Measurement of the J/ψ radiative decay into f0(1270)γ

Radiative Decay of Υ into a

We study the radiative decay of Υ into a scalar glueball Υ → γGs using QCD factorization. We find that for this process the non-perturbative effects can be factorized into a matrix element defined in non-relativistic QCD which can be determined from leptonic decay of Υ, and into the gluon parton distribution amplitude, whose asymptotic form is known up to a normalization constant. Normalizing t...

Hyperon radiative decay.

Radiative Decay Engineering

Metallic surfaces can have unusual effects on fluorophores such as increasing or decreasing the rates of radiative decay and the rates of resonance energy transfer (RET). In the present article we describe the effects of metallic silver island films on the emission spectra, lifetimes, and energy transfer for several fluorophores. The fluorophores are not covalently coupled to the silver islands...

Observation of the Radiative Decay Dp1!D1g

J. Bartelt,1 S. E. Csorna,1 V. Jain,1,* K. W. McLean,1 S. Marka,1 R. Godang,2 K. Kinoshita,2 I. C. Lai,2 P. Pomianowski,2 S. Schrenk,21 G. Bonvicini,3 D. Cinabro,3 R. Greene,3 L. P. Perera,3 G. J. Zhou,3 B. Barish,4 M. Chadha,4 S. Chan,4 G. Eigen,4 J. S. Miller,4 C. O’Grady,4 M. Schmidtler,4 J. Urheim,4 A. J. Weinstein,4 F. Würthwein,4 D. W. Bliss,5 G. Masek,5 H. P. Paar,5 S. Prell,5 V. Sharma,...

Study of the Doubly Radiative Decay

We present .a study of the decay sequence J/w + yX, X-+ yp', p "-+ rr+rr-, _. based on 5.8 x lo6 produced J/i) collected by the Mark III detector at SPEAR. In the yp " mass spectrum, we find two peaks with masses and widths consistent with the axial vector mesons ji(1285) and ji(1420) that have recently been observed in two-photon collisions. Fits to the angular distributions confirm that the f...