Measurement Of The B Rightarrow P Barp K Branching Fraction And Study Of The Decay Dynamics PDF Download
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| Total Pages | : 8 |
| Release | : 2005 |
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Download Measurement of the $B^+\rightarrow P \bar{p} K^{+}$ Branching Fraction and Study of the Decay Dynamics Book in PDF, ePub and Kindle
With a sample of 232 x 106 [Upsilon](4S) 2!B{bar B} events collected with the BABAR detector, we study the decay B 2!p{bar p}K excluding charmonium decays to p{bar p}. We measure a branching fraction [Beta](B+ 2!p{bar p}K+) = (6.7 ± 0.5 ± 0.4) x 10−6. An enhancement at low p{bar p} mass is observed and the Dalitz plot asymmetry suggests dominance of the penguin amplitude in this B decay. We search for a pentaquark candidate [Theta]*{sup ++} decaying into pK+ in the mass range 1.43 to 2.00 GeV/c2 and set limits on [Beta](B+ 2![Theta]*{sup ++} {bar p}) x [Beta]([Theta]*{sup ++} 2!pK+) at the 10−7 level.
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| Total Pages | : 5 |
| Release | : 2004 |
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Download MEASUREMENT OF THE BRANCHING FRACTIONS FOR THE DECAYS B°--]D*− P{bar P}?, B°--]D−p{bar P}?+, B0--]D*° P{bar P} AND B°--]D° P{bar P} Book in PDF, ePub and Kindle
The B° meson decay modes B° --> D*−p{bar p}?, D−p{bar p}+, {bar D}*°p{bar p}, and B° --> {bar D}°p{bar p} are studied in a sample of 124 x 106 B{bar B} pairs collected with the BABAR detector at the PEP-II collider. The decay of B° --> D−p{bar p}?+ is observed for the first time, with a measured branching fraction B(B° --> D−p{bar p}?+) = (3.80 ± 0.35 ± 0.46) x 10−4. The following branching fractions are also determined: B(B° --> D*−p{bar p}?+) = (5.61 ± 0.59 ± 0.73) x 10−4, B(B° --> {bar D}*° p{bar p}) = (0.67 ± 0.21 ± 0.09) x 10−4, and B(B° --> {bar D}°p{bar p}) = (1.24 ± 0.14 ± 0.12) x 10−4. In each decay mode the invariant mass spectra of the charmed mesons and the baryons are compared with a pure phase-space hypothesis in order to gain insight into the B meson decay dynamics. In particular, the Dalitz plots of {bar D}*°p versus {bar D}*°{bar p} for B° --> {bar D}*°p{bar p} and of {bar D}°p versus {bar D}°{bar p} for B° --> {bar D}°p{bar p} are presented. All results are preliminary.
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| Release | : 2004 |
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Download MEASUREMENT OF THE BRANCHING FRACTIONS FOR THE DECAYS B[sup 0]--]D*[sup -] P[bar P][pi][sup +], B[sup 0]--]D[sup -]p[bar P][pi][sup +], B0--]D*[sup 0] P[bar P] AND B[sup 0]--]D[sup 0] P[bar P]. Book in PDF, ePub and Kindle
The B[sup 0] meson decay modes B[sup 0] --> D*[sup -]p[bar p][pi][sup +], D[sup -]p[bar p][sup +], [bar D]*[sup 0]p[bar p], and B[sup 0] --> [bar D][sup 0]p[bar p] are studied in a sample of 124 x 10[sup 6] B[bar B] pairs collected with the BABAR detector at the PEP-II collider. The decay of B[sup 0] --> D[sup -]p[bar p][pi][sup +] is observed for the first time, with a measured branching fraction B(B[sup 0] --> D[sup -]p[bar p][pi][sup +]) = (3.80 [+-] 0.35 [+-] 0.46) x 10[sup -4]. The following branching fractions are also determined: B(B[sup 0] --> D*[sup -]p[bar p][pi][sup +]) = (5.61 [+-] 0.59 [+-] 0.73) x 10[sup -4], B(B[sup 0] --> [bar D]*[sup 0] p[bar p]) = (0.67 [+-] 0.21 [+-] 0.09) x 10[sup -4], and B(B[sup 0] --> [bar D][sup 0]p[bar p]) = (1.24 [+-] 0.14 [+-] 0.12) x 10[sup -4]. In each decay mode the invariant mass spectra of the charmed mesons and the baryons are compared with a pure phase-space hypothesis in order to gain insight into the B meson decay dynamics. In particular, the Dalitz plots of [bar D]*[sup 0]p versus [bar D]*[sup 0][bar p] for B[sup 0] --> [bar D]*[sup 0]p[bar p] and of [bar D][sup 0]p versus [bar D][sup 0][bar p] for B[sup 0] --> [bar D][sup 0]p[bar p] are presented. All results are preliminary.
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| Release | : 2003 |
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Download Measurement of the Branching Fraction and Polarization for the Decay B[sup -][yields] D*[sup 0] K*[sup -]. Book in PDF, ePub and Kindle
The authors present a study of the decay B[sup -][yields] D*[sup 0] K*[sup -] based on a sample of 86 million[Upsilon](4S)[yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factor at SLAC. The authors measure the branching fraction[Beta](B[sup -][yields] D*[sup 0] K*[sup -])= (8.3[+-] 1.1(stat)[+-] 1.0(syst)) x 10[sup -4], and the fraction of longitudinal polarization in this decay to be[Lambda][sub L]/[Lambda]= 0.86[+-] 0.06(stat)[+-] 0.03(syst).
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| Total Pages | : 5 |
| Release | : 2003 |
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Download Measurement of the Branching Fraction of B{bar B} → K{sub S}°X Decay at the BABAR Experiment Book in PDF, ePub and Kindle
This thesis presents various studies of K{sub s}° mesons carried out at the BABAR experiment. Studying multiplicities of K{sub s}° in B{bar B} decays provides deeper knowledge of the detector performance and produces an important physical result. The branching fraction of B{bar B} → K{sub s}°X decay is measured using 286 pb−1 of data collected during the first year of physics running. The result obtained is BR(B{bar B} → XK{sub s}° →??−) = 0.216 ± 0.003(stat.) ± 0.015(syst.). Implications of this result to the presence of the new physics at TeV scale are discussed. The momentum spectrum of K{sub s}° coming from B{bar B} → XK{sub s}° →?+?− is also presented.
| Author | : M. Bondioli |
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| Release | : 2006 |
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Download Measurement of the B0 -] Lambda-bar P Pi Branching Fraction AndStudy of the Decay Dynamics Book in PDF, ePub and Kindle
We present a measurement of the B{sup 0} {center_dot} {bar {Lambda}}p{pi}{sup -} branching fraction performed using the BABAR detector at the PEP-II asymmetric energy e{sup +}e{sup -} collider. Based on a 232 million B{bar B} pairs data sample we measure: {center_dot} (B{sup 0} {center_dot} {bar {Lambda}}p{pi}{sup -}) = [3.30 {center_dot} 0.53(stat.) {center_dot} 0.31 (syst.)] {center_dot} 10{sup -6}. A measurement of the differential spectrum as a function of the di-baryon invariant mass m({Lambda}p) is also presented; this shows a near-threshold enhancement similar to that observed in other baryonic B decays.
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| Total Pages | : 7 |
| Release | : 2004 |
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Download Measurement of the Branching Fraction for B- --] D0 K*- Book in PDF, ePub and Kindle
The authors present a measurement of the branching fraction for the decay B− → D°K*− using a sample of approximately 86 million B{bar B} pairs collected by the BABAR detector from ee− collisions near the?(4S) resonance. The D° is detected through its decays to K−?+, K−?+?° and K−?+?−?+, and the K*− through its decay to K{sub S}°?−. They measure the branching fraction to be?(B− → D°K*−) = (6.3 ± 0.7(stat.) ± 0.5(syst.)) x 10−4.
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| Total Pages | : 7 |
| Release | : 2003 |
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Download Measurement of the Branching Fraction and Polarization for the Decay B− 2!D*° K*− Book in PDF, ePub and Kindle
The authors present a study of the decay B− → D*° K*− based on a sample of 86 million [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factor at SLAC. The authors measure the branching fraction [Beta](B− → D*° K*−) = (8.3 ± 1.1(stat) ± 1.0(syst)) x 10−4, and the fraction of longitudinal polarization in this decay to be [Lambda]{sub L}/[Lambda] = 0.86 ± 0.06(stat) ± 0.03(syst).
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| Release | : 2003 |
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Download Measurement of the Branching Fraction of B[bar B][yields] K[sub S][sup 0]X Decay at the BABAR Experiment Book in PDF, ePub and Kindle
This thesis presents various studies of K[sub s][sup 0] mesons carried out at the BABAR experiment. Studying multiplicities of K[sub s][sup 0] in B[bar B] decays provides deeper knowledge of the detector performance and produces an important physical result. The branching fraction of B[bar B][yields] K[sub s][sup 0]X decay is measured using 286 pb[sup -1] of data collected during the first year of physics running. The result obtained is BR(B[bar B][yields] XK[sub s][sup 0][yields][pi][sup+][pi][sup -])= 0.216[+-] 0.003(stat.)[+-] 0.015(syst.). Implications of this result to the presence of the new physics at TeV scale are discussed. The momentum spectrum of K[sub s][sup 0] coming from B[bar B][yields] XK[sub s][sup 0][yields][pi][sup+][pi][sup -] is also presented.
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| Total Pages | : 7 |
| Release | : 2004 |
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Download Study of the B- --] J/psi K- Pi+ Pi- Decay and Measurement of the B- --] X(3872) K- Branching Fraction Book in PDF, ePub and Kindle
The authors study the decay B− → J/?K−??− using 117 million B{bar B} events collected at the?(4S) resonance with the BaBar detector at the PEP-II e+e− asymmetric-energy storage ring. They measure the branching fractions?(B− → J/?K−?+?−) = (116 ± 7(stat.) ± 9(syst.)) x 10−5 and?(B− → X(3872)K−) x?(X(3872) → J/??+?−) = (1.28 ± 0.41) x 10−5 and find the mass of the X(3872) to be 3873.4 ± 1.4MeV/c2. They search for the h{sub c} narrow state in the decay B− → h{sub c} K−, h{sub c} → J/??+?− and for the decay B− → J/?D°?−, with D° → K−?+. They set the 90% C.L. limits?(B− → h{sub c}K−) x?(h{sub c} → J/??+?−)
