Search results for "decay"

showing 10 items of 2087 documents

Search for the decayB0→J/ψγ

2004

We present the results of a search for the radiative decay B0 --> J/psi gamma in a data set containing 123 million Y(4S)--> B B-bar decays, collected by the BABAR detector at the PEP-II asymmetric-energy e+e- storage ring at SLAC. We find no evidence for a signal and place an upper limit of B(B0 --> J/psi gamma) < 1.6 x 10^-6 at 90% confidence level.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionRadiative decay01 natural sciencesEngineering physicsParticle identificationParticle decay0103 physical sciencesHigh Energy Physics::Experiment010306 general physicsStorage ringPhysical Review D
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Measurement of the branching fraction and theCP-violating asymmetry for the decayB0→KS0π0

2005

The authors measure the branching fraction and the CP-violating asymmetry of B{sup 0} {yields} K{sub S}{sup 0}{pi}{sup 0} decays with 227 million {Upsilon}(4S) {yields} B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. They obtain a branching fraction {Beta}(B{sup 0} {yields} K{sup 0}{pi}{sup 0}) = (11.4 {+-} 0.9 {+-} 0.6) x 10{sup -6} and CP-violating asymmetry parameters C{sub K{sub S}{sup 0}{pi}{sup 0}} = 0.06 {+-} 0.18 {+-} 0.03 and S{sub K{sub S}{sup 0}{pi}{sup 0}} = 0.35{sub -0.33}{sup +0.30} {+-} 0.04, where the first error is statistical and the second systematic.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionmedia_common.quotation_subject01 natural sciencesAsymmetryParticle identificationCrystallographyParticle decay0103 physical sciences010306 general physicsmedia_commonPhysical Review D
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Measurement of the branching fraction and decay rate asymmetry ofB−→Dπ+π−π0K−

2005

The authors report the observation of the decay B{sup -} {yields} D{sub {pi}{sup +}{pi}{sup -}{pi}{sup 0}}K{sup -}, where D{sub {pi}{sup +}{pi}{sup -}{pi}{sup 0}} indicates a neutral D meson detected in the final state {pi}{sup +}{pi}{sup -}{pi}{sup 0}, excluding K{sub S}{sup 0}{pi}{sup 0}. This doubly Cabibbo-suppressed decay chain can be used to measure the CKM phase {gamma}. Using about 229 million e{sup +}e{sup -} {yields} B{bar B} events recorded by the BABAR experiment at the PEP-II e{sup +}e{sup -} storage ring, they measure the branching fraction {Beta}(B{sup -} {yields} D{sub {pi}{sup +}{pi}{sup -}{pi}{sup 0}K{sup -}}) = (5.5 {+-} 1.0 (stat.) {+-} 0.7 (syst.)) x 10{sup -6} and the …

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionmedia_common.quotation_subject01 natural sciencesAsymmetryParticle identificationCrystallographyParticle decayTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY0103 physical sciencesD mesonB meson010306 general physicsmedia_commonPhysical Review D
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Measurement of theCP-violating asymmetries inB0→Ks0π0and of the branching fractionB0→K0π0

2008

We present a measurement of the time-dependent CP-violating asymmetries in B-0 -> K-S(0)pi(0) decays based on 383x10(6) Upsilon(4S)-> B (B) over bar events collected by the BABAR experiment at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. We measure the direct CP-violating asymmetry C-KS(0)pi(0)=0.24 +/- 0.15 +/- 0.03 and the CP-violating asymmetry in the interference between mixing and decay S-KS(0)pi(0)=0.40 +/- 0.23 +/- 0.03, where the first errors are statistical and the second are systematic. On the same sample, we measure the decay branching fraction, obtaining B(B-0 -> K-0 pi(0))=(10.3 +/- 0.7 +/- 0.6)x10(-6).

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionmedia_common.quotation_subjectElectron–positron annihilationBaBar experiment01 natural sciencesAsymmetryParticle identificationB-factoryNuclear physicsParticle decay0103 physical sciencesCP violation010306 general physicsmedia_commonPhysical Review D
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Measurements of theB→D*form factors using the decayB¯0→D*+e−ν¯e

2006

We measure the dependence of (B) over bar (0)-> D(*+)e(-)(B) over bar (e) on the decay angles and momentum transfer. The data sample consists of similar to 86x10(6) B (B) over bar -pairs accumulated on the Upsilon(4S) resonance by the BABAR detector at the asymmetric e(+)e(-) collider PEP-II. We specify the three form factors by two ratios R-1 and R-2, and by a single parameter rho(2) characterizing the polynomial representing h(A1), the function which describes the momentum-transfer dependence of the form factor A(1). We determine R-1, R-2, and rho(2) using an unbinned maximum likelihood fit to the full decay distribution. The results are R-1=1.396 +/- 0.060 +/- 0.035 +/- 0.027, R-2=0.885 …

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsCabibbo–Kobayashi–Maskawa matrixElectron–positron annihilationMonte Carlo methodMomentum transferResonance01 natural sciencesParticle identificationParticle decay0103 physical sciencesStatistical physics010306 general physicsBar (unit)Physical Review D
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Neutrinoless double beta decay in light of SNO salt data

2003

In the SNO data from its salt run, probably the most significant result is the consistency with the previous results without assuming the 8B energy spectrum. In addition, they have excluded the maximal mixing at a very high confidence level. This has an important implication on the double beta decay experiments. For the inverted or degenerate mass spectrum, we find |_{ee}| > 0.013 eV at 95% CL, and the next generation experiments can discriminate Majorana and Dirac neutrinos if the inverted or degenerate mass spectrum will be confirmed by the improvements in cosmology, tritium data beta decay, or long-baseline oscillation experiments.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsDegenerate energy levelsFOS: Physical sciences01 natural sciences7. Clean energyBeta decayNuclear physicsHigh Energy Physics - PhenomenologyMAJORANAHigh Energy Physics - Phenomenology (hep-ph)Double beta decay0103 physical sciencesMass spectrumAstronomiaHigh Energy Physics::ExperimentNeutrino010306 general physicsNeutrino oscillationBar (unit)
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Search for neutrinoless double-beta decay ofMo100with the NEMO-3 detector

2014

We report the results of a search for the neutrinoless double-$\beta$ decay (0$\nu\beta\beta$) of $^{100}$Mo, using the NEMO-3 detector to reconstruct the full topology of the final state events. With an exposure of 34.7 kg.y, no evidence for the 0$\nu\beta\beta$ signal has been found, yielding a limit for the light Majorana neutrino mass mechanism of $T_{1/2}(0\nu\beta\beta)>1.1 \times 10^{24}$ years (90% C.L.) once both statistical and systematic uncertainties are taken into account. Depending on the Nuclear Matrix Elements this corresponds to an upper limit on the Majorana effective neutrino mass of $ < 0.3-0.8$ eV (90% C.L.). Constraints on other lepton number violating mechanisms of 0$…

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsElectron01 natural sciencesBeta decayLepton numberNuclear physicsMAJORANADouble beta decay0103 physical sciencesBeta (velocity)Neutrino010306 general physicsEnergy (signal processing)Physical Review D
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Search for neutralB-meson decays toa0π,a0K,ηρ0, andηf0

2007

We present a search for B0 decays to charmless final states involving an eta meson, a charged pion and a second charged pion or kaon. The data sample corresponds to 383x10^6 BBbar pairs collected with the BABAR detector operating at the PEP-II asymmetric-energy B Factory at SLAC. We find no significant signals and determine the following 90% C.L. upper limits: BR(B->a0-pi+) x BR(a0- -> etapi-) a0-K+) x BR(a0- -> etapi-) a0(1450)-pi+) x BR(a0(1450)- -> etapi-) a0(1450)-K+) x BR(a0(1450)- -> etapi-) etarho0) eta f0(980)) x BR(f0(980)- -> pi+pi-) < 0.4x10^-6.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsElectron–positron annihilationEta meson01 natural sciencesB-factoryNuclear physicsParticle decayPion0103 physical sciencesB meson010306 general physicsPhysical Review D
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Measurement of the time-dependentCP-violating asymmetry inB0→KS0π0γdecays

2005

We present a measurement of the time-dependent CP-violating asymmetry in B{sup 0} {yields} K*{sup 0}{gamma} decays with K*{sup 0} {yields} K{sub S}{sup 0}{pi}{sup 0} based on 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. In a sample containing 157 {+-} 16 signal decays, we measure S{sub K*{sup 0}{gamma}} = -0.21 {+-} 0.40 {+-} 0.05 and C{sub K*{sup 0}{gamma}} = -0.40 {+-} 0.23 {+-} 0.03, where the first error is statistical and the second systematic. We also explore B{sup 0} {yields} K{sub S}{sup 0}{pi}{sup 0}{gamma} decays with 1.1 < m{sub K{sub S}{sup 0}{pi}{sup 0}} < 1.8 GeV/c{sup 2}…

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsElectron–positron annihilationmedia_common.quotation_subject01 natural sciencesAsymmetryParticle identificationParticle decayCrystallography0103 physical sciencesCP violationB meson010306 general physicsmedia_commonPhysical Review D
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Measurement of the double-βdecay half-life ofNd150and search for neutrinoless decay modes with the NEMO-3 detector

2009

The half-life for double-{beta} decay of {sup 150}Nd has been measured by the NEMO-3 experiment at the Modane Underground Laboratory. Using 924.7 days of data recorded with 36.55 g of {sup 150}Nd, we measured the half-life for 2{nu}{beta}{beta} decay to be T{sub 1/2}{sup 2{nu}}=(9.11{sub -0.22}{sup +0.25}(stat.){+-}0.63(syst.))x10{sup 18} yr. The observed limit on the half-life for neutrinoless double-{beta} decay is found to be T{sub 1/2}{sup 0{nu}}>1.8x10{sup 22} yr at 90% confidence level. This translates into a limit on the effective Majorana neutrino mass of <4.0-6.3 eV if the nuclear deformation is taken into account. We also set limits on models involving Majoron emission, right-hand…

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsElementary particle7. Clean energy01 natural sciencesBeta decayNuclear physicsMAJORANADouble beta decay0103 physical sciencesNeutrino010306 general physicsRadioactive decayMajoronLeptonPhysical Review C
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