We have measured the branching fraction and photon energy spectrum for the radiative penguin process b-->s gamma. We find Beta(b-->s gamma) = (3.21+/-0.43+/-0.27(+0.18)(-0.10))x10(-4), where the ...errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, <E( gamma)> = 2.346+/-0.032+/-0.011 GeV, and <E(2)(gamma)>-<E(gamma)>(2) = 0.0226+/-0.0066+/-0.0020 GeV(2), where the errors are statistical and systematic. From the first moment, we obtain (in the modified minimal subtraction renormalization scheme, to order 1/M(3)(B) and beta(0)alpha(2)(s)) the heavy quark effective theory parameter Lambda = 0.35+/-0.08+/-0.10 GeV.
First measurement of gamma(D(+)) Ahmed, S; Alam, M S; Athar, S B ...
Physical review letters,
12/2001, Letnik:
87, Številka:
25
Journal Article
Recenzirano
Odprti dostop
We present the first measurement of the D*(+) width using 9/fb of e(+)e(-) data collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a ...reconstruction method that takes advantage of the small vertical size of the Cornell Electron-positron Storage Ring beam spot to measure the energy release distribution from the D*(+)-->D(0)pi(+) decay. We find gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV. We also measure the energy release in the decay and compute Delta m identical with m(D*(+))-m(D(0)) = 145.412+/-0.002 (stat)+/-0.012 (syst) MeV/c(2).
Using 13.7 fb(-1) of data recorded by the CLEO detector at the Cornell Electron Storage Ring, we investigate the spectrum of charmed baryons which decay into Lambda+(c)pi(-)pi(+) and are more massive ...than the Lambda+(c)(2625) baryon. We find evidence for two new states: one is broad and has an invariant mass roughly 480 MeV above that of the Lambda+(c) baryon; the other is narrow with an invariant mass of 596+/-1+/-2 MeV above the Lambda+(c) mass.
We report results of searches for charmless hadronic B meson decays to pseudoscalar( pi(+/-), K+/-, pi(0), or K(0)(S))-vector( rho, K(*), or omega) final states. By using 9.7x10(6) BB pairs collected ...with the CLEO detector, we report the first observation of B(-)--->pi(-)rho(0), B(0)-->pi(+/-)rho(-/+), and B(-)-->pi(-)omega, which are expected to be dominated by hadronic b-->u transitions. The measured branching fractions are (10.4(+3.3)(-3.4)+/-2.1)x10(-6), (27.6(+8.4)(-7.4)+/-4.2)x10(-6), and (11.3(+3.3)(-2.9)+/-1. 4)x10(-6), respectively. Branching fraction upper limits are set for all of the other decay modes investigated.
We have measured the first and second moments of the hadronic mass-squared distribution in B-->X(c)l nu, for P(lepton)>1.5 GeV/c. We find <M(2)(X)-M macro(2)(D)> = 0.251+/-0.066 GeV(2), ...<(M(2)(X)-<M(2)(X)>)(2)> = 0.576+/-0.170 GeV(4), where M macro(D) is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b-->s gamma, we find the heavy quark effective theory parameter lambda(1) (in the modified minimal subtraction renormalization scheme, to order 1/M(3)(B) and beta(0)alpha(2)(s)) to be -0.24+/-0.11 GeV(2). Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain absolute value of V(cb) = 0.0404+/-0.0013.
An experimental K-shell photodetachment study of Li(-) giving rise to doubly photoionized Li(+) ions has been carried out at the Advanced Light Source, using a collinear photon-ion beam apparatus. ...The experiment reveals dramatic structure, differing substantially both qualitatively and quantitatively from the corresponding processes above the 1s ionization threshold in Li and Li(+), as predicted by our enhanced R-matrix calculation. The experimental/theoretical comparison shows good agreement over some of the photon energy range, and also reveals some puzzling discrepancies.
Conocer la prevalencia de los resultados negativos asociados con la medicación (RNM) entre los usuarios del servicio de urgencias. Caracterizarlos por su gravedad, evitabilidad y coste, así como ...encontrar factores asociados con su aparición.
Estudio observacional, descriptivo y transversal en el servicio de urgencias de un hospital de tercer nivel. Como fuentes de información se emplearon la entrevista a los pacientes y la historia de urgencias. Se trabajó según el método Dáder y las directrices del Tercer Consenso de Granada. Se empleó el test de la χ2 de Pearson para buscar la asociación entre edad, sexo o número de medicamentos y presentar los RNM. La evitabilidad se estableció según el criterio de Baena et al y la gravedad por el ingreso o no del paciente en boxes de observación o planta de hospitalización.
El 24,4% de los pacientes acudió a urgencias a causa de un RNM. El 16,1% necesitó hospitalización para resolver el problema de salud. El 83,9% de todos los RNM y el 77,3% de los ingresos causados por RNM fueron evitables. Se encontró estadísticamente más prevalencia de RNM entre los pacientes que tomaban 5 o más medicamentos. Se estimó un gasto de 14.666.178 € en el tratamiento de los RNM evitables del año 2003.
La prevalencia de RNM en la población atendida, su elevado porcentaje de evitabilidad y el coste que suponen para el servicio de salud parecen argumentos suficientes para considerar los RNM como un problema para el cual es necesario establecer programas de prevención basados en el seguimiento farmacoterapéutico.
To find out the prevalence of negative results associated with medication (herein referred to as NRM) in patients attending the emergency department. To classify the results by severity, avoidability and cost, as well as to establish the factors associated with their appearance.
Observational, descriptive and cross-sectional study carried out in the emergency department of a tertiary hospital. Patient surveys and emergency department records were used as sources of information. The Dader Method and guidelines from the Third Consensus of Granada were used. Pearson's χ2 test was used to find the association between age, gender and number of drugs and showing signs of NRM. Avoidability was measured using Baena et al's criteria and severity was assessed according to whether or not the patient had been admitted into an observation stall or on to a hospital ward.
24.4% of patients visited the emergency department because of NRM. 16.1% needed to be hospitalised to solve their health issue. 83.9% of all patients with NRM and 77.3% of those hospitalized due to NRM could have been avoided. Statistically, there was a higher prevalence of NRM in patients taking 5 or more different drugs. An estimated € 14,666,178 was spent on treating avoidable NRM cases in 2003.
The prevalence of NRM in those who attended the emergency department, the high percentage of avoidability and the cost imposed on the Health Service seem to sufficiently argue a case for the consideration that NRM as a problem which requires the implementation of prevention programmes based on drug-treatment monitoring.
Using 13.7 fb(-1) of data recorded by the CLEO detector at Cornell Electron Storage Ring, we report evidence of two new charmed baryons: one decaying into Xi(0')(c)pi(+) with the subsequent decay ...Xi(0')(c)-->Xi(0)(c)gamma, and its isospin partner decaying into Xi(+')(c)pi(-) followed by Xi(+')(c)-->Xi(+)(c)gamma. We measure the following mass differences for the two states: M(Xi(0)(c)gammapi(+))-M(Xi(0)(c)) = 318.2+/-1.3+/-2.9 MeV and M(Xi(+)(c)gammapi(-))-M(Xi(+)(c)) = 324.0+/-1.3+/-3.0 MeV. We interpret these new states as the J(P) = 1 / 2(-) Xi(c1) particles, the charmed-strange analogs of the Lambda(+)(c1)(2593).