![Measurement of Direct Photon Emission in [Kappa] + → [pi] + [pi] O [gamma] Decay Using Stopped Positive Kaons PDF](https://books.google.com/books/content/images/frontcover/VCNctwAACAAJ?fife=w150-h200)
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Languages : en
Pages : 12
Book Description
Measurement of Direct Photon Emission in [Kappa] + → [pi] + [pi] O [gamma] Decay Using Stopped Positive Kaons
![Measurement of Direct Photon Emission in [Kappa] + → [pi] + [pi] O [gamma] Decay Using Stopped Positive Kaons PDF](https://books.google.com/books/content/images/frontcover/VCNctwAACAAJ?fife=w80-h100)
Author: Measurement of Direct Photon Emission in Kappa + Pi + Pi 0 Gamma Decay
Author: S. AdlerSimultaneous Measurement of KS and KL Decays Into Π+π-γ
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Languages : en
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Book Description
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.
The Search for the CP-violating Emission of an E1 Photon from the K [L] [arrow] [pi]+[pi]−[gamma] Decay
![The Search for the CP-violating Emission of an E1 Photon from the K [L] [arrow] [pi]+[pi]−[gamma] Decay PDF](https://books.google.com/books/content/images/frontcover/MiEqAAAAYAAJ?fife=w80-h100)
Author: John Michael ShieldsPublisher:
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Languages : en
Pages : 328
Book Description
Branching Ratio for Pion-beta Decay: [pi]+ --> [pi]0 + [epsilon]+ + [gamma]
![Branching Ratio for Pion-beta Decay: [pi]+ --> [pi]0 + [epsilon]+ + [gamma] PDF](https://books.google.com/books/content/images/frontcover/g2eZVNhHjr8C?fife=w80-h100)
Author: Robert Bruce BacastowPublisher:
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Languages : en
Pages : 62
Book Description
Direct Photons from Psi(3100) Decay
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Languages : en
Pages :
Book Description
New results are presented from the Lead Glass Wall experiment (SP26) at SPEAR. Motivation was due to recent Quantum Chromodynamics (QCD) calculations, for the .gamma. + 2 gluons decay mode of orthocharmonium, to search for direct photons from psi(3100) decay. Inclusive .gamma. and .pi.° production from psi(3100) decay was measured using the Lead Glass Wall addition to the Mark I detector. .pi.° and charged .pi. production are compared and the .pi.° decay contribution to the inclusive .gamma. spectrum calculated. An excess of .gamma.'s was found which is partly explained by eta production and decay, but a signal of high energy direct photons remains. This excess of direct photons is compared with QCD predictions and previously measured radiative decays of the psi(3100).
Measuring the Photon Polarization in Radiative B --] K-pi-pi-gamma
![Measuring the Photon Polarization in Radiative B --] K-pi-pi-gamma PDF](https://books.google.com/books/content/images/frontcover/59PJjwEACAAJ?fife=w80-h100)
Author: Publisher:
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Languages : en
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Book Description
We propose a way of measuring the photon polarization in radiative B decays into K resonance states decaying to K[pi][pi], which can test the Standard Model and probe new physics. The photon polarization is shown to be measured by the up-down asymmetry of the photon direction relative to the K[pi][pi] decay plane in the K resonance rest frame. The integrated asymmetry in K[sub 1](1400)[yields] K[pi][pi], calculated to be 0.25, is measurable at currently operating B factories.
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/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.
The Search for the CP-violating Emission of an E1 Photon from the K(L) ---] Pi+ Pi- Gamma Decay
![The Search for the CP-violating Emission of an E1 Photon from the K(L) ---] Pi+ Pi- Gamma Decay PDF](https://books.google.com/books/content/images/frontcover/eNHTjwEACAAJ?fife=w80-h100)
Author: 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)
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
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.