1,748,368 research outputs found
Observation of a(0)(0)(980)-f(0)(980) Mixing
No full textKolcu, Onur Buğra (Arel Author)We report the first observation of a(0)(0)(980)-f(0)(980) mixing in the decays of J/psi -> phi f(0)(980) -> phi a(0)(0)(980) -> phi eta pi(0) and chi(c1) -> a(0)(0)(980)pi(0) -> f(0)(980)pi(0)->pi(+)pi(-)pi(0), using data samples of 1.31 x 10(9) J/psi events and 4.48 x 10(8) psi (3686) events accumulated with the BESIII detector. The signals of f(0)(980) -> a(0)(0)(980) and a(0)(0)(980) -> f(0)(980) mixing are observed at levels of statistical significance of 7.4 sigma and 5.5 sigma, respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, g(a0K+K-) and g(f0K+K-), are estimated. The results improve the understanding of the nature of a(0)(0)(980) and f(0)(980)
Rock magnetics of ODP Site 162-980
No full textA detailed record of variations in the direction and intensity of the geomagnetic field over the past 1.2 Myrs has been obtained from an ~120-m-thick sedimentary section cored at ODP Site 980 on the Feni Drift (North Atlantic). The record has high resolution due to high mean sedimentation rates (11.3 cm/kyr for the Brunhes Chron and 5.5 cm/kyr for the Matuyama Chron), paleomagnetic measurements every 1 cm along u-channel samples, and high quality isotopic age control. The Iceland Basin Event is manifest by virtual geomagnetic poles crossing the equator at ~190 ka. The base of the recovered section lies immediately below the Cobb Mountain Subchronozone that occurs within marine isotope stage 35. Normalized remanence data can be correlated to paleointensity records from ODP Sites 983 and 984 (~700 km to the NW from Site 980) and with lower resolution paleointensity data from the Pacific Ocean. Differences between the Site 980 paleointensity record and the Pacific records are attributed to variable sedimentation rates, variable quality age control, and inadequacies in the normalization procedure used to derive the paleointensity proxies
Observation of the rare decay B+ -> K+π0π0 and measurement of the quasi-two-body contributions B+ -> K*(892)+π0, B+ -> f0(980)K+, and B+ -> χc0K+
Get PDFWe report an analysis of charmless hadronic decays of charged B mesons to the final state K(+) pi(0)pi(0), using a data sample of (470.9 +/- 2.8) x 10(6) B (B) over bar events collected with the BABAR detector at the Y(4S) resonance. We observe an excess of signal events, with a significance above 10 standard deviations including systematic uncertainties, and measure the branching fraction and CP asymmetry to be B(B(+) -> K(+) pi(0)pi(0)) = (16.2 +/- 1.2 +/- 1.5) x 10(-6) and A(CP)(B(+) -> K(+) pi(0)pi(0)) = -0.06 +/- 0.06 +/- 0.04, where the uncertainties are statistical and systematic, respectively. Additionally, we study the contributions of the B(+) -> K*(892)(+) pi(0), B(+) -> f(0)(980)K(+), and B(+) -> chi(c0)K(+) quasi-two-body decays. We report the world's best measurements of the branching fraction and CP asymmetry of the B(+) -> K(+) pi(0)pi(0) and B(+) -> K(+)(892)(+) pi(0) channels
Study of a00(980)-f0(980) mixing
Get PDFUsing samples of 2.25×108 J/ψ events and 1.06×108 ψ ′ events collected with the BES III detector, we study the f 0(980)→a00(980) and a00(980)→f 0(980) transitions in the processes J/ψ→φf 0(980) →φa00(980) and χ c1→π0a00(980)→π0f 0(980), respectively. Evidence for f 0(980)→a00(980) is found with a significance of 3.4σ, while in the case of a00(980)→f 0(980) transition, the significance is 1.9σ. Measurements and upper limits of both branching ratios and mixing intensities are determined. © 2011 American Physical Society.published_or_final_versio
Measurement of the CP violating phase φs in Bs0→J/f0(980)
Get PDFMeasurement of mixing-induced CP violation in decays is of prime importance in probing new physics. So far only the channel has been used. Here we report on a measurement using an LHCb data sample of 0.41 fb−1, in the CP odd eigenstate J/ψf0(980), where f0(980)→π+π−. A time-dependent fit of the data with the lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from yields a value of the CP violating phase of −0.44±0.44±0.02 rad, consistent with the Standard Model expectation
Observation of a00 (980)-f0 (980) Mixing
No full textWe report the first observation of a00(980)-f0(980) mixing in the decays of J/ψ→φf0(980)→φa00(980)→φηπ0 and χc1→a00(980)π0→f0(980)π0→π+π-π0, using data samples of 1.31×109 J/ψ events and 4.48×108 ψ(3686) events accumulated with the BESIII detector. The signals of f0(980)→a00(980) and a00(980)→f0(980) mixing are observed at levels of statistical significance of 7.4σ and 5.5σ, respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, ga0K+K- and gf0K+K-, are estimated. The results improve the understanding of the nature of a00(980) and f0(980).Collaborative Innovation Center for 11179007, KJCX2-YW-N29, KJCX2-YW-N45, U1232201, U1332201, U1532102German Research Foundation DFG CRC-1044INPACInstitute of Nuclear and Particle Physics, Astronomy and CosmologyMinistry of Development of Turkey DPT2006K-120470National 1000 Talents Program of ChinaNational Key Basic Research Program of China 2015CB856700RuGU.S. Department of Energy DE-FG02-05ER41374, DE-SC-0010118, DE-SC-0010504, DE-SC-0012069Koninklijke Nederlandse Akademie van 530-4CDP03National Natural Science Foundation of 11125525, 11175189, 11235011, 11275189, 11322544, 11335008, 11375170, 11425524, 11475164, 11475169, 11675183, 11675184, 11705006, 11735014Russian Foundation for Basic Research 14-07-91152National Research Foundation of Korea R32-2008-000-10155-
Scalar mesons and tetraquarks by means of lattice QCD
No full textWe study the light scalar mesons a_0(980) and kappa using N_f = 2+1+1 flavor lattice QCD. In order to probe the internal structure of these scalar mesons, and in particular to identify, whether a sizeable tetraquark component is present, we use a large set of operators, including diquark-antidiquark, mesonic molecule and two-meson operators. The inclusion of disconnected diagrams, which are technically rather challenging, but which would allow us to extend our work to e.g. the f_0(980) meson, is introduced and discussed
Observation of a00(980)-f0(980) mixing
No full textBu çalışmada sadece Uludağ mensubu yazarların girişleri yapılmıştır.We report the first observation of a(0)(0)(980)-f(0)(980) mixing in the decays of J/psi -> phi f(0)(980) -> phi a(0)(0)(980) -> phi eta pi(0) and chi(c1) -> a(0)(0)(980)pi(0) -> f(0)(980)pi(0)->pi(+)pi(-)pi(0), using data samples of 1.31 x 10(9) J/psi events and 4.48 x 10(8) psi (3686) events accumulated with the BESIII detector. The signals of f(0)(980) -> a(0)(0)(980) and a(0)(0)(980) -> f(0)(980) mixing are observed at levels of statistical significance of 7.4 sigma and 5.5 sigma, respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, g(a0K+K-) and g(f0K+K-), are estimated. The results improve the understanding of the nature of a(0)(0)(980) and f(0)(980).National Basic Research Program of China
2015CB856700National Natural Science Foundation of China (NSFC)
11125525
11235011
11322544
11335008
11425524
11375170
11275189
11475169
11475164
11175189
11675183
11675184
11705006
11735014Chinese Academy of SciencesCAS Center for Excellence in Particle Physics (CCEPP)Collaborative Innovation Center for Particles and Interactions (CICPI)National Natural Science Foundation of China (NSFC)Chinese Academy of Sciences
11179007
U1532102
U1232201
U1332201
KJCX2-YW-N29
KJCX2-YW-N45National 1000 Talents Program of ChinaInstitute of Nuclear and Particle Physics, Astronomy and Cosmology (INPAC)Shanghai Key Laboratory for Particle Physics and CosmologyGerman Research Foundation (DFG)
Collaborative Research Center CRC-1044Istituto Nazionale di Fisica Nucleare (INFN)Koninklijke Nederlandse Akademie van Wetenschappen (KNAW)
530-4CDP03Türkiye Cumhuriyeti Kalkınma Bakanlığı
DPT2006K-120470Russian Foundation for Basic Research (RFBR)
Spanish Government
14-07-91152Swedish Research CouncilUnited States Department of Energy (DOE)
DE-FG02-05ER41374
DE-SC-0010118
DE-SC-0010504
DE-SC-0012069National Science Foundation (NSF)University of Groningen (RuG)Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), DarmstadtNational Research Foundation of Korea
R32-2008-000-10155-
Observation of a(0)(0)(980)-f(0)(980) Mixing
Get PDFWe report the first observation of a(0)(0)(980)-f(0)(980) mixing in the decays of J/psi -> phi f(0)(980) -> phi a(0)(0)(980) -> phi eta pi(0) and chi(c1) -> a(0)(0)(980)pi(0) -> f(0)(980)pi(0)->pi(+)pi(-)pi(0), using data samples of 1.31 x 10(9) J/psi events and 4.48 x 10(8) psi (3686) events accumulated with the BESIII detector. The signals of f(0)(980) -> a(0)(0)(980) and a(0)(0)(980) -> f(0)(980) mixing are observed at levels of statistical significance of 7.4 sigma and 5.5 sigma, respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, g(a0K+K-) and g(f0K+K-), are estimated. The results improve the understanding of the nature of a(0)(0)(980) and f(0)(980)
Observation of Mixing
No full textWe report the first observation of - mixing in the decays of and , using data samples of events and events accumulated with the BESIII detector. The signals of and mixing are observed at levels of statistical significance of and , respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, and , are estimated. The results improve the understanding of the nature of and
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