DISCOVERY AND MEASUREMENT OF EXCITED B HADRONS AT THE COLLIDER DETECTOR AT FERMILAB
Pursley, Jennifer M.
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This thesis presents evidence for the B∗∗0 and S(∗)± b hadrons in proton-antiproton collisions at a center of mass energy of 1.96 TeV, using data collected by the Collider Detector at Fermilab. In the search for B∗∗0→B±p∓, two B± decay modes are reconstructed: B±→J/yK±, where J/y→μ+μ−, and B± → ¯D0p±, where ¯D0 →K±p∓. Both modes are reconstructed using 370±20 pb−1 of data. Combining the B± meson with a charged pion to reconstruct B∗∗0 led to the observation and measurement of the masses of the two narrow B∗∗0 states, B01 and B∗0 2 , of m(B01 ) = 5734±3 (stat.) ±2 (syst.) MeV/c2 m(B∗0 2 ) = 5738±5 (stat.) ±1 (syst.) MeV/c2 In the search for S(∗)± b →L0b p±, the L0b is reconstructed in the decay mode L0b →L+ c p−, where L+ c → pK−p+, using 1070±60 pb−1 of data. Upon combining the L0b candidate with a charged pion, all four of the S(∗)± b states are observed and their masses measured to be: m(S+ b ) = 5807.8+2.0 −2.2 (stat.)±1.7 (syst.) MeV/c2 m(S−b ) = 5815.2±1.0 (stat.)±1.7 (syst.) MeV/c2 m(S∗+ b ) = 5829.0+1.6 −1.8 (stat.)+1.7 −1.8 (syst.) MeV/c2 m(S∗− b ) = 5836.4±2.0 (stat.)+1.8 −1.7 (syst.) MeV/c2 This is the first observation of the S(∗)± b baryons.