Measurement of the B0 Meson Lifetime with Partial Reconstruction of B0-]D*-pi+ and B0-]D*-rho+ Decays PDF Download
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![Measurement of the B0 Meson Lifetime with Partial Reconstruction of B0-]D*-pi+ and B0-]D*-rho+ Decays PDF](https://books.google.com/books/content/images/frontcover/QtPajwEACAAJ?fife=w150-h200)
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The neutral B meson lifetime is measured with the data collected by the BABAR detector at the PEP-II storage ring during the years 1999 and 2000, with a total integrated luminosity of 20.7 fb[sup -1]. The decays B[sup 0][yields] D*[sup -][pi][sup+] and B[sup 0][yields] D*[sup -][rho][sup+] are selected with a partial-reconstruction technique, yielding samples of 6970[+-] 240 and 5520[+-] 250 signal events, respectively. With these events, the B[sup 0] lifetime is measured to be 1.533[+-] 0.034 (stat.)[+-] 0.038 (syst.) ps. This measurement serves as a test and validation of procedures required to measure the CP violation parameter sin (2[beta]+[gamma]) with partial reconstruction of these modes.
![Measurement of the B0 Meson Lifetime with Partial Reconstruction of B0-]D*-pi+ and B0-]D*-rho+ Decays PDF](https://books.google.com/books/content/images/frontcover/QtPajwEACAAJ?fife=w80-h100)
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The neutral B meson lifetime is measured with the data collected by the BABAR detector at the PEP-II storage ring during the years 1999 and 2000, with a total integrated luminosity of 20.7 fb[sup -1]. The decays B[sup 0][yields] D*[sup -][pi][sup+] and B[sup 0][yields] D*[sup -][rho][sup+] are selected with a partial-reconstruction technique, yielding samples of 6970[+-] 240 and 5520[+-] 250 signal events, respectively. With these events, the B[sup 0] lifetime is measured to be 1.533[+-] 0.034 (stat.)[+-] 0.038 (syst.) ps. This measurement serves as a test and validation of procedures required to measure the CP violation parameter sin (2[beta]+[gamma]) with partial reconstruction of these modes.
![A Measurement of the Neutral B Meson Lifetime Using Partially Reconstructed B0 -] D*-pi+ Decays PDF](https://books.google.com/books/content/images/frontcover/dLvVjwEACAAJ?fife=w80-h100)
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The neutral B meson lifetime has been measured with the data collected by the BABAR detector at the PEP-II storage ring during the year 2000 for a total integrated luminosity of 20.3 fb[sup -1]. The B[sup 0][yields] D*[sup -][pi][sup+] decays have been selected with a partial reconstruction method in which only the fast pion from the B[sup 0] decay and the slow pion from D*[sup -][yields][bar D][sup 0][pi][sup -] are reconstructed. The B[sup 0] lifetime has been measured to be 1.510[+-] 0.040[+-] 0.038 ps with a sample of 6971[+-] 241 reconstructed signal events.
![MEASUREMENT OF THE B[sup 0] LIFETIME USING PARTIAL RECONSTRUCTION. PDF](https://books.google.com/books/content/images/frontcover/NIILkAEACAAJ?fife=w80-h100)
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We present here the first measurement of the B[sup 0] lifetime using partial reconstruction in B[sup 0] [yields] D*[sup -] [rho][sup +] decay. A sample of approximately 5500 B[sup 0] [yields] D*[sup -] [rho][sup +] events were identified among 22.7 million B[bar B] pairs collected by the BABAR experiment during the years 1999-2000. With this data, the B[sup 0] lifetime is measured to be 1.616 [+-] 0.064 [+-] 0.075 ps, in good agreement with the world average. This measurement demonstrates that is it possible to use this technique to perform time-dependent B[sup 0] decay analysis that is central to the measurement of the charge-parity (CP) asymmetries. Investigation of CP observables through measurements of the decays of B[sup 0] mesons is the primary goal of the BABAR experiment at the PEP-II storage ring located at Stanford Linear Accelerator Center (SLAC). As the B[sup 0] particle decays to final states that are directly sensitive to the CP parameter [gamma] are highly suppressed, a promising alternative approach is to use the final state B[sup 0] [yields] D*h. Using the partial event reconstruction analysis method it is possible to compensate for the small CP asymmetries in this decay.
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The two B[sup 0] decay processes B[sup 0][yields] D*[sup -][pi][sup+] and B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] have been studied by means of a partial reconstruction technique using a data sample collected with the BABAR detector at the PEP-II storage ring. To increase statistics, only the soft[pi][sup -] from the decay D*[sup -][yields][pi][sup -] D[sup 0] was used in association with either an oppositely-charged high-momentum pion or lepton. Events were then identified by exploiting the constraints from the simple kinematics of[Upsilon](4S) decays. A clear signature is obtained in each case. The position of the B[sup 0] decay point was obtained from the reconstructed[pi][sup+] ([ell][sup+])[pi][sup -] vertex. The position of the other[bar B][sup 0] in the event was also determined. Taking advantage of the boost given to the[Upsilon](4S) system by the asymmetric beam energies of PEP-II, the lifetime of the B[sup 0] meson has been measured from the separation distance between the two vertices along the beam direction.
![Measurement of the B0 Lifetime with Partial Reconstruction of B0-]D*rho PDF](https://books.google.com/books/content/images/frontcover/JOn3wQEACAAJ?fife=w80-h100)
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Pages : 5
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A sample of about 5500 {bar B}° → D*?− and 700 {bar B}° → D*+a1− events is identified, using the technique of partial reconstruction, among 22.7 million B{bar B} pairs collected by the BABAR experiment at the PEP-II storage ring. With these events, the B° lifetime is measured to be 1.616 ± 0.064 ± 0.075 ps. As the first time-dependent analysis conducted with partial reconstruction of {bar B}° → D*+?−, this measurement serves as validation for the procedures required to measure sin(2? +?) with this technique.
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Languages : en
Pages : 242
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We present here the first measurement of the B° lifetime using partial reconstruction in B° → D*−? decay. A sample of approximately 5500 B° → D*−?+ events were identified among 22.7 million B{bar B} pairs collected by the BABAR experiment during the years 1999-2000. With this data, the B° lifetime is measured to be 1.616 ± 0.064 ± 0.075 ps, in good agreement with the world average. This measurement demonstrates that is it possible to use this technique to perform time-dependent B° decay analysis that is central to the measurement of the charge-parity (CP) asymmetries. Investigation of CP observables through measurements of the decays of B° mesons is the primary goal of the BABAR experiment at the PEP-II storage ring located at Stanford Linear Accelerator Center (SLAC). As the B° particle decays to final states that are directly sensitive to the CP parameter? are highly suppressed, a promising alternative approach is to use the final state B° → D*h. Using the partial event reconstruction analysis method it is possible to compensate for the small CP asymmetries in this decay.
Author: M. Krishnamurthy
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Languages : en
Pages : 242
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We present here the first measurement of the B{sup 0} lifetime using partial reconstruction in B{sup 0} {yields} D*{sup -} {rho}{sup +} decay. A sample of approximately 5500 B{sup 0} {yields} D*{sup -} {rho}{sup +} events were identified among 22.7 million B{bar B} pairs collected by the BABAR experiment during the years 1999-2000. With this data, the B{sup 0} lifetime is measured to be 1.616 {+-} 0.064 {+-} 0.075 ps, in good agreement with the world average. This measurement demonstrates that is it possible to use this technique to perform time-dependent B{sup 0} decay analysis that is central to the measurement of the charge-parity (CP) asymmetries. Investigation of CP observables through measurements of the decays of B{sup 0} mesons is the primary goal of the BABAR experiment at the PEP-II storage ring located at Stanford Linear Accelerator Center (SLAC). As the B{sup 0} particle decays to final states that are directly sensitive to the CP parameter {gamma} are highly suppressed, a promising alternative approach is to use the final state B{sup 0} {yields} D*h. Using the partial event reconstruction analysis method it is possible to compensate for the small CP asymmetries in this decay.
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We have measured the lifetime of an ensemble of particles containing b quarks, tagged with a high p/sub T/ lepton from their semileptonic decay. Using a method which estimates the production point of each particle in the beam ellipse, we measured a lifetime of 0.98 +- 0.12 +- 0.13 psec. We have also studied methods of partially reconstructing B mesons decaying into D/sup/star//minus// mesons plus charged leptons or mesons. We have searched the Mark II PEP data samples and find five candidates for B° decay. Four of these B° candidates form good vertices, and their measured proper lifetimes are presented. 18 refs.
![Measurement of the B0 Lifetime with Partially Reconstructed B0 -] D*- L+ /u Decays PDF](https://books.google.com/books/content/images/frontcover/nlTEjwEACAAJ?fife=w80-h100)
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The B[sup 0] lifetime has been measured with a sample of 23 million B[bar B] pairs collected by the BABAR detector at the PEP-II e[sup+]e[sup -] storage ring during 1999 and 2000. Events from the semileptonic decay B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] have been selected with a partial reconstruction method in which only the charged lepton and the slow[pi] from the D*[sup -][yields][bar D][sup 0][pi][sup -] decay are reconstructed. The result is[tau][sub B][sup 0]= 1.529[+-] 0.012 (stat)[+-] 0.029 (syst) ps.
![Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --] D*- 1+ Nu Decays PDF](https://books.google.com/books/content/images/frontcover/Pw-0DAEACAAJ?fife=w80-h100)
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We measure the B[sup 0] lifetime[tau][sub b[sup 0]] and the B[sup 0]-[bar B][sup 0] oscillation frequency[Delta]m[sub d] with a sample of approximately 14,000 exclusively reconstructed B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] signal events, selected from 23 million B[bar B] pairs recorded at the[Upsilon](4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The decay position of the other B is determined with the remaining tracks in the event, and its b-quark flavor at the time of decay is determined with a tagging algorithm that exploits the correlation between the flavor of the b-quark and the charges of its decay products. The lifetime and oscillation frequency are measured simultaneously with an unbinned maximum-likelihood ([Delta]t) that uses, for each event, the measured difference in decay times of the two B mesons ([Delta]t), the calculated uncertainty on[Delta]t, the signal and background probabilities, and b-quark tagging information for the other B. The results are[tau][sub B[sup 0]]= (1.523[sub -0.023][sup+0.024][+-] 0.022) ps and[Delta]m[sub d]= (0.492[+-] 0.018[+-] 0.013) ps[sup -1].
