Measuring the Branching Ratio of the Rare Decay Pi0 --] E+ E-
Title | Measuring the Branching Ratio of the Rare Decay Pi0 --] E+ E- PDF eBook |
Author | Rune Niclasen |
Publisher | |
Pages | 124 |
Release | 2006 |
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A precise branching ratio measurement of the rare decay {pi}{sup 0} {yields} e{sup +}e{sup -} has been made. The measurement was made with the rare kaon decay experiment KTeV at Fermilab where the source of {pi}{sup 0}s was K{sub L} {yields} {pi}{sup 0}{pi}{sup 0}{pi}{sup 0} decaying in flight. A total of 794 fully reconstructed K{sub L} {yields} 3{pi}{sup 0} events consistent with two of the intermediate {pi}{sup 0}s decaying into {gamma}{gamma} and one into e{sup +}e{sup -} were collected. An estimated 53.2 {+-} 11.0 of these events were expected to be background. Normalizing to the {pi}{sup 0} Dalitz decay they found Br({pi}{sup 0} {yields} e{sup +}e{sup -}, (m{sub e{sup +}e{sup -}}/m{sub {pi}{sup 0}}){sup 2}> 0.95) = (6.44 {+-} 0.25(stat) {+-} 0.22(syst)) x 10{sup -8} where internal radiation, {pi}{sup 0} {yields} e{sup +}e{sup -}({gamma}), was limited by the requirement (m{sub e{sup +}e{sup -}}/m{sub {pi}{sup 0}}){sup 2}> 0.95 which separated it from the tree level Dalitz decay, {pi}{sup 0} {yields} e{sup +}e{sup -}P{gamma}.
Measuring the Branching Ratio of the Rare Decay ?0{u2192}e+e-.
Title | Measuring the Branching Ratio of the Rare Decay ?0{u2192}e+e-. PDF eBook |
Author | |
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Pages | 124 |
Release | 2006 |
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A precise branching ratio measurement of the rare decay ?0→e+e- has been made. The measurement was made with the rare kaon decay experiment KTeV at Fermilab where the source of ?0s was KL → ?0?0?0 decaying in flight. A total of 794 fully reconstructed KL → 3?0 events consistent with two of the intermediate ?0s decaying into ?? and one into e+e- were collected. An estimated 53.2 ± 11.0 of these events were expected to be background. Normalizing to the ?0 Dalitz decay they found Br(?0 → e+e-, (me+e-/m ?0)2 > 0.95) = (6.44 ± 0.25(stat) ± 0.22(syst)) x 10-8 where internal radiation, ?0 → e+e-(?), was limited by the requirement (me+e-/m?0)2 > 0.95 which separated it from the tree level Dalitz decay, ?0 → e+e-?.
Measurements on the Rare Decay [pi]0 --> Ee−
Title | Measurements on the Rare Decay [pi]0 --> Ee− PDF eBook |
Author | Willem van Doesburg |
Publisher | |
Pages | 97 |
Release | 1981 |
Genre | Pions |
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A Measurement of the Branching Ratio of the [pi]0 Dalitz Decay Using K[subscript]L [arrow] 3[pi]0 Decays from KTeV
Title | A Measurement of the Branching Ratio of the [pi]0 Dalitz Decay Using K[subscript]L [arrow] 3[pi]0 Decays from KTeV PDF eBook |
Author | Erin E. Abouzaid |
Publisher | |
Pages | 328 |
Release | 2007 |
Genre | Kaons |
ISBN |
Prospects for Measuring the Branching Ratio of the Rare B_1hn0_1tns->_m63_1hn+_m63_1hn- [B_1hn0_1tns->my_1hn+my_1hn-] Decay with the ATLAS Experiment
Title | Prospects for Measuring the Branching Ratio of the Rare B_1hn0_1tns->_m63_1hn+_m63_1hn- [B_1hn0_1tns->my_1hn+my_1hn-] Decay with the ATLAS Experiment PDF eBook |
Author | Valentin Sipica |
Publisher | |
Pages | 156 |
Release | 2011 |
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Search for the Decay D0 -] [gamma][gamma] and Measurement of the Decay D0 -] [pi]0 [pi]0
Title | Search for the Decay D0 -] [gamma][gamma] and Measurement of the Decay D0 -] [pi]0 [pi]0 PDF eBook |
Author | James Paul Morris |
Publisher | |
Pages | 153 |
Release | 2009 |
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Abstract: The Standard Model is the best current description of fundamental interactions and particles; however, the Standard Model has certain shortcomings which have driven particle physicists for the last 30 years to search for phenomena which provide evidence for the next theory beyond the Standard Model. To this end, using the BaBar detector, we search for evidence of the rare decay D* -> D0[pi];D0->[gamma][gamma]. The branching fraction of this decay is enhanced up to 200 times the standard model prediction in certain beyond-the-Standard-Model theories. A measurement of a significant branching fraction would provide evidence for a new theory of particle physics. We describe our search for this rare decay and an improved measurement of the associated decay, B(D0-> [pi]0 [pi]0) using an integrated luminosity corresponding to 470.5 fb−1 of e e− data collected by the BaBar detector at the PEP-II asymmetric ee− collider at SLAC from 1999-2007. We place an upper limit of B(D0->[gamma][gamma]) 2.51 X 10−6 at 90% confidence level and find B(D0-[pi]0[pi]0) = (8.4 " 0.1 " 0.4 " 0.3) X 10−4.
Prospects for Measuring the Branching Ratio of the Rare B 0 S My + My - Decay with the ATLAS Experiment
Title | Prospects for Measuring the Branching Ratio of the Rare B 0 S My + My - Decay with the ATLAS Experiment PDF eBook |
Author | Valentin Sipica |
Publisher | |
Pages | |
Release | 2011 |
Genre | |
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