Evidence for the production of b-flavoured baryons in Z 0 decays is reported from the analysis of... more Evidence for the production of b-flavoured baryons in Z 0 decays is reported from the analysis of 365 000 hadronic events collected by the DELPHI detector. Assuming that most of the weakly decaying b flavoured baryons produced by ...
We present the EROS nearby supernova (z ~ 0.02-0.2) search and the analysis of the first year of ... more We present the EROS nearby supernova (z ~ 0.02-0.2) search and the analysis of the first year of data (1997). A total of 80 square degrees were surveyed. Eight supernovae were detected, four of which were spectroscopically identified as type Ia supernovae. The search efficiency was determined with a Monte-Carlo simulation taking into account the efficiencies for both supernova detection and host galaxy identification. Assuming that for a given galaxy the supernova rate is proportional to the galactic luminosity, we compute a type Ia supernova explosion rate of: R = 0.44-0.21+0.35-0.07+0.13 h2 \: / 1010 lsunB/100 yrs at an average redshift of ~ 0.1 where the errors are respectively statistical and systematic (type misidentification included). This work is based on observations made at the European Southern Observatory, La Silla, Chile.
We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and K... more We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and Keck Array have observed the same approximately 400 deg^{2} patch of sky centered on RA 0 h, Dec. -57.5°. The combined maps reach a depth of 57 nK deg in Stokes Q and U in a band centered at 150 GHz. Planck has observed the full sky in polarization at seven frequencies from 30 to 353 GHz, but much less deeply in any given region (1.2 μK deg in Q and U at 143 GHz). We detect 150×353 cross-correlation in B modes at high significance. We fit the single- and cross-frequency power spectra at frequencies ≥150 GHz to a lensed-ΛCDM model that includes dust and a possible contribution from inflationary gravitational waves (as parametrized by the tensor-to-scalar ratio r), using a prior on the frequency spectral behavior of polarized dust emission from previous Planck analysis of other regions of the sky. We find strong evidence for dust and no statistically significant evidence for tensor modes...
We present a systematic study of SU(3) symmetry breaking in J/psi baryonic decays; first measurem... more We present a systematic study of SU(3) symmetry breaking in J/psi baryonic decays; first measurements are given for the forbidden processes J/psi --> Xi- (1530) Xi+ + c.c. and Xi0 (1530) Xi0 + c.c. Branching ratios for J/gy --> Sigma+/-(1385) Sigma-/+ + c.c. are also obtained; they are consistent with published values and are given with better accuracy. All these
Evidence for the production of b-flavoured baryons in Z 0 decays is reported from the analysis of... more Evidence for the production of b-flavoured baryons in Z 0 decays is reported from the analysis of 365 000 hadronic events collected by the DELPHI detector. Assuming that most of the weakly decaying b flavoured baryons produced by ...
We present the EROS nearby supernova (z ~ 0.02-0.2) search and the analysis of the first year of ... more We present the EROS nearby supernova (z ~ 0.02-0.2) search and the analysis of the first year of data (1997). A total of 80 square degrees were surveyed. Eight supernovae were detected, four of which were spectroscopically identified as type Ia supernovae. The search efficiency was determined with a Monte-Carlo simulation taking into account the efficiencies for both supernova detection and host galaxy identification. Assuming that for a given galaxy the supernova rate is proportional to the galactic luminosity, we compute a type Ia supernova explosion rate of: R = 0.44-0.21+0.35-0.07+0.13 h2 \: / 1010 lsunB/100 yrs at an average redshift of ~ 0.1 where the errors are respectively statistical and systematic (type misidentification included). This work is based on observations made at the European Southern Observatory, La Silla, Chile.
We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and K... more We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and Keck Array have observed the same approximately 400 deg^{2} patch of sky centered on RA 0 h, Dec. -57.5°. The combined maps reach a depth of 57 nK deg in Stokes Q and U in a band centered at 150 GHz. Planck has observed the full sky in polarization at seven frequencies from 30 to 353 GHz, but much less deeply in any given region (1.2 μK deg in Q and U at 143 GHz). We detect 150×353 cross-correlation in B modes at high significance. We fit the single- and cross-frequency power spectra at frequencies ≥150 GHz to a lensed-ΛCDM model that includes dust and a possible contribution from inflationary gravitational waves (as parametrized by the tensor-to-scalar ratio r), using a prior on the frequency spectral behavior of polarized dust emission from previous Planck analysis of other regions of the sky. We find strong evidence for dust and no statistically significant evidence for tensor modes...
We present a systematic study of SU(3) symmetry breaking in J/psi baryonic decays; first measurem... more We present a systematic study of SU(3) symmetry breaking in J/psi baryonic decays; first measurements are given for the forbidden processes J/psi --> Xi- (1530) Xi+ + c.c. and Xi0 (1530) Xi0 + c.c. Branching ratios for J/gy --> Sigma+/-(1385) Sigma-/+ + c.c. are also obtained; they are consistent with published values and are given with better accuracy. All these
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Papers by F. Couchot