# Tesi etd-09242013-231307

Thesis type
Tesi di dottorato di ricerca
Author
LEO, SABATO
URN
etd-09242013-231307
Title
Measurement of CP violation in Bs--> J/psi Phi decays using the full CDF data set
Settore scientifico disciplinare
FIS/01
Corso di studi
SCIENZE DI BASE
Supervisors
tutor Punzi, Giovanni
relatore Tonelli, Diego
Parole chiave
• CPV mixing phase
Data inizio appello
27/09/2013;
Consultabilità
Completa
Riassunto analitico
We report on the final measurement of the \CP-violating \Bs\ mixing phase \betas\ in $\sqrt{s}=$1.96 TeV proton-antiproton
collisions collected with the Collider Detector at the Fermilab Tevatron collider. Using a sample corresponding
to 9.6\,\lumifb\ of integrated luminosity, we fit
the decay-time evolution of $B^0_s \rightarrow J/\psi (\rightarrow \mu^+ \mu^-) \phi (\rightarrow K^+ K^-)$ decays in which the $b$-quark content at production and the \CP\ parity
of the final state are identified.
The interference of decays with and without mixing renders the \Bs\ mixing phase observable.
The phase is determined to be $-0.06<\betas <0.30$ at 68\% confidence level.
The decay-width difference between heavy and light \Bs\ eigenstates, and the average \Bs\ lifetime are also determined to be \DGs $= 0.068 \pm 0.027$ $\rm{ps^{-1}}$ and
$\tau_s\,=1.528 \pm 0.021$ $\rm{ps}$, respectively.
These results are among the world's most precise from a single experiment, and compatible with standard model predictions.
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