Author: Mousumi Datta
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
Book Description
A Search for the Rare Leptonic B Decay B to Tau Nu Recoiling Against B to Dstar-zero 1 Nu
A Search for B+ --] Tau+ Nu Tau Recoiling Against B- --] D0 L- Nu-bar L X.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present a search for the decay B[sup+][yields][tau][sup+][nu][sub[tau]] in 88.9 x 10[sup 6][Upsilon](4S) decays recorded with the BABAR detector at the SLAC B-Factory. A sample of semi-exclusive, semi-leptonic B decays (B[sup -][yields] D[sup 0][ell][sup -][bar[nu]][sub[ell]]X), where X is either a photon, [pi][sup 0], or nothing, is used to identify the daughter particles that are associated with the other B meson in each event. These particles are searched for evidence of a one-prong leptonic B[sup+][yields][tau][sup+][nu][sub[tau]] decay. For this data sample we set a preliminary upper limit on the branching fraction of[Beta](B[sup+][yields][tau][sup+][nu][sub[tau]])
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present a search for the decay B[sup+][yields][tau][sup+][nu][sub[tau]] in 88.9 x 10[sup 6][Upsilon](4S) decays recorded with the BABAR detector at the SLAC B-Factory. A sample of semi-exclusive, semi-leptonic B decays (B[sup -][yields] D[sup 0][ell][sup -][bar[nu]][sub[ell]]X), where X is either a photon, [pi][sup 0], or nothing, is used to identify the daughter particles that are associated with the other B meson in each event. These particles are searched for evidence of a one-prong leptonic B[sup+][yields][tau][sup+][nu][sub[tau]] decay. For this data sample we set a preliminary upper limit on the branching fraction of[Beta](B[sup+][yields][tau][sup+][nu][sub[tau]])
A Search for B+ --] Tau + Nu Tau Recoiling Against B- --] D0 L- Nu-bar L X.
Author: Stephen J. Sekula
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
We present a search for the decay B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}} in 88.9 x 10{sup 6} {Upsilon}(4S) decays recorded with the BABAR detector at the SLAC B-Factory. A sample of semi-exclusive, semi-leptonic B decays (B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}X), where X is either a photon, {pi}{sup 0}, or nothing, is used to identify the daughter particles that are associated with the other B meson in each event. These particles are searched for evidence of a one-prong leptonic B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}} decay. For this data sample we set a preliminary upper limit on the branching fraction of {Beta}(B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}})
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
We present a search for the decay B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}} in 88.9 x 10{sup 6} {Upsilon}(4S) decays recorded with the BABAR detector at the SLAC B-Factory. A sample of semi-exclusive, semi-leptonic B decays (B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}X), where X is either a photon, {pi}{sup 0}, or nothing, is used to identify the daughter particles that are associated with the other B meson in each event. These particles are searched for evidence of a one-prong leptonic B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}} decay. For this data sample we set a preliminary upper limit on the branching fraction of {Beta}(B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}})
Search for the Decay Tau - to Nu Tau Eta Pi-
Search for the Rare Leptonic Decay B- -] Tau- Nubar
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present a search for the decay B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] in a sample of 88.9 x 10[sup 6] B[bar B]pairs recorded with the BABAR detector at the SLAC B-Factory. One of the two B mesons from the [Upsilon](4S) is reconstructed in a hadronic or a semileptonic final state and the decay products of the other B in the event are analyzed for consistency with a B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] decay. We find no evidence of a signal and set an upper limit on the branching fraction of [Beta](B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]])
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present a search for the decay B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] in a sample of 88.9 x 10[sup 6] B[bar B]pairs recorded with the BABAR detector at the SLAC B-Factory. One of the two B mesons from the [Upsilon](4S) is reconstructed in a hadronic or a semileptonic final state and the decay products of the other B in the event are analyzed for consistency with a B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] decay. We find no evidence of a signal and set an upper limit on the branching fraction of [Beta](B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]])
A Search for the Rare Decay B-]tau+tau- at the BaBar Experiment
Author: Christopher Thomas Potter
Publisher:
ISBN:
Category :
Languages : en
Pages : 223
Book Description
The Standard Model of particle physics predicts that the branching ratio for the rare decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} is 3.1 x 10{sup -8}, though untested models which could supersede it predict large enhancements. This dissertation describes the search for this rare decay in 210.4 fb{sup -1} of B{sup 0}{bar B}{sup 0} data collected at the {Upsilon}(4S) resonance in the Babar detector at the Stanford Linear Accelerator Center. In the analysis, one neutral B meson is fully reconstructed in a hadronic mode and recoil events which are consistent with each tau decaying in a mode {tau} {yields} {pi}{nu}, {rho}{nu}, or l{nu}{bar {nu}} are selected. There is no evidence for signal. The result is consistent with a downward fluctuation by 1.1 statistical standard deviations of the expected Standard Model background. Taking the expected background, the number of observed events and the expected statistical and systematic errors into account yields 2.7 x 10{sup -3} as the upper limit for B{sup 0} {yields} {tau}{sup +}{tau}{sup -} at the 90% confidence level.
Publisher:
ISBN:
Category :
Languages : en
Pages : 223
Book Description
The Standard Model of particle physics predicts that the branching ratio for the rare decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} is 3.1 x 10{sup -8}, though untested models which could supersede it predict large enhancements. This dissertation describes the search for this rare decay in 210.4 fb{sup -1} of B{sup 0}{bar B}{sup 0} data collected at the {Upsilon}(4S) resonance in the Babar detector at the Stanford Linear Accelerator Center. In the analysis, one neutral B meson is fully reconstructed in a hadronic mode and recoil events which are consistent with each tau decaying in a mode {tau} {yields} {pi}{nu}, {rho}{nu}, or l{nu}{bar {nu}} are selected. There is no evidence for signal. The result is consistent with a downward fluctuation by 1.1 statistical standard deviations of the expected Standard Model background. Taking the expected background, the number of observed events and the expected statistical and systematic errors into account yields 2.7 x 10{sup -3} as the upper limit for B{sup 0} {yields} {tau}{sup +}{tau}{sup -} at the 90% confidence level.
A Search for the Decay B+ ---] Tau+ Nu/Tau at BaBar
Author: M. Datta
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
Book Description
Based on an 87-fb{sup -1} dataset collected by the Babar detector at the PEP-II asymmetric-energy B-Factory, a search for D{sup 0}-{bar D}{sup 0} mixing has been made using the semileptonic decay modes D*{sup +} {yields} {pi}{sup +}D{sup 0}, D{sup 0} {yields} Ke{nu} (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the D{sup 0} decay time and D*{sup +}-D{sup 0} mass difference ({Delta}M) distributions. The high-statistics sample of unmixed semileptonic D{sup 0} decays is used to model the {Delta}M distribution and time-dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the D{sup 0}. A result consistent with no charm mixing has been obtained, R{sub mix} = 0.0023 {+-} 0.0012 {+-} 0.0004. This corresponds to an upper limit of R{sub mix}
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
Book Description
Based on an 87-fb{sup -1} dataset collected by the Babar detector at the PEP-II asymmetric-energy B-Factory, a search for D{sup 0}-{bar D}{sup 0} mixing has been made using the semileptonic decay modes D*{sup +} {yields} {pi}{sup +}D{sup 0}, D{sup 0} {yields} Ke{nu} (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the D{sup 0} decay time and D*{sup +}-D{sup 0} mass difference ({Delta}M) distributions. The high-statistics sample of unmixed semileptonic D{sup 0} decays is used to model the {Delta}M distribution and time-dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the D{sup 0}. A result consistent with no charm mixing has been obtained, R{sub mix} = 0.0023 {+-} 0.0012 {+-} 0.0004. This corresponds to an upper limit of R{sub mix}
Search for the Decay[tau][sup -][yields] 4[pi][sup -]3[pi][sup+]([pi][sup 0][nu][sub[tau].
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We have searched for the decay of the[tau] lepton into seven charged particles and zero or one[pi][sup 0]. The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR) and correspond to an integrated luminosity of 4.61 fb[sup 1]. No evidence for a signal is found. Assuming all the charged particles are pions, we set an upper limit on the branching fraction, B([tau][sup -][yields] 4[pi][sup -]3[pi][sup+]([pi][sup 0])[nu][sub[tau]])
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We have searched for the decay of the[tau] lepton into seven charged particles and zero or one[pi][sup 0]. The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR) and correspond to an integrated luminosity of 4.61 fb[sup 1]. No evidence for a signal is found. Assuming all the charged particles are pions, we set an upper limit on the branching fraction, B([tau][sup -][yields] 4[pi][sup -]3[pi][sup+]([pi][sup 0])[nu][sub[tau]])
A Search for the Decays B+ Arrow] L+nu and B[degree]arrow L+ Tau- (l
Author: Miika A. Klemetti
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"We present searches for the leptonic decays B + [arrow] l+nu and the lepton flavor violating decays B[degree][arrow] l[symbol][tau][symbol], where l = e, [mu], with data collected by the BABAR experiment at SLAC. These searches utilize a technique in which we fully reconstruct the accompanying B̄ in [Upsilon](4S)[arrow] BB̄ events, and look for a monoenergetic lepton in the signal B frame. The signal yield in the data is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378 million BB̄ pairs (342 fb-1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B (B+[arrow] e +[nu])
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"We present searches for the leptonic decays B + [arrow] l+nu and the lepton flavor violating decays B[degree][arrow] l[symbol][tau][symbol], where l = e, [mu], with data collected by the BABAR experiment at SLAC. These searches utilize a technique in which we fully reconstruct the accompanying B̄ in [Upsilon](4S)[arrow] BB̄ events, and look for a monoenergetic lepton in the signal B frame. The signal yield in the data is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378 million BB̄ pairs (342 fb-1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B (B+[arrow] e +[nu])
A Search for B[sup +] --] [tau][sup +][nu][sub [tau] Recoiling Against B[sup -] --] D*[sup 0][ell][sup -][bar [nu][sub [ell]].
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The authors present a search for the decay B[sup +] --> [tau][sup +][nu][sub [tau]] in 124.1 x 10[sup 6] [Upsilon](4S) decays recorded with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay (B[sup -] --> D*[sup 0][ell][sup -][bar [nu]][sub [ell]]) is selected, and in the recoil a search for B[sup +] --> [tau][sup +][nu][sub [tau]] signal is performed. The [tau] is identified in the following channels: [tau][sup +] --> e[sup +][nu][sub e][bar [nu]][sub [tau]] --> [mu][sup +][nu][sub [mu]][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][pi][sup 0][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][pi][sup -][pi][sup +][bar [nu]][sub [tau]]. The authors find no evidence of signal, and they set a preliminary upper limit on the branching fraction of B(B[sup +] --> [tau][sup +][nu][sub [tau]]) 4.3 x 10[sup -4] at the 90% confidence level (CL). This result is then combined with a statistically independent BABAR search for B[sup +] -- [tau][sup +][nu][sub [tau]] to give a combined preliminary limit of B(B[sup +] --> [tau][sup +][nu][sub [tau]])
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The authors present a search for the decay B[sup +] --> [tau][sup +][nu][sub [tau]] in 124.1 x 10[sup 6] [Upsilon](4S) decays recorded with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay (B[sup -] --> D*[sup 0][ell][sup -][bar [nu]][sub [ell]]) is selected, and in the recoil a search for B[sup +] --> [tau][sup +][nu][sub [tau]] signal is performed. The [tau] is identified in the following channels: [tau][sup +] --> e[sup +][nu][sub e][bar [nu]][sub [tau]] --> [mu][sup +][nu][sub [mu]][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][pi][sup 0][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][pi][sup -][pi][sup +][bar [nu]][sub [tau]]. The authors find no evidence of signal, and they set a preliminary upper limit on the branching fraction of B(B[sup +] --> [tau][sup +][nu][sub [tau]]) 4.3 x 10[sup -4] at the 90% confidence level (CL). This result is then combined with a statistically independent BABAR search for B[sup +] -- [tau][sup +][nu][sub [tau]] to give a combined preliminary limit of B(B[sup +] --> [tau][sup +][nu][sub [tau]])