› › Measurement Of The B0 Lambda Bar P Pi Branching Fraction Andstudy Of The Decay Dynamics

Measurement of the B0 -] Lambda-bar P Pi Branching Fraction AndStudy of the Decay Dynamics

Author : M. Bondioli

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Page : pages

File Size : 36,85 MB

Release : 2006

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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.



Measurement of the $B^+\rightarrow P \bar{p} K^{+}$ Branching Fraction and Study of the Decay Dynamics

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Page : 8 pages

File Size : 22,29 MB

Release : 2005

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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.



Measurement of the Branching Fraction and Lambda-bar Polarization in B0 -> Lambda-par P Pi-.

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Page : 12 pages

File Size : 29,46 MB

Release : 2009

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We present a measurement of the B° → {bar ?}p?− branching fraction performed using the BABAR detector at the PEP-II asymmetric e+e− collider. Based on a sample of 467 x 106 B{bar B} pairs we measure ?(B° → {bar ?}p?−) [3.07 ± 0.31(stat.) ± 0.23(syst.)] x 10−6. The measured differential spectrum as a function of the dibaryon invariant mass m({bar ?}p) shows a near-threshold enhancement similar to that observed in other baryonic B decays. We study the {bar ?} polarization as a function of {bar ?} energy in the B° rest frame (E*{sub {bar ?}}) and compare it with theoretical expectations of fully longitudinally right-polarized {bar ?} at large E*{sub {bar ?}}.





Measurement of the Branching Fractions of Lambda(C)+--]P Anti-K N(Pi).

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File Size : 32,92 MB

Release : 2003

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Using data recorded by the CLEO-II detector at CESR, we report new measurements of the branching fractions for the decays of the charmed baryon[Lambda][sub c][sup+] into pK[sup -][pi][sup+][pi][sup 0], p[bar K][sup 0], p[bar K][sup 0][pi][sup+][pi][sup -], and p[bar K][sup 0][pi][sup 0], all measured relative to pK[sup -][pi][sup+]. The relative branching fractions are 0.67[+-] 0.04[+-] 0.11, 0.46[+-] 0.02[+-] 0.04, 0.52[+-] 0.04[+-] 0.05, and 0.66[+-] 0.05[+-] 0.07 respectively.



Study of the Decay B0bar -] D* Omega Pi

Author : B. Aubert

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Page : 12 pages

File Size : 33,34 MB

Release : 2006

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We report on a study of the decay {bar B}{sup 0} {yields} D*{sup +}{omega}{pi}{sup -} with the BABAR detector at the PEP-II B-factory at the Stanford Linear Accelerator Center. Based on a sample of 232 million B{bar B} decays, we measure the branching fraction {Beta}({bar B}{sup 0} {yields} D*{sup +}{omega}{pi}{sup -}) = (2.88 {+-} 0.21(stat.) {+-} 0.31(syst.)) x 10{sup -3}. We study the invariant mass spectrum of the {omega}{pi}{sup -} system in this decay. This spectrum is in good agreement with expectations based on factorization and the measured spectrum in {tau}{sup -} {yields} {omega}{pi}{sup -} {nu}{sub {tau}}. We also measure the polarization of the D*{sup +} as a function of the {omega}{pi}{sup -} mass. In the mass region 1.1 to 1.9 GeV we measure the fraction of longitudinal polarization of the D*{sup +} to be {Lambda}{sub L}/{Lambda} = 0.654 {+-} 0.042(stat.) {+-} 0.016(syst.). This is in agreement with the expectations from heavy-quark effective theory and factorization assuming that the decay proceeds as {bar B}{sup 0} {yields} D*{sup +}{rho}(1450), {rho}(1450) {yields} {omega}{pi}{sup -}.



Measurements of the Decays B0-]D0barppbar, B0-]D*0ppbar, B0-]D-ppbar\pi+, and B0-]D*-ppbar\pi

Author : B. Aubert

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Page : 9 pages

File Size : 38,32 MB

Release : 2006

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The authors present measurements of branching fractions of B{sup 0} decays to multi-body final states containing protons, based on 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. They measure the branching fractions {Beta}(B{sup 0} {yields} {bar D}{sup 0} p{bar p}) = (1.13 {+-} 0.06 {+-} 0.08) x 10{sup -4} {Beta}(B{sup 0} {yields} {bar D}*{sup 0} p{bar p}) = (1.01 {+-} 0.10 {+-} 0.09) x 10{sup -4}, {Beta}(B{sup 0} {yields} D{sup -} p{bar p}{pi}{sup +}) = (3.38 {+-} 0.14 {+-} 0.29) x 10{sup -4}, and {Beta}(B{sup 0} {yields} D*{sup -} p{bar p}{pi}{sup +}) = (4.81 {+-} 0.22 {+-} 0.44) x 10{sup -4} where the first error is statistical and the second systematic. They present a search for the charmed pentaquark state, {Theta}{sub c}(3100) observed by H1 and put limits on the branching fraction {Beta}(B{sup 0} {yields} {Theta}{sub c}{bar p}{pi}{sup +}) x {Beta}({Theta}{sub c} {yields} D*{sup -}p)



Measurements of {\cal B}(\overline{B}0̂ \to \Lambda_{c}{̂+} \overline{p}) and {\cal B}(B-̂ \to \Lambda_{c}{̂+} \overline{p} \pi-̂) and Studies of \Lambda_{c}{̂+}\pi-̂ Resonances

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Page : 20 pages

File Size : 22,29 MB

Release : 2008

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The authors present an investigation of the decays {bar B}° →?{sub c}{bar p} and B− →?{sub c}+{bar p}?− based on 383 x 106?(4S) → B{bar B} decays recorded with the BABAR detector. They measure the branching fractions of these decays; their ratio is?(B− →?{sub c}+{bar p}?−)/?({bar B}° →?{sub c}+{bar p}) = 15.4 ± 1.8 ± 0.3. The B− →?{sub c}+{bar p}?− process exhibits an enhancement at the?{sub c}+{bar p} threshold and is a laboratory for searches for excited charm baryon states. They observe the resonant decays B− →?{sub c}(2455)°{bar p} and B−?{sub c}(2800)°{bar p} but see no evidence for B− →?{sub c}(2520)°{bar p}. This is the first observation of the decay B− →?{sub c}(2800)°{bar p}; however, the mass of the observed excited?{sub c}° state is (2846 ± 8 ± 10) MeV/c2, which is somewhat inconsistent with previous measurements. Finally, they examine the angular distribution of the B− →?{sub c}(2455)°{bar p} decays and measure the spin of the?{sub c}(2455)° baryon to be 1/2, as predicted by the quark model.



Measurement of the Production Fraction Times Branching Fraction $\boldsymbol{ F(b\to\Lambda_{b})\cdot \mathcal{B}(\Lambda_{b}\to J/\psi \Lambda)}$

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Page : pages

File Size : 32,61 MB

Release : 2011

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The [Lambda]{sub b}(udb) baryon is observed in the decay [Lambda]{sub b} → J/[psi][Lambda] using 6.1 fb−1 of p{bar p} collisions collected with the D0 detector at √s = 1.96 TeV. The production fraction multiplied by the branching fraction for this decay relative to that for the decay B° → J/[psi]K{sub s}° is measured to be 0.345 ± 0.034 (stat.) ± 0.033 (syst.) ± 0.003 (PDG). Using the world average value of f(b → B°) · [Beta](B° → J/[psi]K{sub s}°) = (1.74 ± 0.08) x 10−5, they obtain f(b → [Lambda]{sub b}) · [Beta]([Lambda]{sub b} → J/[psi][Lambda]) = (6.01 ± 0.60 (stat.) ± 0.58 (syst.) ± 0.28 (PDG)) x 10−5. This measurement represents an improvement in precision by about a factor of three with respect to the current world average.



Branching Fraction Measurement of B0 to D(*)-pi+and B- to D(*)0pi+ and Isospin Analyses of B to D(*)pi Decays

Author : B. Aubert

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Page : 8 pages

File Size : 14,24 MB

Release : 2006

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Using 65 million {Upsilon}(4S) {yields} B{bar B} events collected with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at the Stanford Linear Accelerator Center, they measure the color-favored branching fractions {Beta}({bar B}{sup 0} {yields} D{sup +}{pi}{sup -}) = (2.63 {+-} 0.05 {+-} 0.22) x 10{sup -3}, {Beta}({bar B}{sup 0} {yields} D*{sup +}{pi}{sup -}) = (2.79 {+-} 0.08 {+-} 0.18) x 10{sup -3}, {Beta}(B{sup -} {yields} D{sup 0}{pi}{sup -}) = (4.90 {+-} 0.07 {+-} 0.23) x 10{sup -3} and {Beta}(B{sup -} {yields} D*{sup 0} {pi}{sup -}) = (5.52 {+-} 0.17 {+-} 0.43) x 10{sup -3}, where the first error is statistical and the second is systematic. With these results and the current world average for the branching fraction for the color-suppressed decay {bar B}{sup 0} {yields} D{sup (*)0}{pi}{sup 0}, the cosines of the strong phase difference {delta} between the I = 1/2 and I = 3/2 isospin amplitudes are determined to be cos{sigma} = 0.860{sub -0.006-0.028}{sup +0.007+0.029} for the {bar B} {yields} D{pi} process and cos{sigma} = 0.917{sub -0.016-0.051}{sup +0.018+0.059} for the {bar B} {yields} D*{pi} process. The results for cos{delta} suggest that final-state interactions are presented in the D{pi} system.