Study of Charged Particle Species Produced in Association with $$\bar{B}$$⁰, B^-, and $$\bar{B}$$$$0\atop{s}$$ Mesons in p$$\bar{p}$$ collisions at √s = 1.96-TeV

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 2005

DOI:https://doi.org/10.2172/879107· OSTI ID:879107

Usynin, Denys ^[1]

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1. Univ. of Pennsylvania, Philadelphia, PA (United States)

The authors study the yields of charged kaons, charged pions, and protons produced in association with B mesons produced in proton-antiproton collisions at center of mass energy 1960 GeV using 355 pb^-1 of data collected with the CDF detector at the Fermilab Tevatron. This is the first reported measurements of these yields at a hadron collider. The B mesons are reconstructed using their semileptonic decays: B⁰ → ℓ⁺D^-X, D^- → K⁺π^-π^-; B⁰ → ℓ⁺D*^-X, D*^- → π^-$$\bar{D}$$⁰,$$\bar{D}$$⁰ → K⁺π^-; B⁺ → ℓ⁺$$\bar{D}$$⁰X, $$\bar{D}$$⁰ → K⁺π^-; B_s→ℓ⁺D$$-\atop{s}$$ X, D$$-\atop{s}$$ → π^-Φ,Φ → K⁺K^-. The K, π, and p are identified using the Time of Flight detector (TOF), the CDF spectrometer, and the specific ionization (dE/dx) measured in the central drift chamber (COT). The fraction of charged kaons produced in association with $$\bar{B}$$$$0\atop{s}$$ mesons is found to be larger than the fraction produced in association with the $$\bar{B}$$$$0\atop{s}$$ and B^- mesons, as expected from naive models of heavy quark hadronization to mesons. The particle species yields are found to be in qualitative agreement with simulation of B meson production in hadron collisions from the PYTHIA Monte Carlo, although the yield of kaons around $$\bar{B}$$$$0\atop{s}$$ mesons is found to be larger in the simulation when compared to the data. These studies are important for understanding methods of identifying the flavor of $$\bar{B}$$$$0\atop{s}$$ mesons in measurement of $$\bar{B}$$$$0\atop{s}$$ flavor oscillations and charge conjugation-parity (CP) violation in $$\bar{B}$$$$0\atop{s}$$ meson decays.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 879107
• Report Number(s): FERMILAB-THESIS-2005-68; TRN: US0700899
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
CHARGED PARTICLES
DRIFT CHAMBERS
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
HADRONS
IONIZATION
KAONS
MESONS
OSCILLATIONS
PIONS
PRODUCTION
PROTONS
QUARKS
SEMILEPTONIC DECAY
SIMULATION
Experiment-HEP