Baratt, Arie
(2004)
Branching Ratios of the Charged Kaon Decays and Radiative Corrections for the Ke3 Decay Mode.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)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.
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| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| 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: |
http://etd.library.pitt.edu/ETD/available/etd-05072004-104653/, etd-05072004-104653 |
| Date Deposited: |
10 Nov 2011 19:43 |
| Last Modified: |
15 Nov 2016 13:43 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/7815 |
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