50,239 research outputs found
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Bulletin: Number 623: Experiments with Commercial Nitrogenous Fertilizers on Apple Orchards
No full text36 pages, 1 article*Experiments with Commercial Nitrogenous Fertilizers on Apple Orchards* (Harlan, J. D.; Collison, R. C.) 34 page
Bulletin: Number 562: High-Nicotine Tobacco
No full text19 pages, 1 article*High-Nicotine Tobacco* (Collison, R. C.; Harlan, J. D.; Streeter, L. R.) 17 page
Bulletin: Number 647: Winter Injury of Baldwin Apple Trees and its Relation to Previous Tree Performance and Nutritional Treatment
No full text13 pages, 1 article*Winter Injury of Baldwin Apple Trees and its Relation to Previous Tree Performance and Nutritional Treatment* (Collison, R. C.; Harlan, J. D.) 11 page
Bulletin: Number 629: Some Facts About Soil Management in a New York Orchard
No full text20 pages, 1 article*Some Facts About Soil Management in a New York Orchard* (Collison, R. C.; Harlan, J. D.) 18 page
Bulletin: Number 503: Final Report on the Cooperative Experiments in Orchard Fertilization
No full text30 pages, 1 article*Final Report on the Cooperative Experiments in Orchard Fertilization* (Collison, R. C.; Harlan, J. D.) 29 page
Bulletin: Volume 646: Fertilizer Responses of Baldwin Apple Trees on an Acid Soil
No full text24 pages, 1 article*Fertilizer Responses of Baldwin Apple Trees on an Acid Soil* (Collison, R. C.; Harlan, J. D.) 22 page
Measurement of the B0–B0 oscillation frequency Δmd with the decays B0→D−π+ and B0→ J/ψK∗0
No full textThe B
0
–B
0
oscillation frequency Δmd is measured by the LHCb experiment using a dataset corresponding
to an integrated luminosity of 1.0 fb−1
of proton–proton collisions at √
s = 7 TeV, and is found to be
Δmd
=0.5156±0.0051 (stat.)±0.0033 (syst.) ps−1
. The measurement is based on results from analyses
of the decays B
0
→ D
−π
+ (D
−
→ K
+π
−π
−) and B
0
→ J/ψK
∗0
(J/ψ →μ
+μ
−,K
∗0
→ K
+π
−) and
their charge conjugated modes
Search for the rare decays J/y -> D-s(-) rho(+) and J/psi -> <(D)over bar(0)<(K)over bar*(0)
No full textA search for the rare decays of J/psi -> D-S(-) rho(+) + c.c. and J/psi -> D-S(-)rho(+) + c.c.) <1.3 x 10(-5) and beta(J/psi -
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
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