Search

Now showing items 1-10 of 74

Measurement of the Semileptonic Branching Fraction of the B_s Meson

Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Izen, Joseph M.; Lou, Xinchou (American Physical Society, 2012-01-03)

We report a measurement of the inclusive semileptonic branching fraction of the B_s meson using data collected with the BABAR detector in the center-of-mass energy region above the Υ(4S) resonance. We use the inclusive ...

Exclusive Measurements of b → sγ Transition Rate and Photon Energy Spectrum

Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2012-10-17)

We use 429 fb⁻¹ of e⁺e⁻ collision data collected at the Υ(4S) resonance with the BABAR detector to measure the radiative transition rate of b → sγ with a sum of 38 exclusive final states. The inclusive branching fraction ...

Search for Long-Lived Neutral Particles Decaying into Lepton Jets in Proton-Proton Collisions at √s = 8 TeV with the ATLAS Detector

Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Izen, Joseph M.; Leyton, Michael; Lou, Xinchou; Namasivayam, Harisankar; Reeves, Kendall; ATLAS Collaboration (Springer, 2014-11-18)

Several models of physics beyond the Standard Model predict neutral particles that decay into final states consisting of collimated jets of light leptons and hadrons (so-called "lepton jets"). These particles can also be ...

Search for the Rare Decays J/ψ → D_s⁻ ρ⁺ and J/ψ → D̅⁰ K̅*⁰.

Ablikim, M.; Achasov, M. N.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; An, F. F.; Lou, Xinchou (Amer Physical Soc, 2014-04-09)

A search for the rare decays of J/ψ D_₈⁻ ρ⁺ + c.c. and J/ψ → D̅⁰ K̅*⁰ + c.c is performed with a data sample of 225.3-million J/ψ events collected with the Beijing Spectrometer III detector. No evident signal is observed. ...

Precision Measurements of B(D⁺ → μ⁺ν_μ), the Pseudoscalar Decay Constant ʄ_D⁺ and the Quark Mixing Matrix Element |V_{cd}|

Ablikim, M.; Achasov, M. N.; Ai, X. C.; Albayrak, O.; Ambrose, D. J.; An, F. F.; An, Q.; Lou, Xinchou (Amer Physical Soc, 2014-03)

We report a measurement of the branching fraction B(D⁺ → μ⁺ν_μ) = [3.71 ± 0.19(stat) ± 0.06(sys)] x 10⁻⁴ based on 2.92 fb⁻¹ of data accumulated at √s = 3.773 GeV with the BESIII detector at the BEPCII collider. This ...

Search for B→K^{(*)}νν̅ and Invisible Quarkonium Decays

Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Izen, Joseph M.; Lou, Xinchou (American Physical Society, 2013-06-05)

We search for the flavor-changing neutral-current decays B→K^{(*)}νν¯, and the invisible decays J/ψ→νν̅ and ψ(2S)→νν̅ via B→K^{(*)}J/ψ and B→K^{(*)}ψ(2S), respectively, using a data sample of 471×10⁶ BB̅ pairs collected ...

Precision Measurement of the B→X_sγ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry A_{CP}(B→X_{s+d}γ)

Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2012-11-09)

The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→X_sγ plus B→X_dγ, is studied using a data sample of (382.8 ± 4.2)×10⁶Υ(4S) →BB̄ decays collected by the BABAR experiment at SLAC. ...

Measurement of the B → X₋s ℓ⁺ℓ⁻ Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States

Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2014-05-30)

We measure the total branching fraction of the flavor-changing neutral-current process B→X_s ℓ⁺ℓ⁻, along with partial branching fractions in bins of dilepton and hadronic system (X_s) mass, using a sample of 471 x 10⁶ ϒ(4S) ...

Evidence for the Baryonic Decay B̅→ D⁰ΛΛ̅

Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Lou, Xinchou; Izen, Joseph M.; BaBar Collaboration (2014-06-06)

Evidence is presented for the baryonic B meson decay B̅⁰ → D⁰ΛΛ̅ based on a data sample of 471 x 10⁶ BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric e⁺e⁻ collider located at the SLAC National Accelerator ...

Search for a Light Higgs Boson Decaying to Two Gluons or ss̅ in the Radiative Decays of ϒ(1s)

Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2013-08-06)

We search for the decay ϒ(1s) → γA⁰, A⁰ → gg or ss̅, where A⁰ is the pseudoscalar light Higgs boson predicted by the next-to-minimal supersymmetric Standard Model. We use a sample of (17.6 ± 0.3) x10⁶ ϒ(1s) mesons produced ...

1
2
3
4
. . .
8