Author: Valeri Nikolaevich Jejer
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
Book Description
Search for the Decay of the Long-lived Neutral Kaon Into an Electron-positron Pair in the KTeV Experiment
Author: Valeri Nikolaevich Jejer
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
Book Description
A Search for the Decay of the Long-lived Neutral Kaon Into an Electron and a Positron
Author: John William Belz
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 374
Book Description
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 374
Book Description
First observation of the decay of the long-lived neutral kaon into an electron and a positron
Author: Vassilios Ioannis Vassilakopoulos
Publisher:
ISBN:
Category : Kaons
Languages : en
Pages : 608
Book Description
Publisher:
ISBN:
Category : Kaons
Languages : en
Pages : 608
Book Description
Experimental Search for the Rare Decay of the Long-lived Neutral Kaon to a Muon and an Electron
Author: David Laurence Wagner
Publisher:
ISBN:
Category :
Languages : en
Pages : 318
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 318
Book Description
Search for the Decay [long Lived Neutral Kaon to Muon and Electron]
CERN Courier
Author: European Organization for Nuclear Research
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 336
Book Description
This journal is devoted to the latest research on physics, publishing articles on everything from elementary particle behavior to black holes and the history of the universe.
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 336
Book Description
This journal is devoted to the latest research on physics, publishing articles on everything from elementary particle behavior to black holes and the history of the universe.
A Search for the Decay of a B Meson Into a Kaon and a Tau Lepton Pair at the BaBar Experiment
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 235
Book Description
The flavour changing neutral current (FCNC) process, $B^+$ → $K^+ [tau]^+ [tau]^-$ highly suppressed in the Standard Model (SM). This decay is forbidden at tree level and only occurs at lowest order via one-loop diagrams.$B^+$ → $K^+ [tau]^+ [tau]^-$ thus has the potential to provide a stringent test of the SM and a fertile ground for new physics searches. Contributions due to virtual particles in the loop allow one to probe, at relatively low energies, new physics at large mass scales. We search for the rare FCNC process $B^+$ → $K^+ [tau]^+ [tau]^-$ using data collected by the BaBaR detector at the SLAC National Accelerator Laboratory. The BaBaR data sample corresponds to a total integrated luminosity, at the energy of the [Tau](4S) resonance, of 424.4 $fb^-1$ and 471 million $B\bar{B}$ pairs. For this search, hadronic $B_{tag}$ reconstruction is employed, where one B is exclusively reconstructed via one of many possible hadronic modes. The remaining decay products in an event are then attributed to the signal B, on which the search for $B^+$ → $K^+ [tau]^+ [tau]^-$ is performed. Each [tau] is required to decay leptonically, into either an electron or a muon and the lepton neutrinos. Furthermore, a multi-variate analysis technique (neural network) is used to select for signal events and suppress dominant background modes. No significant signal is observed. The resulting branching fraction is measured to be $\beta(B^+$ → $K^+ [tau]^+)$ = $1.31^{0:66}_{-0:61}$(stat.) $^{+0:35}_{-0:25}$(sys.) x 10$^{-3}$, which is consistent with zero at the 1.9[sigma] level, with an upper limit of 2.25 x 10$^{-3}$, at the 90% confidence level.
Publisher:
ISBN:
Category :
Languages : en
Pages : 235
Book Description
The flavour changing neutral current (FCNC) process, $B^+$ → $K^+ [tau]^+ [tau]^-$ highly suppressed in the Standard Model (SM). This decay is forbidden at tree level and only occurs at lowest order via one-loop diagrams.$B^+$ → $K^+ [tau]^+ [tau]^-$ thus has the potential to provide a stringent test of the SM and a fertile ground for new physics searches. Contributions due to virtual particles in the loop allow one to probe, at relatively low energies, new physics at large mass scales. We search for the rare FCNC process $B^+$ → $K^+ [tau]^+ [tau]^-$ using data collected by the BaBaR detector at the SLAC National Accelerator Laboratory. The BaBaR data sample corresponds to a total integrated luminosity, at the energy of the [Tau](4S) resonance, of 424.4 $fb^-1$ and 471 million $B\bar{B}$ pairs. For this search, hadronic $B_{tag}$ reconstruction is employed, where one B is exclusively reconstructed via one of many possible hadronic modes. The remaining decay products in an event are then attributed to the signal B, on which the search for $B^+$ → $K^+ [tau]^+ [tau]^-$ is performed. Each [tau] is required to decay leptonically, into either an electron or a muon and the lepton neutrinos. Furthermore, a multi-variate analysis technique (neural network) is used to select for signal events and suppress dominant background modes. No significant signal is observed. The resulting branching fraction is measured to be $\beta(B^+$ → $K^+ [tau]^+)$ = $1.31^{0:66}_{-0:61}$(stat.) $^{+0:35}_{-0:25}$(sys.) x 10$^{-3}$, which is consistent with zero at the 1.9[sigma] level, with an upper limit of 2.25 x 10$^{-3}$, at the 90% confidence level.
Search for the Rare Decay Neutral Kaon(long) Going to Neutral Pion-neutrino-antineutrino
Author: Jiasen Ma
Publisher:
ISBN: 9781109313574
Category :
Languages : en
Pages : 82
Book Description
A search for K0L & rarr; pi0nunu was performed on data taken during the last Run of the E391a experiment at KEK. Blind analysis approach was adopted. The acceptance for the signal was improved from previous analysis by about 40% because of a better understanding of the background. With (3.48 +/- 0.25) * 109 K0L decays, we found no candidate events. An upper limit of 6.96 x 10-8 on the K0L & rarr; pi0nunu branching ratio was set at the 90% confidence level.
Publisher:
ISBN: 9781109313574
Category :
Languages : en
Pages : 82
Book Description
A search for K0L & rarr; pi0nunu was performed on data taken during the last Run of the E391a experiment at KEK. Blind analysis approach was adopted. The acceptance for the signal was improved from previous analysis by about 40% because of a better understanding of the background. With (3.48 +/- 0.25) * 109 K0L decays, we found no candidate events. An upper limit of 6.96 x 10-8 on the K0L & rarr; pi0nunu branching ratio was set at the 90% confidence level.
A Measurement of the Rate at which the Long-lived Neutral Kaon Decays to Two Muons
An Experimental Study of the 2 Neutral-pion Decay of the Long-lived Neutral K-meson
Author: Paul C. Wheeler
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
Book Description
The 2 neutral-pion CP-violating decay of the neutral-K2-meson was studied in a recent experiment at the Princeton-Pennsylvania Accelerator. The energy spectrum of generated gamma-rays was obtained for the center-of-mass system of the neutral-K2 and used to measure the branching ratio (neutral-K2 to 2 neutral-pions)/(neutral-K2 to all modes). An upper limit of 0.0031 was obtained by normalizing to the neutral-K2 to 3 neutral-pion decay mode. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
Book Description
The 2 neutral-pion CP-violating decay of the neutral-K2-meson was studied in a recent experiment at the Princeton-Pennsylvania Accelerator. The energy spectrum of generated gamma-rays was obtained for the center-of-mass system of the neutral-K2 and used to measure the branching ratio (neutral-K2 to 2 neutral-pions)/(neutral-K2 to all modes). An upper limit of 0.0031 was obtained by normalizing to the neutral-K2 to 3 neutral-pion decay mode. (Author).