Showing papers by "Université Paris-Saclay published in 1977"
TL;DR: In this paper, the authors present measurements of anomalous muon production in three energy ranges, including two-prong and multiprong muon annihilations, and show that the anomalous production must come in part from a source other than a heavy lepton.
Abstract: We present measurements of inclusive anomalous muon production in ${e}^{+}{e}^{\ensuremath{-}}$ annihilations in three energy ranges. In all three ranges we observe a large anomalous muon production rate in two-prong events which is compatible with the expected decays of pairs of heavy leptons. In the highest energy range there is also appreciable anomalous muon production in multiprong events which, due to its magnitude and momentum dependence, must come in part from a source other than a heavy lepton.
60 citations
TL;DR: In this paper, branching ratios for several mesonic decay modes of the psi (3095) were presented for two-body and quasi-two-body final states with branching ratios that follow the general pattern of behavior expected for the decay of an SU(3) singlet via an SU-(3) -symmetric interaction.
Abstract: We present branching ratios for several mesonic decay modes of the psi (3095). The two-body and quasi-two-body final states have branching ratios that follow the general pattern of behavior expected for the decay of an SU(3) singlet via an SU(3) -symmetric interaction. The ..pi../sup +/..pi../sup -/ and K/sup +/K/sup -/ mass spectra in ..omega pi pi.., ..omega..KK, phi..pi pi.., and phiKK final states show remarkable differences that are most readily interpretable in terms of the Okubo-Zweig-Iizuka rule.
12 citations
TL;DR: In this paper, the difference in angular distributions between the 2/sup +/state and the ground state can be well described using coupled-channel Born approximation calculations that take into account the important indirect processes.
Abstract: The /sup 64/Ni(/sup 16/O, /sup 14/C)/sup 66/Zn and /sup 100/Mo(/sup 12/C, /sup 10/Be)/sup 102/Ru angular distributions have been measured between 13degree and 70degree lab respectively at 56 and 48 MeV incident energies. Distorted-wave Born approximation and coupled-channel Born approximation analyses have been performed using exact finite range codes. The marked difference in the angular distributions between the /sup 102/Ru ground state and 2/sup +/ state can be well described using coupled-channel Born approximation calculations that take into account the important indirect processes. Furthermore, the relative intensities among various states are better reproduced by coupled-channel Born approximation calculations than by distorted-wave Born approximation calculations. (AIP)
4 citations
TL;DR: The role of multistep processes has also been investigated by performing exact finite-range coupled-channel Born approximation calculations which take into account the core excitation of the projectile or the target nucleus.
Abstract: The (/sup 16/O,/sup 15/N) and (/sup 12/C,/sup 11/B) reactions on /sup 62/Ni target have been investigated with 56 MeV /sup 16/O and 48 MeV /sup 12/C beams. Angular distributions for transitions to the first five single particle states of /sup 63/Cu were obtained. An exact finite-range distorted-wave Born approximation analysis was performed, showing that the spectroscopic factors extracted agree fairly well with those obtained from light ion induced reactions. The role of multistep processes has also been investigated by performing exact finite-range coupled-channel Born approximation calculations which take into account the core excitation of the projectile or the target nucleus. It is found that in the case of the /sup 62/Ni(/sup 12/C,/sup 11/B)/sup 63/Cu reaction both the intensity and shape of the angular distributions are affected by including the multistep contributions due to projectile excitation. In particular, the behavior of the angular distributions at small angles is better described by the coupled-channel Born approximation calculations. The indirect routes involving the inelastic excitations of the /sup 16/O or /sup 62/Ni nuclei are shown to be unimportant.
3 citations