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Title: New measurements from fully reconstructed hadronic final states of the $$B^0_2$$ meson at CDF II experiment

Abstract

This thesis reports the reconstruction and lifetime measurement of B +, B$$0/atop{d}$$ and B$$0/atop{s}$$ mesons, performed using fully reconstructed hadronic decays collected by a dedicated trigger at CDF II experiment. This dedicated trigger selects significantly displaced tracks from primary vertex of p$$\bar{p}$$ collisions generated at Tevatron collider, obtaining, in this way, huge data samples enriched of long-lived particles, and is therefore suitable for reconstruction of B meson in hadronic decay modes. Due to the trigger track impact parameter selections, the proper decay time distributions of the B mesons no longer follow a simply exponential decay law. This complicates the lifetime measurement and requires a correct understanding and treatment of all the involved effects to keep systematic uncertainties under control. This thesis presents a method to extract the lifetime of B mesons in “ct- biased” samples, based on a Monte Carlo approach, to correct for the effects of the trigger and analysis selections. We present the results of this method when applied on fully re- constructed decays of B collected by CDF II in the data taking runs up to August 2004, corresponding to an integrated luminosity of about 360 pb -1. The lifetimes are extracted using the decay modes B + → $$\bar{D}$$ 0π +,B$$0\atop{d}$$ → D -π +, B$$0\atop{d}$$ → D -π +π -π +, B$$0\atop{s}$$ → D$$-\atop{s}$$π + and B$$0\atop{s}$$ → D$$-\atop{s}$$ π +π -π +(and c.c.) and performing combined mass-lifetime unbinned maximum likelihood fits.

Authors:
 [1]
  1. Univ. of Padua (Italy)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1345596
Report Number(s):
FERMILAB-THESIS-2006-96
1515446
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Da Ronco, Saverio. New measurements from fully reconstructed hadronic final states of the $B^0_2$ meson at CDF II experiment. United States: N. p., 2006. Web. doi:10.2172/1345596.
Da Ronco, Saverio. New measurements from fully reconstructed hadronic final states of the $B^0_2$ meson at CDF II experiment. United States. doi:10.2172/1345596.
Da Ronco, Saverio. Sun . "New measurements from fully reconstructed hadronic final states of the $B^0_2$ meson at CDF II experiment". United States. doi:10.2172/1345596. https://www.osti.gov/servlets/purl/1345596.
@article{osti_1345596,
title = {New measurements from fully reconstructed hadronic final states of the $B^0_2$ meson at CDF II experiment},
author = {Da Ronco, Saverio},
abstractNote = {This thesis reports the reconstruction and lifetime measurement of B+, B$0/atop{d}$ and B$0/atop{s}$ mesons, performed using fully reconstructed hadronic decays collected by a dedicated trigger at CDF II experiment. This dedicated trigger selects significantly displaced tracks from primary vertex of p$\bar{p}$ collisions generated at Tevatron collider, obtaining, in this way, huge data samples enriched of long-lived particles, and is therefore suitable for reconstruction of B meson in hadronic decay modes. Due to the trigger track impact parameter selections, the proper decay time distributions of the B mesons no longer follow a simply exponential decay law. This complicates the lifetime measurement and requires a correct understanding and treatment of all the involved effects to keep systematic uncertainties under control. This thesis presents a method to extract the lifetime of B mesons in “ct- biased” samples, based on a Monte Carlo approach, to correct for the effects of the trigger and analysis selections. We present the results of this method when applied on fully re- constructed decays of B collected by CDF II in the data taking runs up to August 2004, corresponding to an integrated luminosity of about 360 pb-1. The lifetimes are extracted using the decay modes B+ → $\bar{D}$0π+,B$0\atop{d}$ → D-π+, B$0\atop{d}$ → D-π+π-π+, B$0\atop{s}$ → D$-\atop{s}$π+ and B$0\atop{s}$ → D$-\atop{s}$ π+π-π+(and c.c.) and performing combined mass-lifetime unbinned maximum likelihood fits.},
doi = {10.2172/1345596},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Thesis/Dissertation:
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