Final Results From The Ktev Experiment On The Decay K L Pi0 Gamma Gamma

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Final Results From The Ktev Experiment On The Decay K L Pi0 Gamma Gamma

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Author :
language : en
Publisher:
Release Date : 2008

Final Results From The Ktev Experiment On The Decay K L Pi0 Gamma Gamma written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

The authors report on a new measurement of the branching ratio B(K{sub L} → [pi]°[gamma][gamma]) using the KTeV detector. They reconstruct 1982 events with an estimated background of 608, that results in B(K{sub L} → [pi]°[Gamma][gamma]) = (1.29 ± 0.03{sub stat} ± 0.05{sub syst}) x 10−6. They also measure the parameter, a{sub V}, which characterizes the strength of vector meson exchange terms in this decay. They find a{sub V} = -0.31 ± 0.05{sub stat} ± 0.07{sub syst}. These results utilize the full KTeV data set collected from 1997 to 2000 and supersede earlier KTeV measurements of the branching ratio and a{sub V}.

Search For The Rare Decay K L Right Arrow Pi 0 Pi 0 Gamma

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Author : David Edward Smith
language : en
Publisher:
Release Date : 2006

Search For The Rare Decay K L Right Arrow Pi 0 Pi 0 Gamma written by David Edward Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

Study On The Decay Of Kl To Pi0 Gamma Gamma

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Author : Jianbo Wang
language : en
Publisher:
Release Date :

Study On The Decay Of Kl To Pi0 Gamma Gamma written by Jianbo Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

We study on the rare decay

A Measurement Of The Branching Ratio Of The Pi 0 Dalitz Decay Using K L 2 3 Pi 0 Decays From Ktev

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Author :
language : en
Publisher:
Release Date : 2007

A Measurement Of The Branching Ratio Of The Pi 0 Dalitz Decay Using K L 2 3 Pi 0 Decays From Ktev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

The authors present a measurement of B([pi]0 2!e+e-[gamma])/B([pi]0 2![gamma][gamma]) using data taken in 1999 by the E832 KTeV experiment at Fermilab. The [pi]0s were produced by KL decays in flight that are fully reconstructed. They find 63,693 KL 2!3[pi]0 2![gamma][gamma] [gamma][gamma] e+e-[gamma] decays in KTeV data (an increase of a factor of ~ 20 in event statistics over previous experiments), and normalize to KL 2!3[pi]0 2!6[gamma], to extract B([pi]0 2!e+e-[gamma], me+e-> 15 MeV/c2

Search For The Rare Decay K L Pi0 Pi0 Gamma

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Author :
language : en
Publisher:
Release Date : 2007

Search For The Rare Decay K L Pi0 Pi0 Gamma written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

The KTeV E799 experiment has conducted a search for the rare decay K{sub L} 2![pi]°°[gamma] via the topology K{sub L} 2![pi]°[pi]°{sub D}[gamma] (where [pi]°{sub D} 2![gamma]ee−). Due to Bose statistics of the [pi]° pair and the real nature of the photon, the K{sub L} 2![pi]°[pi]°[gamma] decay is restricted to proceed at lowest order by the CP conserving direct emission (DE) of an E2 electric quadrupole photon. The rate of this decay is interesting theoretically since chiral perturbation theory predicts that this process vanishes at level O(p4). Therefore, this mode probes chiral perturbation theory at O(p6). In this paper we report a determination of an upper limit of 2.43 x 10−7 (90% CL) for K{sub L} 2![pi]°[pi]°[gamma]. This is approximately a factor of 20 lower than previous results.

Search For The Decay Kl To Pi0 E E And Study Of The Decay Kl To E E Gamma Gamma

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Author : Peter L. Mikelsons
language : en
Publisher:
Release Date : 1999

Search For The Decay Kl To Pi0 E E And Study Of The Decay Kl To E E Gamma Gamma written by Peter L. Mikelsons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Broken symmetry (Physics) categories.

Study Of The Rare Decay K L Pi0 Gamma Gamma At Ktev

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Author :
language : en
Publisher:
Release Date : 2007

Study Of The Rare Decay K L Pi0 Gamma Gamma At Ktev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

The authors study on the rare decay K{sub L} 2![pi]°[gamma][gamma], measure a{sub V}, and branching ratio by analyzing 96, 97 and 99 data. The measurements were taken by KTeV at Fermi National Accelerator Laboratory. After all cuts, they have 1982 K{sub L} 2![pi]°[gamma][gamma] candidate. The background level is estimated as 30%. K{sub L} 2![pi]°[gamma][gamma] branching ratio is measured as (1.29 ± 0.03(stat) ± 0.04(sys)) x 10−6. By using D'Ambrosio's theory to fit a{sub V}, a{sub V} = -( -0.31 ± 0.05(stat) ± 0.07(sys)).

Epsilon Prime Epsilon And Rare Kl Decays From Ktev Experiment

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Author :
language : en
Publisher:
Release Date : 2001

Epsilon Prime Epsilon And Rare Kl Decays From Ktev Experiment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

The authors update the current status for the measurement of the direct-CP violation parameters????????/? in the KTeV experiment at Fermilab. Substantial statistics have been accumulated during the 1996-7 run and 1999 run for both????????/? and rare K{sub L} decay searches. The first KTeV result on????????/? published last year was Re(????????/?) = (28.0 ± 4.1) x 10{sup −4} based on the 23% data from 1996-7 run. Combining with the previous E731, NA31 and the recent preliminary NA48 results, the grand average is Re(????????/?) = (19.3 ± 3.6) x 10{sup −4} (with S = 1:49), more than 5? above zero. More data from both KTeV and NA48 after completing the analysis will further improve the precision of this measurement in the near future and hopefully further improve the agreement. New results on the branching ratio and form factor measurements of K{sub L} →??{sup −}? using 1997 data are also presented. We find that BR(K{sub L} →?+?{sup −}?) = (3.66 ± 0.04{sub stat} ± 0.07{sub syst}) x 10{sup −7}. The form factor parameter?{sub K}* is measured to be?{sub K}* = −0.157{sub −0.027}{sup +0.025}. We make the first measurement of the parameter? from the D'Ambrosio, Isidori, and Portoles form factor, finding? = −1.53 ± 0.09. This measurement of? limits the CKM parameter?> −0.2.

Twist N Learn

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language : en
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Twist N Learn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

Search For The Rare Decay K L Pi0 Pi0 Gamma

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Author : David Edward Smith
language : en
Publisher:
Release Date : 2006

Search For The Rare Decay K L Pi0 Pi0 Gamma written by David Edward Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

This thesis describes a search for the rare decay K{sub L} {yields} {pi}{sup 0}{pi}{sup 0}{gamma} using data from the KTeV experiment, using the topology K{sub L} {yields} {pi}{sup 0}{pi}{sub D}{sup 0}{gamma} (where {pi}{sub D}{sup 0} {yields} {gamma}e{sup +}e{sup -}). Due to Bose statistics and the real nature of the photon, the K{sub L} {yields} {pi}{sup 0}{pi}{sup 0}{gamma} decay can proceed at lowest order only by the Cp conserving direct emission of an E2 photon. The decay vanishes to O(p{sup 4}) in chiral perturbation theory and is a probe of the theory to the sixth order. The primary background to this decay consists of K{sub L} {yields} {pi}{sup 0}{pi}{sup 0}{pi}{sub D}{sup 0} events with one lost photon. The upper limit for the decay K{sub L} {yields} {pi}{sup 0}{pi}{sup 0}{gamma} presented in this thesis is 2.32 x 10{sup -7} at the 90% confidence level. This upper limit was derived from both 1997 and 1999 data, using a blind analysis. The upper limit was derived from a Feldman-Cousins method, based on a weighted total of 0.53 data events in the signal region with an expected K{sub L} {yields} {pi}{sup 0}{pi}{sup 0}{pi}{sub D}{sup 0} background of 0.37 {+-} 0.28 events. The previous upper limit for this decay was 5.6 x 10{sup -6} at the 90% confidence level.