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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.

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    Abstract

    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
    Creators/Authors:
    CreatorsEmailORCID
    Baratt, Ariearbst27@pitt.edu
    ETD Committee:
    ETD Committee TypeCommittee MemberEmailORCID
    Committee ChairThompson, Julia Ajth@pitt.edu
    Committee MemberSwanson, Eric Sswansone@pitt.edu
    Committee MemberWilley, Raymond Swilley@willey.phyast.pitt.edu
    Committee MemberLevitan, Steven Psteve@ee.pitt.edu
    Committee MemberSavinov, Vladimir Pvps3@pitt.edu
    Title: Branching Ratios of the Charged Kaon Decays and Radiative Corrections for the Ke3 Decay Mode
    Status: Unpublished
    Abstract: 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.
    Date: 18 October 2004
    Date Type: Completion
    Defense Date: 24 February 2004
    Approval Date: 18 October 2004
    Submission Date: 07 May 2004
    Access Restriction: No restriction; The work is available for access worldwide immediately.
    Patent pending: No
    Institution: University of Pittsburgh
    Thesis Type: Doctoral Dissertation
    Refereed: Yes
    Degree: PhD - Doctor of Philosophy
    URN: etd-05072004-104653
    Uncontrolled Keywords: branching ratio; charged kaon; CKM matrix; CMD-2; elementary particles; high energy; Phi factory; radiative corrections; semileptonic decay; VEPP-2M
    Schools and Programs: Faculty of Arts and Sciences > Physics
    Date Deposited: 10 Nov 2011 14:43
    Last Modified: 06 Jun 2012 11:55
    Other ID: http://etd.library.pitt.edu/ETD/available/etd-05072004-104653/, etd-05072004-104653

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