Please use this identifier to cite or link to this item: http://hdl.handle.net/10077/8586
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dc.contributor.advisorRescigno, Marcoit_IT
dc.contributor.advisorZanetti, Anna Mariait_IT
dc.contributor.advisorVitale, Lorenzoit_IT
dc.contributor.authorDorigo, Mircoit_IT
dc.date.accessioned2013-04-16T08:17:34Z-
dc.date.available2013-04-16T08:17:34Z-
dc.date.issued2013-04-11it_IT
dc.identifier.urihttp://hdl.handle.net/10077/8586-
dc.description2011/2012it_IT
dc.description.abstractWe present a search for physics beyond the standard model (SM) through a measurement of the violation of the charge-parity (CP) symmetry in two decays of the Bs meson using data collected by the Collider Detector at Fermilab (CDF) in proton-antiproton collisions at the center-of-mass energy of 1.96 Tev. We exploit the decays Bs->Jpsi (->mu mu) phi(-> KK) and Bs -> phi(-> KK) phi(-> KK), for which the SM accurately predicts very small or vanishing CP violation; both decay modes are very sensitive to new sources of CP violation expected in a broad class of SM extensions. We analyze the time-dependent CP asymmetry of the Bs->Jpsi phi decays collected in the full CDF Run II dataset for providing the final measurement of the Bs-antiBs mixing phase, 2*betas, and we present the first measurement of CP violation in Bs -> Phi Phi decays, through the determination of two time-integrated CP asymmetries, Av and Au, using an original method developed in this work. We find: -0.06< betas<0.30 at the 68% confidence level; Av=(-12.0 +/-6.4(stat) +/- 1.6(syst))%; and Au=(-0.7 +/-6.4(stat) +/- 1.8(syst))%. In addition, we provide measurements of the decay width difference between the light and heavy mass eigenstates of the Bs meson, DeltaGamma_s=0.068 +/- 0.026(stat) +/- 0.009(syst) ps^{-1}; and of their mean lifetime, tau_s=1.528 +/- 0.019(stat) +/- 0.009(syst) ps. All results are among the most precise determinations from a single experiment and exhibit an excellent agreement with the SM predictions. They have been published in two letters in Physical Review.it_IT
dc.language.isoenit_IT
dc.publisherUniversità degli studi di Triesteit_IT
dc.rights.urihttp://www.openstarts.units.it/dspace/default-license.jsp-
dc.subjectCDF experimentit_IT
dc.subjectB physicsit_IT
dc.subjectCP violationit_IT
dc.subjectTevatron colliderit_IT
dc.subjectBs mesonit_IT
dc.subject.classificationSCUOLA DI DOTTORATO DI RICERCA IN FISICAit_IT
dc.titleSearch for New Physics in the Bs -> J/psi phi and Bs -> phi phi decays at CDFit_IT
dc.typeDoctoral Thesis-
dc.subject.miurFIS/04 FISICA NUCLEARE E SUBNUCLEAREit_IT
dc.description.cycleXXV Cicloit_IT
dc.rights.statementNO EMBARGOit_IT
dc.identifier.nbnurn:nbn:it:units-9991-
dc.description.birth1985-
item.grantfulltextopen-
item.languageiso639-1other-
item.fulltextWith Fulltext-
Appears in Collections:Scienze fisiche
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