DISCOVERY AND MEASUREMENT OF EXCITED B HADRONS AT THE COLLIDER DETECTOR AT FERMILAB
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Date
2008-02-13T20:48:01Z
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Publisher
Johns Hopkins University
Abstract
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.