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Measurement Of The B0 Meson Lifetime With Partial Reconstruction Of B0 D Pi And B0 D Rho Decays
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Book Synopsis Measurement of the B0 Meson Lifetime with Partial Reconstruction of B0-]D*-pi+ and B0-]D*-rho+ Decays by :
Download or read book Measurement of the B0 Meson Lifetime with Partial Reconstruction of B0-]D*-pi+ and B0-]D*-rho+ Decays written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis A Measurement of the Neutral B Meson Lifetime Using Partially Reconstructed B0 -] D*-pi+ Decays by :
Download or read book A Measurement of the Neutral B Meson Lifetime Using Partially Reconstructed B0 -] D*-pi+ Decays written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis MEASUREMENT OF THE B[sup 0] LIFETIME USING PARTIAL RECONSTRUCTION. by :
Download or read book MEASUREMENT OF THE B[sup 0] LIFETIME USING PARTIAL RECONSTRUCTION. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis A Measurement of B0 Meson Properties Using Partially Reconstructed B0 to D*- Pi+ and B0 Tp D*- Lepton+ Nu-lepton Decays with the BABAR Detector by :
Download or read book A Measurement of B0 Meson Properties Using Partially Reconstructed B0 to D*- Pi+ and B0 Tp D*- Lepton+ Nu-lepton Decays with the BABAR Detector written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of the B0 Lifetime with Partial Reconstruction of B0-]D*rho by :
Download or read book Measurement of the B0 Lifetime with Partial Reconstruction of B0-]D*rho written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis MEASUREMENT OF THE B° LIFETIME USING PARTIAL RECONSTRUCTION. by :
Download or read book MEASUREMENT OF THE B° LIFETIME USING PARTIAL RECONSTRUCTION. written by and published by . This book was released on 2003 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis MEASUREMENT OF THE B{sup 0} LIFETIME USING PARTIAL RECONSTRUCTION. by : M. Krishnamurthy
Download or read book MEASUREMENT OF THE B{sup 0} LIFETIME USING PARTIAL RECONSTRUCTION. written by M. Krishnamurthy and published by . This book was released on 2003 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis B Meson Reconstruction and Lifetime Studies with the Mark II at PEP. by :
Download or read book B Meson Reconstruction and Lifetime Studies with the Mark II at PEP. written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of the B0 Lifetime with Partially Reconstructed B0 -] D*- L+ /u Decays by :
Download or read book Measurement of the B0 Lifetime with Partially Reconstructed B0 -] D*- L+ /u Decays written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --] D*- 1+ Nu Decays by :
Download or read book Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --] D*- 1+ Nu Decays written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].
Book Synopsis Vol. misc. inscr.: Petitionen betr. Getreidezölle 1887. 88 by :
Download or read book Vol. misc. inscr.: Petitionen betr. Getreidezölle 1887. 88 written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --] D*- 1+ Nu Decays by :
Download or read book Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --] D*- 1+ Nu Decays written by and published by . This book was released on 2002 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the B° lifetime [tau]{sub b°} and the B°-{bar B}° oscillation frequency [Delta]m{sub d} with a sample of approximately 14,000 exclusively reconstructed B{sup 0} 2!D*− l [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−1.
Book Synopsis A MEASUREMENT OF THE LIFETIME AND MIXING FREQUENCY OF NEUTRAL B MESONS WITH SEMILEPTONIC DECAYS IN THE BABAR DETECTOR. by :
Download or read book A MEASUREMENT OF THE LIFETIME AND MIXING FREQUENCY OF NEUTRAL B MESONS WITH SEMILEPTONIC DECAYS IN THE BABAR DETECTOR. written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutral B meson, consisting of a b quark and an anti-d quark, can mix (oscillate) to its own anti-particle through second-order weak interactions. The measurement of the mixing frequency can constrain the quark mixing matrix in the Standard Model of particle physics. The PEP-II B-factory at the Stanford Linear Accelerator Center provides a very large data sample that enables us to make measurements with much higher precisions than previous measurements, and to probe physics beyond the Standard Model. The lifetime of the neutral B meson[tau][sub B0] and the B[sup 0]-[bar B][sup 0] mixing frequency[Delta]m[sub d] are measured 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 asymmetric-energy e[sup+]e[sup -] collider, PEP-II. The decay position of the exclusively reconstructed B is determined by the charged tracks in the final state, and its b-quark flavor at the time of decay is known unambiguously from the charge of the lepton. The decay position of the other B is determined inclusively, and its b-quark flavor at the time of decay is determined (tagged) with the charge of tracks in the final state, where identified leptons or kaons give the most information. The decay time difference of two B mesons in the event is calculated from the distance between their decay vertices and the Lorentz boost of the center of mass. Additional samples of approximately 50,000 events are selected for studies of background events. The lifetime and mixing frequency, along with wrong-tag probabilities and the time-difference resolution function, are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in B decay times ([Delta]t), the calculated uncertainty on[Delta]t, the signal and background probabilities, and b-quark tagging for the other B meson. 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], where the first error is statistical and the second is systematic. The statistical correlation coefficient between[tau][sub B[sup 0]] and[Delta]m[sub d] is -0.22. This result is consistent with the current world average values, the total errors are comparable with other most-precise measurements.
Book Synopsis New Measurements from Fully Reconstructed Hadronic Final States of the $B^0_2$ Meson at CDF II Experiment by :
Download or read book New Measurements from Fully Reconstructed Hadronic Final States of the $B^0_2$ Meson at CDF II Experiment written by and published by . This book was released on 2006 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports the reconstruction and lifetime measurement of B+, B$0/atop{d}$ and B$0/atop{s}$ mesons, performed using fully reconstructed hadronic decays collected by a dedicated trigger at CDF II experiment. This dedicated trigger selects significantly displaced tracks from primary vertex of p$\bar{p}$ collisions generated at Tevatron collider, obtaining, in this way, huge data samples enriched of long-lived particles, and is therefore suitable for reconstruction of B meson in hadronic decay modes. Due to the trigger track impact parameter selections, the proper decay time distributions of the B mesons no longer follow a simply exponential decay law. This complicates the lifetime measurement and requires a correct understanding and treatment of all the involved effects to keep systematic uncertainties under control. This thesis presents a method to extract the lifetime of B mesons in "ct- biased" samples, based on a Monte Carlo approach, to correct for the effects of the trigger and analysis selections. We present the results of this method when applied on fully re- constructed decays of B collected by CDF II in the data taking runs up to August 2004, corresponding to an integrated luminosity of about 360 pb-1. The lifetimes are extracted using the decay modes B+ 2!$\bar{D}$0[pi]+, B$0\atop{d}$ 2!D-[pi]+, B$0\atop{d}$ 2!D-[pi]+[pi]-[pi]+, B$0\atop{s}$ 2!D$-\atop{s}$[pi]+ and B$0\atop{s}$ 2!D$-\atop{s}$ [pi]+[pi]-[pi]+(and c.c.) and performing combined mass-lifetime unbinned maximum likelihood fits.
Book Synopsis Measurement of B0 and B+ Lifetimes Using Semileptonic Decays at CDF. by :
Download or read book Measurement of B0 and B+ Lifetimes Using Semileptonic Decays at CDF. written by and published by . This book was released on 2010 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lifetime measurements for B0 and B+ are presented using semileptonic decays of B mesons from 360 pb-1 of data collected by CDF's lepton plus displaced track trigger. The decays B 2!l[nu]DX, where D is either D +, D0, or D* +, are partially reconstructed from a muon or electron, a displaced track, and a fully reconstructed charm meson. The B 0 and B+ lifetimes are obtained from an unbinned maximum-likelihood fit to the proper decay length distributions. The measured lifetimes are [tau]B 0 = 1.527 ± 0.012(stat.) ± 0.023(syst.)ps and [tau]B + = 1.629 ± 0.013(stat.) ± 0.025(syst.)ps.
Book Synopsis A Measurement of the Charged and Neutral B Meson Lifetimes Using Fully Reconstructed Decays by :
Download or read book A Measurement of the Charged and Neutral B Meson Lifetimes Using Fully Reconstructed Decays written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Data collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC are used to study the lifetimes of the B° and B mesons. The data sample consists of 7.4 fb−1 collected near the Upsilon(4S) resonance. B° and B mesons are fully reconstructed in several exclusive hadronic decay modes to charm and charmonium final states. The B lifetimes are determined from the flight length difference between the two B mesons which are pair-produced in the Upsilon(4S) decay. The preliminary measurements of the lifetimes are tau{sub B0} = 1.506 " 0.052 (stat) " 0.029 (syst) ps, tau{sub B+} = 1.602 " 0.049 (stat) " 0.035 (syst) ps, and of their ratio is tau{sub B+}/tau{sub B0} = 1.065 " 0.044 (stat) " 0.021 (syst).
Book Synopsis Measurement of the Branching Fraction of B0 Meson Decay to A_1^+(1260) Pi- by : J. C. Chen
Download or read book Measurement of the Branching Fraction of B0 Meson Decay to A_1^+(1260) Pi- written by J. C. Chen and published by . This book was released on 2005 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a preliminary measurement of the branching fraction of the B meson decay B{sup 0} {yields} a{sub 1}{sup +}(1260){pi}{sup -}with a{sub 1}{sup +}(1260) {yields} {pi}{sup +}{pi}{sup +}{pi}{sup -}. The data sample corresponds to 218 x 10{sup 6} B{bar B} pairs produced in e{sup +}e{sup -} annihilation through the {Upsilon}(4S) resonance. We find the branching fraction (40.2 {+-} 3.9 {+-} 3.9) x 10{sup -6}, where the first error quoted is statistical and the second is systematic. The fitted values of the a{sub 1}(1260) parameters are m{sub a{sub 1}} = 1.22 {+-} 0.02 GeV/c{sup 2} and {Lambda}{sub a{sub 1}} = 0.423 {+-} 0.050 GeV/c{sup 2}.
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