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B Lambda_b and Charm Results from the Tevatron
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Physics in Collision - Zeuthen, Germany, June 26-28, 2003
B, Λb and Charm Results from the Tevatron
Farrukh Azfar
Oxford University, Particle Physics Sub-department, 1 Keble Road, Oxford OX1 3RH, UK
ABSTRACT
Recent results on Bd, B
±
u , Bs, Λb and Charm hadrons are reported from ≈ 75pb
?1
and ≈ 40 pb?1 of data accumulated at the upgraded CDF and D0 experiments at
the Fermilab Tevatron p??p collider, during Run-II. These include lifetime and mass
measurements of B and Charm hadrons, searches for rare decays in charm and B
hadrons and CP-violation in Charm decays. Results relevant to CP-violation in
B-decays are also reported.
1
1 Tevatron p? p? collider and performance during Run-II
The Tevatron p ? p? collider is being used for extended data-taking for the second
time in 10 years. During the period between 1992 and 1996 (Run-I) an integrated
luminosity of 110pb?1 was delivered; the goals for the current period starting May
2001 (Run-II) are 2 fb?1, which is a × 20 increase over Run-I. The upgrades for Run-
II consist of a new injection stage delivering more protons, an increased p? transfer
efficiency and a p? recycler (undergoing commisioning) that uses remaining p? from
the previous store. A table of Run-I and Run-II operating parameters is given in
table 1. The peak luminosity, though improving, is still × 4 below target.
Table 1: Tevatron Performance Improvement Run-I vs. Run-II.
Collision Rate Bunches Center of Mass Energy Peak Luminosity
Run-I: 3.5μs (Run-I) 6x6 1.8 TeV/c2 2.4x1031
Run-II: 396 ns 36x36 1.96 Tev/c2 4.4x1031
2 B Physics at Hadron Colliders: The CDF and D0 Detectors
The bb? production cross section σ(bb?) is ≈ 150μb at p? p? at the Tevatron, 1 nb at
the Υ(4s) and 7 nb at the Z0. All B-hadrons are produced at the Tevatron (unlike
the B factories), the drawback being the inelastic cross section which is 1000×σ(bb?)
making online data selection crucial.
The CDF [1] and D0 detectors [2
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