![Direct Emission in K±→[pi]±[pi]0[gamma] PDF](https://books.google.com/books/content/images/frontcover/MIvPtAEACAAJ?fife=w150-h200)
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Languages : en
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Direct Emission in K±→[pi]±[pi]0[gamma]
![Direct Emission in K±→[pi]±[pi]0[gamma] PDF](https://books.google.com/books/content/images/frontcover/MIvPtAEACAAJ?fife=w80-h100)
Author: Measurement of Direct Photon Emission in Kappa + Pi + Pi 0 Gamma Decay
Author: S. AdlerStudy of the K to Pi Pi0 Gamma Decays at the NA48/2 Experiment at the CERN SPS
Author: Silvia Goy LópezPublisher:
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Languages : en
Pages : 201
Book Description
The NA48/2 experiment at the CERN SPS has collected a large sample of K to pi pi0 gamma decays.Two amplitudes contribute to these decays. The dominant one comes from Inner Bremsstrahlung (IB) in the K to pi pi0 process. The second one is given by the Direct Emission (DE) of the photon at the weak vertex from an intermediate state of the decay. The simplest radiative transitions are electric dipole (E1) and magnetic dipole (M1). Electric amplitudes can interfere with IB, and CP violation and possible non-SM effects can show up in th e corresponding interference (INT) term.In this work a sub sample of the data has been analyzed. About 120000 K to pi pi0 gamma decays, with negligible background contamination have been reconstructed in the ranges 0.2
Search for the Rare Decay K[L] [right Arrow] [pi]0[pi]0[gamma]
![Search for the Rare Decay K[L] [right Arrow] [pi]0[pi]0[gamma] PDF](https://books.google.com/books/content/images/frontcover/1CEqAAAAYAAJ?fife=w80-h100)
Author: David Edward SmithSearch For the Rare Decay K(L) ---] Pi0 Pi0 Gamma
![Search For the Rare Decay K(L) ---] Pi0 Pi0 Gamma PDF](https://books.google.com/books/content/images/frontcover/HmeaAQAACAAJ?fife=w80-h100)
Author: David Edward SmithPublisher:
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Languages : en
Pages : 141
Book Description
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.
Search for the Rare Decay K(L) ---] Pi0 Pi0 Gamma
![Search for the Rare Decay K(L) ---] Pi0 Pi0 Gamma PDF](https://books.google.com/books/content/images/frontcover/9FSuAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 4
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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.
Measurement of Direct Photon Emission in [Kappa] + → [pi] + [pi] O [gamma] Decay Using Stopped Positive Kaons
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Author: Direct Emission in K± → Π±π0Υ
Author: Saul BarshaySimultaneous Measurement of KS and KL Decays Into Π+π-γ
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Languages : en
Pages :
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With the E731 apparatus at Fermilab, we have simultaneously collected 6859 K(L) and K(S) decays into pi+pi-gamma. Using our sample of over 370000 pi+pi- decays for normalization we have determined that the ratio GAMMA(K0 --> pi+pi-gamma)/GAMMA(K0 --> pi+pi- ) is (23.0 +/- 0.7) x 10( -3) for K(L) and (7.10 +/- 0.22) x 10( -3) for K(S), for photon energies greater than 20 MeV in the kaon center of mass. After removing the inner-bremsstrahlung contribution, we find that the photon energy spectrum of the direct emission decay of the K(L) is consistent with the presence of a vector meson propagator in the form factor.
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