Measurement of branching fractions of hadronic decays of the Ω c 0 baryon
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Engineering topics
Chang, P.
Publications and source records attributed to Chang, P..
Measurements of the absolute branching fractions of B + → X c c ¯ K + and B + → D ¯ ( * ) 0 π + at Belle
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the τ lepton polarization and R ( D * ) in the decay B ¯ → D * τ − ν ¯ τ with one-prong hadronic τ decays at Belle
Not Available
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Search for B → h ν ν - decays with semileptonic tagging at Belle
We present the results of a search for the rare decays B → hνv¯, where h stands for K + , K$^{0}_{S}$, K* + , K* 0 , π + , π 0 , ρ + and ρ 0 . The results are obtained with 772 × 10 6 BB¯ pairs collected with the Belle detector at the KEKB e + e – collider. We reconstruct one B meson in a semileptonic decay and require a single h meson but nothing else on the signal side. We observe no significant signal and set upper limits on the branching fractions. The limits set on the B 0 → K$^{0}_{S}$νv¯, B 0 → K *0 νv¯, B + → π + νv¯, B 0 → π 0 νv¯, B + → ρ + νv¯, and B 0 → ρ 0 νv¯ channels are the world’s most stringent.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of branching fraction and direct C P asymmetry in charmless B + → K + K - π + decays at Belle
We introduce a study of the charmless hadronic decay of the charged B meson to the three-body final state K + K - π + . The results are based on a data sample that contains 772 × 1 0 6 B B ¯ pairs collected at the Υ ( 4 S ) resonance with the Belle detector at the KEKB asymmetric-energy e + e - collider. The measured inclusive branching fraction and direct C P asymmetry are ( 5.38 ± 0.40 ± 0.35 ) × 10 - 6 and - 0.170 ± 0.073 ± 0.017 , respectively, where the first uncertainties are statistical and the second are systematic. The K + K - invariant mass distribution of the signal candidates shows an excess in the region below 1.5 GeV / c 2 , which is steady with the previous studies from BABAR and LHCb. In addition, strong evidence of a large direct C P asymmetry is found in the low K + K - invariant-mass region.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the τ Lepton Polarization and R ( D * ) in the Decay B ¯ → D * τ - ν ¯ τ
Here, we discuss the first measurement of the τ lepton polarization P τ ( D * ) in the decay B ¯ → D * τ - ν ¯ τ as well as a new measurement of the ratio of the branching fractions R ( D * ) = B ( B ¯ → D * τ - ν ¯ τ ) / B ( B ¯ → D * ℓ - ν ¯ ℓ ) , where ℓ - denotes an electron or a muon, and the τ is reconstructed in the modes τ - → π - ν τ and τ - → ρ - ν τ . We use the full data sample of 772 × 1 0 6 B B ¯ pairs recorded with the Belle detector at the KEKB electron-positron collider. Our findings, P τ ( D * ) = - 0.38 ± 0.51 ( stat ) - 0.16 + 0.21 ( syst ) and R ( D * ) = 0.270 ± 0.035 ( stat ) - 0.025 + 0.028 ( syst ) , are consistent with the theoretical predictions of the standard model.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Lepton-Flavor-Dependent Angular Analysis of B → K * ℓ + ℓ -
Here, we present a measurement of angular observables and a test of lepton flavor universality in the B → K * ℓ + ℓ - decay, where ℓ is either e or μ . The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb - 1 containing 772 × 1 0 6 B B ¯ pairs, collected at the Υ ( 4 S ) resonance with the Belle detector at the asymmetric-energy e + e - collider KEKB. The finding is consistent with standard model (SM) expectations, where the largest discrepancy from a SM prediction is observed in the muon modes with a local significance of 2.6 σ .
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Search for D 0 decays to invisible final states at Belle
Here, we report the result from the first search for D 0 decays to invisible final states. The analysis is performed on a data sample of 924 fb - 1 collected at and near the Υ ( 4 S ) and Υ ( 5 S ) resonances with the Belle detector at the KEKB asymmetric-energy e + e - collider. The absolute branching fraction is confirmed using an inclusive D 0 sample, obtained by fully reconstructing the rest of the particle system including the other charmed particle. No significant signal yield is observed and an upper limit of 9.4 × 10 - 5 is set on the branching fraction of D 0 to invisible final states at 90% confidence level.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Search for the 0 - - glueball in Υ ( 1 S ) and Υ ( 2 S ) decays
Here, we report the first search for the J P C = 0 - - glueball in Υ ( 1 S ) and Υ ( 2 S ) decays with data samples of ( 102 ± 2 ) × 1 0 6 and ( 158 ± 4 ) × 1 0 6 events, respectively, collected with the Belle detector. No significant signals are observed in any of the proposed production modes, and the 90% credibility level upper limits on their branching fractions in Υ ( 1 S ) and Υ ( 2 S ) decays are gained. The inclusive branching fractions of the Υ ( 1 S ) and Υ ( 2 S ) decays into final states with a χ c 1 are measured to be B ( Υ ( 1 S ) → χ c 1 + anything ) = ( 1.90 ± 0.43 ( stat ) ± 0.14 ( syst ) ) × 10 - 4 with an improved precision over prior measurements and B ( Υ ( 2 S ) → χ c 1 + anything ) = ( 2.24 ± 0.44 ( stat ) ± 0.20 ( syst ) ) × 10 - 4 for the first time.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the branching ratio of B ¯ 0 → D * + τ - ν ¯ τ relative to B ¯ 0 → D * + ℓ - ν ¯ ℓ decays with a semileptonic tagging method
Here, we report a measurement of the ratio R ( D * ) = B ( B ¯ 0 → D * + τ - ν ¯ τ ) / B ( B ¯ 0 → D * + ℓ - ν ¯ ℓ ) , where ℓ denotes an electron or a muon. The results are based on a data sample containing 772 × 1 0 6 B B ¯ pairs recorded at the Υ ( 4 S ) resonance with the Belle detector at the KEKB e + e - collider. We select a sample of B 0 B ¯ 0 pairs by reconstructing both B mesons in semileptonic decays to D * ∓ ℓ ± . We measure R ( D * ) = 0.302 ± 0.030 ( stat ) ± 0.011 ( syst ) , which is within 1.6 σ of the Standard Model theoretical expectation, where the standard deviation σ includes systematic uncertainties. We use this measurement to constrain several scenarios of new physics in a model-independent technique.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
First observation of γ γ → p p ¯ K + K - and search for exotic baryons in p K systems
The process γ γ → p p ¯ K + K - and its intermediate processes are measured for the first time using a 980 fb - 1 data sample collected with the Belle detector at the KEKB asymmetric-energy e + e - collider. The production of p p ¯ K + K - and a Λ ( 1520 ) 0 ( Λ ¯ ( 1520 ) 0 ) signal in the p K - ( p ¯ K + ) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540 MeV / c 2 , denoted as Θ ( 1540 ) 0 ( Θ ¯ ( 1540 ) 0 ) or Θ ( 1540 ) + + ( Θ ( 1540 ) - -- ), is seen in the p K - ( p ¯ K + ) or p K + ( p ¯ K - ) invariant mass spectra. Cross sections for γ γ → p p ¯ K + K - , Λ ( 1520 ) 0 p ¯ K + + c . c . and the products σ ( γ γ → Θ ( 1540 ) 0 p ¯ K + + c . c . ) B ( Θ ( 1540 ) 0 → p K - ) and σ ( γ γ → Θ ( 1540 ) + + p ¯ K - + c . c . ) B ( Θ ( 1540 ) + + → p K + ) are measured. We also determine upper limits on the products of the χ c 0 and χ c 2 two-photon decay widths and their branching fractions to p p ¯ K + K - at the 90% credibility level.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Study of B 0 → ρ + ρ – decays and implications for the CKM angle Φ 2
We present a measurement of the branching fraction and the longitudinal polarization fraction of B 0 → ρ + ρ – decays, as well as the time-dependent CP violating parameters in decays into longitudinally polarized ρ + ρ – pairs with Belle’s final data set of 772 × 10 6 BB¯ pairs, at the Υ(4S) resonance, collected at the asymmetric-energy e + e – collider KEKB. We obtain B(B 0 → ρ + ρ – ) = (28.3 ± 1.5(stat) ± 1.5(syst)) × 10 –6 , f L = 0.988 ± 0.012(stat) ± 0.023(syst), A CP = 0.00 ± 0.10(stat) ± 0.06(syst), S CP = –0.13 ± 0.15(stat) ± 0.05(syst). As a result, we perform an isospin analysis to constrain the Cabibbo-Kobayashi-Maskawa angle Φ 2 and obtain two solutions with Φ 2 = (93.7 ± 10.6)°, being most compatible with other Standard-Model based fits to the data.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurements of the Υ ( 10860 ) and Υ ( 11020 ) resonances via σ ( e + e - → Υ ( n S ) π + π - )
In this work, we report new measurements of the total cross sections for e + e - → Υ ( n S ) π + π - ( n = 1 , 2, 3) and e + e - → b b ¯ from a high-luminosity fine scan of the region s = 10.63 – 11.05 GeV with the Belle detector. We observe that the Υ ( n S ) π + π - spectra have little or no nonresonant component and extract from them the masses and widths of Υ ( 10860 ) and Υ ( 11020 ) and their relative phase. We find M 10860 = ( 10891.1 ± 3. 2 - 1.7 + 0.6 ) MeV / c 2 and Γ 10860 = ( 53. 7 - 5.6 - 5.4 + 7.1 + 1.3 ) MeV and report first measurements M 11020 = ( 10987. 5 - 2.5 - 2.1 + 6.4 + 9.0 ) MeV / c 2 , Γ 11020 = ( 6 1 - 19 - 20 + 9 + 2 ) MeV , and Φ 11020 - Φ 10860 = ( - 1.0 ± 0.4 - 0.1 + 1.4 ) rad .
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the branching ratio of B ¯ → D ( * ) τ - ν ¯ τ relative to B ¯ → D ( * ) ℓ - ν ¯ ℓ decays with hadronic tagging at Belle
In this article 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 × 10 6 B B ¯ pairs collected at the Υ ( 4 S ) 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 consistent with earlier measurements and do not show a significant deviation from the standard model prediction.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
First Observation of C P Violation in B ¯ 0 → D C P ( * ) h 0 Decays by a Combined Time-Dependent Analysis of BABAR and Belle Data
We report a measurement of the time-dependent CP asymmetry of B¯ 0 → D$^{(*)}_{CP}$h 0 decays, where the light neutral hadron h 0 is a π 0 , η, or ω meson, and the neutral D meson is reconstructed in the CP eigenstates K + K – , K$^{0}_{S}$π 0 , or K$^{0}_{S}$ω. The measurement is performed combining the final data samples collected at the Υ(4S) resonance by the BABAR and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471 ± 3) × 10 6 BB¯ pairs recorded by the BABAR detector and (772 ± 11) × 10 6 BB¯ pairs recorded by the Belle detector. We measure the CP asymmetry parameters –ηfS = +0.66 ± 0.10(stat) ± 0.06(syst) and C = –0.02 ± 0.07(stat) ± 0.03(syst). Here, these results correspond to the first observation of CP violation in B¯ 0 → D$^{(*)}_{CP}$h 0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Organ Impairment-Drug-Drug Interaction Database: A Tool for Evaluating the Impact of Renal or Hepatic Impairment and Pharmacologic Inhibition on the Systemic Exposure of Drugs: Organ Impairment-Drug-Drug Interaction Database
The organ impairment and drug–drug interaction (OI-DDI) database is the first rigorously assembled database of pharmacokinetic drug exposure data from publicly available renal and hepatic impairment studies presented together with the maximum change in drug exposure from drug interaction inhibition studies. The database was used to conduct a systematic comparison of the effect of renal/hepatic impairment and pharmacologic inhibition on drug exposure. Additional applications are feasible with the public availability of this database
59 BASIC BIOLOGICAL SCIENCES↗
Measurement of e + e - → π + π - ψ ( 2 S ) via initial state radiation at Belle
We report here measurement of the cross section of e + e - → π + π - ψ ( 2 S ) between 4.0 and 5.5 GeV, based on an analysis of initial state radiation events in a 980 fb - 1 data sample recorded with the Belle detector. The properties of the Y ( 4360 ) and Y ( 4660 ) states are determined. Fitting the mass spectrum of π + π - ψ ( 2 S ) with two coherent Breit-Wigner functions, we discover two solutions with identical mass and width but different couplings to electron-positron pairs: M Y ( 4360 ) = ( 4347 ± 6 ± 3 ) MeV / c 2 , Γ Y ( 4360 ) = ( 103 ± 9 ± 5 ) MeV , M Y ( 4660 ) = ( 4652 ± 10 ± 8 ) MeV / c 2 , Γ Y ( 4660 ) = ( 68 ± 11 ± 1 ) MeV ; and B [ Y ( 4360 ) → π + π - ψ ( 2 S ) ] · Γ Y ( 4360 ) e + e - = ( 10.9 ± 0.6 ± 0.7 ) eV and B [ Y ( 4660 ) → π + π - ψ ( 2 S ) ] · Γ Y ( 4660 ) e + e - = ( 8.1 ± 1.1 ± 0.5 ) eV for one solution; or B [ Y ( 4360 ) → π + π - ψ ( 2 S ) ] · Γ Y ( 4360 ) e + e - = ( 9.2 ± 0.6 ± 0.6 ) eV and B [ Y ( 4660 ) → π + π = ψ ( 2 S ) ] · Γ Y ( 4660 ) e + e - = ( 2.0 ± 0.3 ± 0.2 ) eV for the other. Here, the first errors are statistical and the second systematic. Evidence for a charged charmoniumlike structure at 4.05 GeV / c 2 is observed in the π ± ψ ( 2 S ) intermediate state in the Y ( 4360 ) decays. decays.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗