Study of excited states \'C\' \' *C\' by hadronic production.

Author(s)

Monique Kamla Moura Srivastava

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
• Defense date: 2000-12-19

Examining board members

Carlos Ourivio Escobar; Roberto José Maria Covolan; Renata Zukanovich Funchal; Miriam Gandelman; Rogério Rosenfeld

• Advisor: Carlos Ourivio Escobar

Abstract

The experiment E781/SELEX collected a total of 1 billion charm trígger events ou tape using a 600 GeV/c -/ and a 500 GeV/c proton secondary beams, both from the 800 GeV/c proton beam delivered by the Fermilab Tevatron, Those beams reached the copper and carbon targets. The main goal was to study charm hadron production and decays. This work is dedicated to study the c++/0(2455) c++/- e c (++/0)*(2520) c++/- states from the E781 data obtained from December 1996 to September 1997. We obtained the mass and width values for the c and c* bárions as: M c++ M c+ = 167.5 ± 0.5 ± 0.2MeV/c2, M c0 -- M c+ = 167.9 ± 0.7 ± 1.2 MeV/c2, M c++* M c+ = 237.4 ± 4.9 ± 3.1MeV/c2, M c0* -- M c+ = 232.6 ± 1.7 ± 1.3 MeV/c2, M c++- = 16.2 ± 7.8 ± 5.5MeV e M c0* = 9.1 ± 6.0 ± 6.2MeV. We also studied the hadroproduction for those states measuring the paramenter that characterizes the xf distribution. The values obtained are: n c++ = 2.57 ± 0.57 ± 0,45, n c0 = 1.37 ± 0,27 ± 0.43, n c++- = 2,13 ± 0,26 ± 0,61, n c0- =2.05 ± 0,35 ± 0,80. (AU)