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Title: Lifetime difference in the B$$0\atop{s}$$ system from untagged B$$0\atop{s}$$ → J/ΨΦ decay at √s= 1.96 TeV at D0 detector

Abstract

In this dissertation, they present a study of the untagged decay of B$$0\atop{s}$$ → J/ΨΦ, the final state of which is a superposition of the CP-even and CP-odd states. Within the framework of the standard model (SM), to a good approximation, the two CP eigenstates of the (B$$0\atop{s}$$, $$\bar{B}$$$0\atop{s}$$) system are equivalent to mass eigenstates. The data collected by the D0 detector between June 2002 to August 2004 (an integrated luminosity of approximately 450 pb -1) has been used for the analysis presented in this thesis. From a simultaneous fit to the B$$0\atop{s}$$ candidate mass, lifetime, and the angular distribution of the decay products, they obtain the CP-odd fraction in the final state at production time to be 0.16 ±} 0.10(stat) ± 0.02(syst). The average lifetime of the (B$$0\atop{s}$$, $$\bar{B}$$$0\atop{s}$$) system is measured to be 1.39$$+0.13\atop{-0.16}$$(stat)$$+0.01\atop{-0.02}$$(syst) ps, with the relative width difference between the heavy and light mass eigenstates, Δγ/$$\bar{γ}$$ = (γ LH)/$$\bar{γ}$$ = 0.24$$+0.16\atop{-0.38}$$(stat)$$+0.03\atop{-0.04}$$(syst). With the additional constraint from the world average of the B$$0\atop{s}$$ lifetime measurements using semileptonic decays, they find average lifetime of the (B$$0\atop{s}$$, $$\bar{B}$$$0\atop{s}$$) system 1.39 ± 0.06 ps with Δγ/$$\bar{γ}$$ = 0.25$$+0.14\atop{-0.15}$$. They have also done B 0 lifetime measurement for its analogous decay mode to J/Ψ}K*. With this measurement they get B 0 lifetime 1.530 ± 0.043(stat) ± 0.023(syst) ps. Using above results, they get 0.91 ± 0.09(stat) ± 0.003(syst), for the ratio of the B$$0\atop{s}$$ and B 0 lifetimes ($$\bar{γ}$$(B$$0\atop{s}$$)/γ(B 0)). These measurements are consistent with the predictions of SM within the measurement uncertainty.

Authors:
 [1]
  1. Tata Inst. of Fundamental Research (TIFR), Mumbai (India)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
907797
Report Number(s):
FERMILAB-THESIS-2006-40
TRN: US0703314
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; DAUGHTER PRODUCTS; DECAY; EIGENSTATES; LIFETIME; LUMINOSITY; PRODUCTION; SEMILEPTONIC DECAY; STANDARD MODEL; Experiment-HEP

Citation Formats

Chandra, Avdhesh. Lifetime difference in the B$0\atop{s}$ system from untagged B$0\atop{s}$ → J/ΨΦ decay at √s= 1.96 TeV at D0 detector. United States: N. p., 2006. Web. doi:10.2172/907797.
Chandra, Avdhesh. Lifetime difference in the B$0\atop{s}$ system from untagged B$0\atop{s}$ → J/ΨΦ decay at √s= 1.96 TeV at D0 detector. United States. doi:10.2172/907797.
Chandra, Avdhesh. Sun . "Lifetime difference in the B$0\atop{s}$ system from untagged B$0\atop{s}$ → J/ΨΦ decay at √s= 1.96 TeV at D0 detector". United States. doi:10.2172/907797. https://www.osti.gov/servlets/purl/907797.
@article{osti_907797,
title = {Lifetime difference in the B$0\atop{s}$ system from untagged B$0\atop{s}$ → J/ΨΦ decay at √s= 1.96 TeV at D0 detector},
author = {Chandra, Avdhesh},
abstractNote = {In this dissertation, they present a study of the untagged decay of B$0\atop{s}$ → J/ΨΦ, the final state of which is a superposition of the CP-even and CP-odd states. Within the framework of the standard model (SM), to a good approximation, the two CP eigenstates of the (B$0\atop{s}$, $\bar{B}$$0\atop{s}$) system are equivalent to mass eigenstates. The data collected by the D0 detector between June 2002 to August 2004 (an integrated luminosity of approximately 450 pb-1) has been used for the analysis presented in this thesis. From a simultaneous fit to the B$0\atop{s}$ candidate mass, lifetime, and the angular distribution of the decay products, they obtain the CP-odd fraction in the final state at production time to be 0.16 ±} 0.10(stat) ± 0.02(syst). The average lifetime of the (B$0\atop{s}$, $\bar{B}$$0\atop{s}$) system is measured to be 1.39$+0.13\atop{-0.16}$(stat)$+0.01\atop{-0.02}$(syst) ps, with the relative width difference between the heavy and light mass eigenstates, Δγ/$\bar{γ}$ = (γL/γH)/$\bar{γ}$ = 0.24$+0.16\atop{-0.38}$(stat)$+0.03\atop{-0.04}$(syst). With the additional constraint from the world average of the B$0\atop{s}$ lifetime measurements using semileptonic decays, they find average lifetime of the (B$0\atop{s}$, $\bar{B}$$0\atop{s}$) system 1.39 ± 0.06 ps with Δγ/$\bar{γ}$ = 0.25$+0.14\atop{-0.15}$. They have also done B0 lifetime measurement for its analogous decay mode to J/Ψ}K*. With this measurement they get B0 lifetime 1.530 ± 0.043(stat) ± 0.023(syst) ps. Using above results, they get 0.91 ± 0.09(stat) ± 0.003(syst), for the ratio of the B$0\atop{s}$ and B0 lifetimes ($\bar{γ}$(B$0\atop{s}$)/γ(B0)). These measurements are consistent with the predictions of SM within the measurement uncertainty.},
doi = {10.2172/907797},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

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