) < 1. 5 Vertexing Cuts for reconstructed D 0: Chi 2 < 12 Lxy > 0 D 0 Impact parameter cuts: d 0 < 0. 2 Z 0 *sin(Theta) (pis) < 0. 5 D* cuts: Pt(D*) > 8 Ge. V; eta(D*) < 1. 5 pt(D*)/Et_miss > 0. 2
Delta. M (Data/MC) D 0 Mass cut: (1. 83, 1. 90) DA TA M C B-physics hadronic decays subgroup meeting 05/21/10 Arjun Trivedi 4
Delta. M Cut: (0. 144, 0. 147) Refitted & Combinatoric D 0 Mass (Data/MC) DA TA M C B-physics hadronic decays subgroup meeting 05/21/10 Arjun Trivedi 5
B-physics hadronic decays subgroup meeting 05/21/10 Arjun Trivedi 6
