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Branching Ratios of the Charged Kaon Decays and Radiative Corrections for the Ke3 Decay Mode

Baratt, Arie (2004) Branching Ratios of the Charged Kaon Decays and Radiative Corrections for the Ke3 Decay Mode. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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The CMD--2 experiment at the VEPP-2M accelerator at the Budker Institute ofNuclear Physics has collected $approx$ 1 million charged kaon decays, from which we extract a clean sample of $approx 74,000 K^+ $ decays, with $approx$ 50,000 $kmunu$, 18,000 $kpipi$, 4000 ($kmu3 + ke3$), and 2000 ($k3pc + 3pi0$) events. Based on these samples we present measurement of$ R_{2body} equiv Br(kpipi)/Br(kmunu) = 0.3292 pm 0.0048 mbox{stat} pm 0.011 mbox{sys}$, $R_{semilep} equiv (Br(kmu3) + Br(ke3))/Br(kpipi) = 0.477 pm 0.016 mbox{stat} pm 0.10 mbox{sys}$, and$R_{3pion} equiv (Br(k3pc)+Br(3pi0))/Br(kpipi) = 0.315 pm 0.014 mbox{stat} pm 0.054 mbox{sys}$. The ratio of the two semileptonic decays is extracted from the $K^-$ decays only and yields $R_{emu} equiv Br(K o pi^0 e u)/Br(K o pi^0 mu u) = 1.97 pm 0.09 mbox{stat} pm 0.81 mbox{sys}$. The strength of these measurements is the presence of all the major decay modes and systematics different from some other experiments.In this dissertation I also consider the radiative correctionsfor the $K_{e3}$ decay. This decay is of particular importance since it provides the best way to extract the value of the $V_{us}$ element of the CKM matrix. In turn, precise knowledge of $V_{us}$ is needed to resolve a long standing problem with a unitarity test of the CKM matrix.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Baratt, Ariearbst27@pitt.eduARBST27
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairThompson, Julia Ajth@pitt.eduJTH
Committee MemberSwanson, Eric Sswansone@pitt.eduSWANSONE
Committee MemberWilley, Raymond
Committee MemberLevitan, Steven Psteve@ee.pitt.eduLEVITAN
Committee MemberSavinov, Vladimir Pvps3@pitt.eduVPS3
Date: 18 October 2004
Date Type: Completion
Defense Date: 24 February 2004
Approval Date: 18 October 2004
Submission Date: 7 May 2004
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Faculty of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: branching ratio; charged kaon; CKM matrix; CMD-2; elementary particles; high energy; Phi factory; radiative corrections; semileptonic decay; VEPP-2M
Other ID:, etd-05072004-104653
Date Deposited: 10 Nov 2011 19:43
Last Modified: 15 Nov 2016 13:43


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