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  • Branching Fractions
  • A Frey

    Prominent publications by A Frey

    KOL Index score: 8569

    In the late fall and early winter, The Johns Hopkins University HF radar at Goose Bay, Labrador, observes the effects of atmospheric gravity waves on radar transmissions that are obliquely reflected from the ionosphere and subsequently backscattered from the Earth's surface. The waves exist under a wide variety of geomagnetic conditions; how ever, they are particularly noticeable under quiet conditions (0 ≤ Kp ≤ 1 +). The clearest signatures of the waves are spatially localized ...

    Also Ranks for: Gravity Waves |  goose bay |  lower atmosphere |  earths surface |  auroral electrojet
    KOL Index score: 6345

    A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e+e− collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have ...

    Also Ranks for: Charged Particles |  production cross |  ee− collisions |  fractional charge |  gev mass
    KOL Index score: 5432

    Deep inelastic charged-current reactions have been studied ine+p ande−p collisions at a center of mass energy of about 300GeV in the kinematic regionQ2>200GeV2 andx>0.006 using the ZEUS detector at HERA. The integrated cross sections forQ2>200GeV2 are found to be ...

    Also Ranks for: Zeus Detector |  usepackagemathrsfs usepackageupgreek |  setlength oddsidemargin69pt |  mass energy |  differential cross sections
    KOL Index score: 5365

    We report the results of a study of the exclusive semileptonic decays B-→π0ℓ-ν¯ℓ, B¯0→π+ℓ-ν¯ℓ, B-→ρ0ℓ-ν¯ℓ, B¯0→ρ+ℓ-ν¯ℓ and B-→ωℓ-ν¯ℓ, where ℓ represents an electron or a muon. The events are tagged by fully reconstructing a second B meson in the event in a hadronic decay mode. The measured branching fractions are B(B-→π0ℓ-ν¯ℓ)=(0.80±0.08±0.04)×10-4, B(B¯0→π+ℓ-ν¯ℓ)=(1.49±0.09±0.07)×10-4, B(B-→ρ0ℓ-ν¯ℓ)=(1.83±0.10±0.10)×10-4, B(B¯0→ρ+ℓ-ν¯ℓ)=(3.22±0.27±0.24)×10-4, and ...

    Also Ranks for: Belle Experiment |  branching fractions |  hadronic decay |  υ4s resonance |  772×106 bb¯ pairs
    KOL Index score: 5362

    The cross section for ee+ e- → π+ π- J/ψ between 3.8 and 5.5 GeV is measured with a 967  fb(-1) data sample collected by the Belle detector at or near the Υ(nS) (n = 1,2,…,5) resonances. The Y(4260) state is observed, and its resonance parameters are determined. In addition, an excess of π+ π- J/ψ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the Y(4008) state that was previously reported by ...

    Also Ranks for: Charmoniumlike State |  belle study |  resonance parameters |  ee→ππj ψ |  gev observed
    KOL Index score: 5264

    Administration of the glucocorticoid dexamethasone to rats significantly stimulated the synthesis of ribosomal RNA by hepatic nuclei in vitro, as determined by hybridization to plasmid DNA containing the appropriate gene from X. laevis. This effect was also seen in rats in which RNA polymerase B had previously been blocked by the administration of alpha-amanitin. RNA synthesized in response to the hormone hybridized to both the 5' and 3' end of the gene for the precursor to ribosomal ...

    Also Ranks for: Ribosomal Rna |  dexamethasone liver |  glucocorticoids synthesis |  inbred strains |  transcription genetic
    KOL Index score: 5220

    Photoproduction events which have two or more jets have been studied in the Wγp range 135 GeV < Wγp < 280 GeV with the ZEUS detector at HERA. A class of events is observed with little hadronic activity between the jets. The jets are separated by pseudorapidity intervals (Δη) of up to four units and have transverse energies greater than 6 GeV. A gap is defined as the absence between the jets of particles with transverse energy greater than 300 MeV. The fraction of events containing a gap ...

    Also Ranks for: Rapidity Gaps |  photoproduction events |  transverse energy |  zeus detector |  wγp range
    KOL Index score: 5037

    We report measurements of the branching fractions and direct CP asymmetries (ACP) for B→Kπ, ππ and KK decays (but not π0π0) based on the final data sample of 772×106 BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We set a 90% confidence-level upper limit for K+K- at 2.0×10-7; all other decays are observed with branching fractions ranging from 10-6 to 10-5. In the B0/B¯0→K±π∓ mode, we confirm Belle’s previously reported ...

    Also Ranks for: Branching Fractions |  direct asymmetries |  decays measurements |  data sample |  belle detector

    The BABAR detector

    KOL Index score: 4975

    BABAR, the detector for the SLAC PEP-II asymmetric e+e− B Factory operating at the ϒ(4S) resonance, was designed to allow comprehensive studies of CP-violation in B-meson decays. Charged particle tracks are measured in a multi-layer silicon vertex tracker surrounded by a cylindrical wire drift chamber. Electromagnetic showers from electrons and photons are detected in an array of CsI crystals located just inside the solenoidal coil of a superconducting magnet. Muons and neutral hadrons ...

    Also Ranks for: Babar Detector |  drift chamber |  charged hadrons |  ϒ4s resonance |  data acquisition
    KOL Index score: 4936

    A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at [Formula: see text], corresponding to an integrated luminosity of approximately 600 pb-1. Charged Higgs bosons are assumed to be pair-produced and to decay into [Formula: see text], τντ or AW±. No signal is observed. Model-independent limits on the charged Higgs-boson production cross section are ...

    Also Ranks for: Charged Higgs Bosons |  integrated luminosity |  branching ratio |  95 confidence level |  model parameter space
    KOL Index score: 4823

    Dijet production by almost real photons has been studied at HERA with the ZEUS detector. Jets have been identified using the cone algorithm. A cut on xγOBS, the fraction of the photon energy participating in the production of the two jets of highest transverse energy, is used to define cross sections sensitive to the parton distributions in the proton and in the photon. The dependence of the dijet cross sections on pseudorapidity has been measured for xγOBS ⩾ 0.75 and xγOBS < 0.75. The ...

    Also Ranks for: Dijet Cross Sections |  production jets |  zeus detector |  parton distributions |  real photons
    KOL Index score: 4800

    We report a measurement of the branching fraction ratios R(D(*)) of B¯→D(*)τ-ν¯τ relative to B¯→D(*)ℓ-ν¯ℓ (where ℓ=e or μ) using the full Belle data sample of 772×106BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured values are R(D)=0.375±0.064(stat)±0.026(syst) and R(D*)=0.293±0.038(stat)±0.015(syst). The analysis uses hadronic reconstruction of the tag-side B meson and purely leptonic τ decays. The results are ...

    Also Ranks for: Branching Ratio |  hadronic tagging |  b¯→dℓν¯ℓ decays |  ℓe μ |  belle detector
    KOL Index score: 4779

    We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of Upsilon(4S) decays collected in 2001, bringing the data available to 32 x 10(6) BB macro pairs. We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. ...

    Also Ranks for: B0 Meson |  neutral decays |  babar detector |  direct violation |  decay products
    KOL Index score: 4731

    We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23x10(6) Upsilon(4S)-->BbarB decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we find events in which one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the ...

    Also Ranks for: B0 Decays |  neutral meson |  violating asymmetries |  babar detector |  data sample
    KOL Index score: 4706

    This paper describes a topological search for an invisibly decaying Higgs boson, H, produced via the Bjorken process (e+e-→HZ). The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209 GeV corresponding to a total integrated luminosity of 629 pb-1. In the analysis only hadronic decays of the Z boson are considered. A scan over Higgs boson masses from 1 to 120 GeV and decay widths from 1 to 3000 GeV revealed no indication for a ...

    Also Ranks for: Higgs Boson |  opal detector |  invisibly decaying |  209 gev |  decay width


    A Frey: Influence Statistics

    Sample of concepts for which A Frey is among the top experts in the world.
    Concept World rank
    neutron scattering technic #1
    model calculation inverse #1
    intensity evaluations #1
    effective analyzing polarimeter #1
    n034 gev #1
    a″ optical branches #1
    optical modes neighbourhood #1
    experimental uncertainties result #1
    precession neutron spin #1
    intensity evaluations model #1
    quasifree 2he→e′n→p reaction #1
    mcritical point #1
    form factors proton #1
    n034 gev c200611±00069stat0006900055syst #1
    result n034 gev #1
    polarization scattered neutrons #1
    walls plastic scintillators #1
    measurement effective analyzing #1
    scattered neutrons polarimeter #1
    c200611±00069stat0006900055syst #1
    plastic scintillators precession #1
    mainz microtron n034 #1
    neighbourhood mcritical point #1
    quasifree h2e→e′n→p reaction #1
    preliminary report experimental #1
    polarimeter walls #1
    recoil polarisation #2
    neutron variety #2
    extended shell model #2
    magnetic moments vital #2
    polarimeter beam polarization #2
    bg sequence #2
    trennung identifizierung #2
    invariant mass pions #2
    vec quasifree kinematics #3
    polarisationpx recoil proton #3
    error ofδpx px≈10 #3
    proton usepackageamsmath #3
    e vec #3
    polarisationpx #3
    vec enddocument reaction #3
    modern cw accelerators #3
    nucleon polarisationpx #3
    polarisation transfer proton #3

    Key People For Branching Fractions

    Top KOLs in the world
    Sheldon L Stone
    branching fractions integrated luminosity usepackagemathrsfs usepackageupgreek
    Claudia Patrignani
    branching fractions babar detector integrated luminosity
    atlas detector 13 tev higgs boson
    S Eidelman
    branching fraction belle detector integrated luminosity
    G Eigen
    atlas detector higgs boson 13 tev
    Olivier P Schneider
    branching fraction integrated luminosity belle detector

    A Frey:Expert Impact

    Concepts for whichA Freyhas direct influence:Branching fractions,  Opal detector,  Higgs bosons,  Belle detector,  Belle kekb,  Ee− collisions,  Large rapidity gap,  Branching ratio.

    A Frey:KOL impact

    Concepts related to the work of other authors for whichfor which A Frey has influence:Branching fractions,  Usepackagemathrsfs usepackageupgreek,  Form factors,  Babar detector,  Integrated luminosity,  Deep inelastic scattering,  Data sample.



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    Georg-August-Universität Göttingen, II. Physikalisches Institut, 37073 Göttingen, Germany | II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen, Germany | II. Physikalisches Institut, Georg-August-Universität Göttingen, 3