Search results for "annihilation"

showing 10 items of 1016 documents

Evidence for the singly Cabibbo suppressed decayΛc+→pηand search forΛc+→pπ0

2017

We study the singly Cabibbo suppressed decays Lambda(+)(c) -> p eta and Lambda(+)(c) -> p pi(0) using Lambda(+)(c)(Lambda) over bar (-)(c) pairs produced by e(+)e(-) collisions at a center-of-mass energy of root s = 4.6 GeV. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 pb(-1). We find the first evidence for the decay Lambda(+)(c) -> p eta with a statistical significance of 4.2 sigma and measure its branching fraction to be B(Lambda(+)(c) -> p eta) = (1.24 +/- 0.28(stat) +/- 0.10(sys)) x 10(-3). No significant Lambda(+)(c) -> p pi(0) signal is observed. We set an upper limit on its branching fraction B(Lambda(+…

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationAnalytical chemistryLambda01 natural sciencesLuminosityCharmed baryons0103 physical sciencesPiHigh Energy Physics::Experiment010306 general physicsBar (unit)Physical Review D
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Observation of e+e−→ϕχc1 and ϕχc2 at s=4.600  GeV

2018

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of root s = 4.600 GeV, we search for the production of e(+)e(-) -> phi chi( ...

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationDetectorRoot (chord)01 natural sciencesNuclear physics0103 physical sciencesHigh Energy Physics::ExperimentBorn approximation010306 general physicsEnergy (signal processing)Storage ringPhysical Review D
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Observation ofB+→K¯0K+andB0→K0K¯0

2006

The authors report observations of the b {yields} d penguin-dominated decays B{sup +} {yields} {bar K}{sup 0}K{sup +} and B{sup 0} {yields} K{sup 0}{bar K}{sup 0} in approximately 350 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector. They measure the branching fractions {Beta}(B{sup +} {yields} {bar K}{sup 0}K{sup +}) = (1.61 {+-} 0.44 {+-} 0.09) x 10{sup -6} and {Beta}(B{sup 0} {yields} K{sup 0}{bar K}{sup 0}) = (1.08 {+-} 0.28 {+-} 0.11) x 10{sup -6}, and the CP-violating charge asymmetry {Alpha}{sub CP} ({bar K}{sup 0} K{sup +}) = 0.10 {+-} 0.26 {+-} 0.03. Using a vertexing technique previously employed in several analyses of all-neutral final states conta…

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationGeneral Physics and AstronomyCharge (physics)01 natural sciencesNuclear physicsParticle decayCrystallographyPair production0103 physical sciencesCP violation010306 general physicsBar (unit)Physical Review Letters
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Measurement of the Absolute Branching Fraction of the Inclusive Decay Λc+ → Λ+X

2018

Physical review letters 121(6), 062003 (2018). doi:10.1103/PhysRevLett.121.062003

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationHigh Energy Physics::PhenomenologyAnalytical chemistryGeneral Physics and AstronomyLambda01 natural sciences530NOLuminosityCharmed baryonsPhysics and Astronomy (all)0103 physical sciencesCP violationHigh Energy Physics::Experimentddc:530010306 general physicsBar (unit)
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Observation of the Bottomonium Ground State in the Decay Υ(3S)→γηb

2008

The authors report the results of a search for the bottomonium ground state {eta}{sub b}(1S) in the photon energy spectrum with a sample of (109 {+-} 1) million of {Upsilon}(3S) recorded at the {Upsilon}(3S) recorded at the {Upsilon}(3S) energy with the BABAR detector at the PEP-II B factory at SLAC. They observe a peak in the photon energy spectrum at E{sub {gamma}} = 921.2{sub -2.8}{sup +2.1}(stat) {+-} 2.4(syst) MeV with a significance of 10 standard deviations. They interpret the observed peak as being due to monochromatic photons from the radiative transition {Upsilon}(3S) {yields} {gamma} {eta}{sub b}(1S). This photon energy corresponds to an {eta}{sub b}(1S) mass of 9388.9{sub -2.3}{…

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationParticle physicsGeneral Physics and AstronomyBABAR detectorPhoton energy01 natural sciencesB-factoryParticle decay0103 physical sciencesHigh Energy Physics::ExperimentAtomic physicsNuclear Experiment010306 general physicsGround stateFísica de partículesExperimentsHyperfine structureEnergy (signal processing)
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Search for Radiative Penguin DecaysB+→ρ+γ,B0→ρ0γ, andB0→ωγ

2005

A search for the decays B {yields} {rho}(770){gamma} and B{sup 0} {yields} {omega}(782) is performed on a sample of 211 million {Upsilon}(4S) {yields} B{bar B} events collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. No evidence for the decays is seen. We set the following limits on the individual branching fractions {Beta}(B{sup +} {yields} {rho}{sup +}{gamma}) < 1.8 x 10{sup -6}, {Beta}(B{sup 0} {yields} {rho}{sup 0}{gamma}) < 0.4 x 10{sup -6}, and {Beta}(B{sup 0} {yields} {omega}{gamma}) < 1.0 x 10{sup -6} at the 90% confidence level (C.L.). We use the quark model to limit the combined branching fraction {bar {Beta}}[B {yields} ({rho}/{omega})…

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationQuark modelRadiative decayGeneral Physics and Astronomy01 natural sciencesOmegaCrystallography0103 physical sciencesRadiative transferB meson010306 general physicsPhysical Review Letters
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Search for the Radiative DecaysB→ργandB0→ωγ

2004

A search for the exclusive radiative decays B {yields} {rho}(770){gamma} and B{sup 0} {yields} {omega}(782){gamma} is performed on a sample of about 84 million B{bar B} events collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. No significant signal is seen in any of the channels. We set upper limits on the branching fractions {Beta} of {Beta}(B{sup 0} {yields} {rho}{sup 0}{gamma}) < 1.2 x 10{sup -6}, {Beta}(B{sup +} {yields} {rho}{sup +}{gamma}) < 2.1 x 10{sup -6}, and {Beta}(B{sup 0} {yields} {omega}{gamma}) < 1.0 x 10{sup -6} at 90% confidence level (C.L.). Using the assumption that {Lambda}(B {yields} {rho}{gamma}) = {Lambda}(B{sup +} {yields} …

Physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilationRadiative decayGeneral Physics and Astronomy01 natural sciencesOmegaCrystallography0103 physical sciencesRadiative transferB mesonAtomic physics010306 general physicsPhysical Review Letters
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Tests ofCPTsymmetry inB0−B¯0mixing and inB0→cc¯K0decays

2016

Using the eight time dependences for the decays Upsilon(4S)-> B0 B0bar -> fj fk with the dacay into a flavor-specific state fj = ell+- X before or after the decay into a CP eigenstate fk = c cbar KS,KL, as measured by the BABAR experiment, we determine the three CPT-sensitive parameters Re(z) and Im(z) in B0-B0bar mixing and |Abar/A| in B0 -> c cbar K0 decays. We find Im(z) = 0.010 +- 0.030 +- 0.013, Re(z) = -0.065 +- 0.028 +- 0.014, and |Abar/A| = 0.999 +- 0.023 +- 0.017, in agreement with CPT symmetry.

Physics010308 nuclear & particles physicsCPT symmetryElectron–positron annihilation0103 physical sciencesAnalytical chemistryBaBar experiment010306 general physics01 natural sciencesMixing (physics)Bar (unit)Physical Review D
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Precision Measurement of the e+e−→Λc+Λ¯c− Cross Section Near Threshold

2018

The cross section of the e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (-)(c) process is measured with unprecedented precision using data collected with the BESIII detector at root s = 4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Lambda(+)(c)(Lambda) over bar (-)(c) production threshold is cleared. At center-of-mass energies root s = 4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Lambda(c) polar angle distributions. From these, the.c electric over magnetic form-factor ratios (vertical bar G(E)/G(M)vertical bar) are measured for the first time. They are found to be 1.14 +/- 0.14 +/- 0.07 and 1.23 +/- 0.05 +/- 0.03, respectively, where the …

Physics010308 nuclear & particles physicsElectron–positron annihilationAnalytical chemistryGeneral Physics and AstronomyLambda01 natural sciencesNear thresholdCross section (physics)Angular distribution0103 physical sciencesHigh Energy Physics::ExperimentBorn approximation010306 general physicsClearanceBar (unit)Physical Review Letters
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Observation of a Neutral Charmoniumlike StateZc(4025)0ine+e−→(D*D¯*)0π0

2015

We report a study of the process e(+)e(-) -> (D*(D) over bar*)(0)pi(0) using e(+)e(-) collision data samples with integrated luminosities of 1092 pb(-1) at root s = 4.23 GeV and 826 pb(-1) at root s = 4.26 GeV collected with the BESIII detector at the BEPCII storage ring. We observe a new neutral structure near the (D*(D) over bar*)(0) mass threshold in the pi(0) recoil mass spectrum, which we denote as Z(c)(4025)(0). Assuming a Breit-Wigner line shape, its pole mass and pole width are determined to be (4025.5(-4.7)(+2.0) +/- 3.1) MeV/c(2) and (23.0 +/- 6.0 +/- 1.0) MeV, respectively. The Born cross sections of e(+)e(-) -> Z(c)(4025)(0)pi(0) -> (D*(D) over bar*)(0)pi(0) are measured to be (…

Physics010308 nuclear & particles physicsElectron–positron annihilationAnalytical chemistryGeneral Physics and AstronomyMass spectrometry01 natural sciencesAtomic massRecoil0103 physical sciencesMass spectrumPiAtomic physicsBorn approximation010306 general physicsBar (unit)Physical Review Letters
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