6,758 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)
Broadband dielectric spectroscopy of standard and core-shell BaTiO3-NiO ceramic composites compared to the BaTiO3 ceramics
No full textThis work was supported by the Czech Science Foundation (Project No. 15-08389S).Nuzhnyy, D., Petzelt, J., Bovtun, V., Ostapchuk, T., Savinov, M., Kempa, M., Bednyakov, P., Fernández-Garciá, L., Rodriguez-Suarez, T., Menendéz, J.L
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Measurement of the CP-violating phase \phi s in Bs->J/\psi\pi+\pi- decays
No full textMeasurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/\psi pi+ pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of phi_s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
No full textThis Letter reports a measurement of the CP violation observables SJ/ψK0S and CJ/ψK0S in the decay channel B0→J/ψK0S performed with 1.0 fb−1 of pp collisions at s√=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψK0S=0.73±0.07(stat)±0.04(syst) and CJ/ψK0S=0.03±0.09(stat)±0.01(syst). Both values are consistent with the current world averages and within
expectations from the Standard Model
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
No full textFirst observations of the B0s
→ψ(2S)η, B0 →ψ(2S)π
+
π
− and B0s
→ψ(2S)π
+
π
− decays are made
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
√
s = 7 TeV. The ratios of the branching fractions
of each of the ψ(2S) modes with respect to the corresponding J/ψ decays are
B(B0s
→ψ(2S)η)
÷
B(B0s
→J/ψη)
= 0.83± 0.14 (stat)±0.12 (syst) ±0.02 (B),
;
B(B0→ψ(2S)π
+
π
−
)
÷
B(B0→J/ψπ
+
π
−
)
= 0.56± 0.07 (stat)±0.05 (syst)± 0.01 (B),
;
B(B0s
→ψ(2S)π
+
π
−
)
÷
B(B0s
→J/ψπ
+
π
−
)
= 0.34± 0.04 (stat)±0.03 (syst)± 0.01 (B),
where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the J/ψ
and ψ(2S) meson decays
Transcriptome Responses to Combinations of Stresses in Arabidopsis
No full textIn Arabidopsis, the response of the majority of the genes cannot be predicted from single stress experiments and only a small fraction of the genes have potential antagonistic responses, indicating that plants have evolved to cope with combinations of stresses and therefore may be bred to endure them
Measurement of the branching fraction
No full textThe B
0
s
→ J/ψK
0
S
branching fraction is measured in a data sample corresponding to 0.41 fb−1
of integrated luminosity collected with the LHCb detector at the LHC. This channel is sensitive to
the penguin contributions affecting the sin 2β measurement from B
0
→ J/ψK
0
S
. The time-integrated
branching fraction is measured to be B(B
0
s
→ J/ψK
0
S
) = (1.83±0.28)×10−5
. This is the most precise
measurement to date
The Intercalation Of Some Heterocyclic Amines Into α-titanium Hydrogenphosphate - Structural And Calorimetric Data
No full textThe intercalation of the heterocyclic amines 2,6-lutidine, pyrazine, piperazine and piperidine into α-titanium hydrogenphosphate gave the maximum amounts intercalated in aqueous solutions of 0.4 ,0.65, 2.77, and 6.52 mmol g-1, respectively, through a batch method at 298 ± 1 K. The original interlamellar distance of 760 pm increased after intercalation of piperazine and piperidine molecules, while for 2,6-lutidine and pyrazine molecules no change was observed. These results suggested that the amines were bonded only on the surface of the host. All thermochemical data were obtained on a differential isothermic microcalorimetric instrument by means of a titration procedure. From thermal effect data, the variation in enthalpy for each system gave exothermic values of - 6.56 ± 0.10, - 1.00 ± 0.10, - 10.10 ± 0.34, and -31.4.4 ± 0.71 kJ mol-1 for intercalations of the above sequence of heterocyclic amines. The infrared spectra are in agreement with acid-base reactions, involving the layered acid hos O3P-OH of the inorganic matrix and the basic center atoms of the guest molecules. (C) 2000 Academic Press.1542557563Atwood, J.L., Davies, J.E.D., MacNicol, D.D., (1991) Inclusion Compounds, , Chapter 5. Oxford Univ. Press, New YorkMuller-Warmuth, W., Schollhorn, R., (1994) Progress in Intercalation Research, pp. 223-271. , Kluwer, DordrechtKakiguchi, K., Baba, Y., Yanagida, T., Danjo, M., Tsuhako, M., Nariai, H., Yamaguchi, S., Motooka, I., (1995) Phosphorus Res. Bull., 5, p. 131Hasegawa, Y., Akimoto, T., Kojima, D., (1995) J. Inclusion Phenom. Mol. Recognit. Chem., 20, p. 1Clearfield, A., (1982) Inorganic Ion Exhange Materials, , CRC Press, Boca Raton, FLAlberti, G., Bein, T., (1996) Comprehensive Supramolecular Chemistry, 7. , 1st ed., Pergamon, OxfordOgawa, M., Kuroda, K., (1995) Chem. Rev., 95, p. 399Blumenfeld, A.L., Golub, A.S., Protsenko, G., Novikov, Y.N., Casciola, M., Costantino, U., (1994) Solid State Ionics, 68, p. 105Ruiz-Hitzky, E., (1993) Adv. Mater., 5, p. 334Menendez, F., Espina, A., Trobajo, C., Rodriguez, J., (1990) Mater. Res. Bull., 25, p. 1531Menendez, A., Barcena, M., Jaimez, E., Garcia, J.R., Rodriguez, J., (1993) Chem. Mater., 5, p. 1078Espina, A., Menendez, F., Jaimez, E., Khainakov, S.A., Trobajo, C., Garcia, J.R., Rodriguez, J., (1998) Chem. Mater., 10, p. 2490Barcina, L.M., Veja, A., Suarez, M., Llavona, R., Rodriguez, J., (1998) Solv. Extr. Ion Exchange, 16, p. 861Hix, B., Harris, K.D.M., (1997) Eur. J. Solid State Inorg. Chem., 34, p. 589Nunes, L.M., Airoldi, C., (1999) Mater. Res. Bull., 34, p. 2121Airoldi, C., Prandini, D.S., (1999) Thermochim. Acta, 328, p. 25Airoldi, C., Roca, S., (1996) J. Mater. Chem., 6, p. 1963Kijima, T., Goto, M., (1983) Thermochim. Acta, 63, p. 33Espina, A., Garcia, J.R., Guil, J.M., Jaimez, E., Parra, J.B., Rodriguez, J., (1998) J. Phys. Chem. B, 102, p. 1713Dekany, I., Szirtes, L., (1995) J. Radioanal. Nucl. Chem., 190, p. 167Nunes, L.M., Airoldi, C., (1999) Chem. Mater., 11, p. 2069Nunes, L.M., Airoldi, C., (1999) Thermochim. Acta, 328, p. 297Boulton, A.J., McKillop, A., (1984) Comprehensive Heterocyclic Chemistry, 3. , Pergamon, Elmsford, NYReal, L.M., Torno, R.P., Lara, M.M., Bruque, S., (1987) Mater. Res. Bull., 22, p. 19Casciola, M., Andersen, E.K., Andersen, J.G.K., (1990) Acta Chem. Scand., 44, p. 459Casciola, M., Chieli, S., Costantino, U., Peraio, A., (1991) Solid State Ionics, 46, p. 53Espina, A., Jaimez, E., Khainakov, S.A., Trobajo, C., Garcia, J.R., Rodriguez, J., (1998) J. Incl. Phenom., 102, p. 1713Danjo, M., Baba, Y., Tsumako, M., Nariai, H., Motooka, I., (1993) Phosphorus Res. Bull., 3, p. 25Dollish, F.R., Fately, W.G., Bentley, F.F., (1974) Characteristic Raman Frequencies of Organic Compounds, , Wiley, New YorkAiroldi, C., Alcantara, E.F.C., (1995) Thermochim. Acta, 259, p. 95Roca, S., Airoldi, C., (1997) J. Chem. Soc., Dalton Trans., p. 2517Vieira, E.F.S., Simoni, J.A., Airoldi, C., (1997) J. Mater. Chem., 7, p. 224
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
- …
