Search results for "Angular Distribution"
showing 10 items of 89 documents
Study ofψdecays to theΞ−Ξ¯+andΣ(1385)∓Σ¯(1385)±final states
2016
We study the decays of the charmonium resonances J/psi and psi(3686) to the final states Xi(-)(Xi) over bar (+), S(1385)(-/+)(Sigma) over bar (1385)(+/-) based on a single baryon tag method using data samples of (223.7 +/- 1.4) x 10(6) J/psi and (106.4 +/- 0.9) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider. The decay psi(3686) -> Sigma(1385)(-/+)(Sigma) over bar (1385)(+/-) is observed for the first time, and the measurements of the other processes, including the branching fractions and angular distributions, are in good agreement with, and much more precise than, the previously published results. Additionally, the ratios B(psi(3686)->Xi(-)(Xi) over bar …
First observation of the rareB+→D+K+π−decay
2016
The B+→D+K+π- decay is observed in a data sample corresponding to 3.0 fb-1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. The signal significance is 8σ and the branching fraction is measured to be B(B+→D+K+π-)=(5.31±0.90±0.48±0.35)×10-6, where the uncertainties are statistical, systematic and due to the normalization mode B+→D-K+π+, respectively. The Dalitz plot appears to be dominated by broad structures. Angular distributions are exploited to search for quasi-two-body contributions from B+→D2∗(2460)0K+ and B+→D+K∗(892)0 decays. No significant signals are observed and upper limits are set on their branching fractions.
Energy- and angle-resolved electron distribution in the photodetachment ofF−
2009
We report calculations of energy- and angle-resolved photoelectron distribution of ${\text{F}}^{\ensuremath{-}}$ irradiated by a linearly strong short infrared pulse, performed by evaluating the photoelectron ejection probability in the framework of a modified Keldysh theory, taking into account the temporal behavior of the pulse and the spatial inhomogeneity of the laser intensity. Results of the calculations are compared with the measurements of the photoelectron angular distribution recently appearing in the literature. The oscillations found in the experimental data are explained in terms of quantum interference effects.
Polarization and angular distribution of the radiation emitted in laser-assisted recombination
2007
The effect of an intense external linear polarized radiation field on the angular distributions and polarization states of the photons emitted during the radiative recombination is investigated. It is predicted, on symmetry grounds, and corroborated by numerical calculations of approximate recombination rates, that emission of elliptically polarized photons occurs when the momentum of the electron beam is not aligned to the direction of the oscillating field. Moreover, strong modifications to the angular distributions of the emitted photons are induced by the external radiation field.
Herstellung und Nachweis polarisierter Elektronenstrahlen durch zweimalige Streuung von Gl�helektronen kleiner Energie (1?2 keV) an Hg-Atomstrahlen
1961
Beams of electrons of low energy (1 to 2 keV) are elastically scattered twice by atomic beams of mercury. A maximum intensity asymmetry of 200δ=31±5 was observed for double 90° scattering of 1500 eV electrons.
Precision measurement of the ratio BR(KS→π+π−e+e−)/BR(KL→π+π−πD0)
2011
Abstract The K S → π + π − e + e − decay mode was investigated using the data collected in 2002 by the NA48/1 Collaboration. With about 23 k K S → π + π − e + e − events and 59 k K L → π + π − π D 0 normalization decays, the K S → π + π − e + e − branching ratio relative to the K L → π + π − π D 0 one was determined to be BR ( K S → π + π − e + e − ) / BR ( K L → π + π − π D 0 ) = ( 3.28 ± 0.06 stat ± 0.04 syst ) × 10 − 2 . This result was used to set the upper limit | g E1 / g BR | 3.0 at 90% CL on the presence, in the decay amplitude, of an E1 direct emission ( g E1 ) term relative to the dominant inner bremsstrahlung ( g BR ) term. The CP-violating asymmetry A ϕ in the sin ϕ cos ϕ distri…
Continuum excitations in6He
1999
T. Aumann et al. ; 11 pags.; 6 figs.; 2 tabs. ; PACS number(s): 27.20.1n, 25.60.Gc, 25.70.De, 29.30.Hs
Messung der ?-?-zirkularen Polarisationskorrelation von Antimon I24
1961
Beim einfach verbotenen 3−−2+-Betaubergang von Antimon 124 wurde die Winkelund Energieabhangigkeit derβ-γ-zirkularen Polarisationskorrelation gemessen. Der Nachweis der Zirkularpolarisation geschah mit Hilfe von Compton-Streuung an polarisierten Elektronen in magnetisiertem Eisen. Aus diesen Messungen kann man unter Zuhilfenahme von Ergebnissen der Richtungskorrelation die Matrixelemente dieses Uberganges eindeutig bestimmen. Die Auswertung ergab, das hauptsachlich dieBij Matrixelemente beitragen. Dies kann durch den „Selectionrule-effect“ verstandlich gemacht werden.
Corrigendum to “Odd and even partial waves of ηπ− and η′π− in π−p → η(′)π−p at 191 GeV/c” [Phys. Lett. B 740 (2015) 303–311]
2020
Abstract In Fig. 5 on p. 311 of our Phys. Lett. B 740 (2015) 303 an adjustment by 180 ∘ is required for the phases with respect to the L = 2 , M = 1 wave, of the following waves: L = 1 , 3 , 5 with M = 1 , and L = 2 with M = 2 . After this correction (Fig. 5 (corrected) below), the extracted partial waves describe the angular distribution of the η ( ′ ) in the Gottfried-Jackson (GJ) frame, using Eq. (4) with implicit Condon-Shortley phase convention. The other results of our paper are not affected. The right-handed GJ coordinate system was defined by the z-axis pointing in the direction of the beam in the η ( ′ ) π − center-of-mass system and the y-axis pointing in the direction of p recoil…
Die Winkelverteilung im Bereich 30 bis 155� von elastisch an Golddampf gestreuten Elektronen mit Energien zwischen 150 und 1900 eV
1963
The angular distribution of electrons scattered elastically by gold atoms has been investigated over the angular range from 30 to 155° and with electron energies between 150 and 1900 eV. The scattering curves obtained resemble closely the corresponding curves for mercury atoms. The theoretically expected energy dependence of the 90°-scattering is in poor agreement only with the results obtained experimentally in this work.