The European Physical Journal C

http://link.springer.com/journal/10052

List of Papers (Total 3,622)

Measurements of charged kaon semileptonic decay branching fractions K±→π0μ±ν and K±→π0e±ν and their ratio

In an earlier paper [1], the background for Ke3 was over estimated due to an erroneous calculation of the electron identification efficiency. The correct ratios of the partial widths involving this channel are \(\mathcal{R}_{K e 3 / K2\pi} = 0.2470\pm0.0009\, ({\text{stat}})\pm0.0004\, ({\text{syst}})\) and \(\mathcal{R}_{K \mu3 / Ke3} = 0.663\pm0.003\,({\text{stat}})\pm0.001...

Study of J/ψ decaying into ωpp̄

The decay J/ψ→ωpp̄ is studied using a 5.8×107 J/ψ event sample accumulated with the BES II detector at the Beijing Electron–Positron Collider. The decay branching fraction is measured to be B(J/ψ→ωpp̄)=(9.8±0.3±1.4)×10-4. No significant enhancement near the pp̄ mass threshold is observed, and an upper limit of B(J/ψ→ωX(1860))B(X(1860)→pp̄)<1.5×10-5 is determined at the 95...

Measurement of αs with radiative hadronic events

Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z boson with the OPAL detector at LEP. The strong coupling αs is extracted by comparing data and QCD predictions for event shape observables at average reduced centre-of-mass energies ranging from 24 GeV to 78 GeV, and the energy dependence of αs is...

Annihilation-in-flight of polarised positrons with polarised electrons as an analyser of the positron polarisation from muon decay

The use of annihilation-in-flight of arbitrarily polarised positrons with arbitrarily polarised electrons as an analyser for the positron polarisation from muon decay is discussed. Analysing powers for the longitudinal and the two transverse positron polarisation components are derived and algorithms for the simulation of polarised muon decay and of annihilation-in-flight are given.

The reaction np→ppπ- from threshold up to 570 MeV

Due to a coding error, the previous paper quoted incorrect values for the differential cross sections dσ/dMpp and dσ/dΩπ * of the process np→ppπ-.

Perturbative and non-perturbative QCD corrections to wide-angle Compton scattering

The paper contains a sign mistake. In Eqs. (1), (25), (30) and (38) the form factor R T and the ratio \(\kappa\) are to be replaced by -R T and \(-\kappa\), respectively. The predictions for A LL = K LL shown in Fig. 7, are nearly independent of this change while those for A LS = - K LS are substantially smaller in absolute value than the results shown in Fig. 8. All other...

Generalized parton distributions in impact parameter space

The kinematical factor in the positivity bound (36) is incorrect. The bound correctly reads \(\begin{array}{lll} &&(1-\xi^2)^3\, \Big|\, {\cal I}_{\lambda'\lambda}(x,\xi,\vec{b}) \,\Big|^2 \\ && \le {\cal I}_{++}\Big(\frac{x-\xi}{1-\xi},0, \frac{\vec{b}}{1-\xi}\Big)\; {\cal I}_{++}\Big(\frac{x+\xi}{1+\xi},0, \frac{\vec{b}}{1+\xi}\Big) . \end{array}\) Our corrected result agrees...