SEX IDENTIFICATION OF HUMPBACK WHALES, MEGAPTERA-NOVAEANGLIAE, ON THE WINTERING GROUNDS OF THE MEXICAN PACIFIC-OCEAN

The sex of 43 humpback whales (Megaptera novaeangliae) from different social groupings in the Mexican Pacific was identified by a molecular analysis of skin biopsy samples. Of the 18 whales sampled from surface-active groups, 17 were males. Three singers were sampled and identified as males. In two cases, whales interrupting and joining a singer without exhibiting agonistic behavior were identified as females. A higher proportion of males was found in the samples collected at the Revillagigedo Islands, reflecting a greater sampling effort on surface-active groups. Preliminary data showed that along the Mexican Pacific coast, the migratory arrival of males corresponds closely to the timing of competitive activity

Charged particle production in S-S collisions at 200 GeV/c per nucleon

Charged particle production in central S-S collisions at 200 GeV/c per nucleon has been studied by the WA94 experiment at the CERN-SPS. Particle identification has been provided by the Omega RICH, while a silicon telescope in the Omega spectrometer and an array of MultiWire Proportional Chambers have been used to trace particles through the RICH detector. Production ratios and transverse mass spectra for pi(+/-), K+/- and p((p) over bar) at central rapidity and p(T) > 1.3 GeV/c are presented. (C) 1997 Elsevier Science B.V

Study of charged particle production using omega RICH in WA94 experiment

We present preliminary results about charged particle production in S-S collisions at 200 GeV/c per nucleon, obtained by WA94 experiment at CERN-SPS. The particle identification has been provided by the Omega RICH; a silicon telescope and an array of multiwire proportional chambers (MWPC) have been used to track particles to the RICH detector. Details about particle tracking and identification procedure are also reported

STRANGE PARTICLE-PRODUCTION IN SULFUR-SULFUR INTERACTIONS AT 200 GEV/C PER NUCLEON

The WA94 experiment is designed to study the production of strange and multistrange baryons and antibaryons at central rapidity in sulphur-sulphur interactions at 200 GeV/c per nucleon. Particle production ratios have been obtained in the kinematic region 1.2 less than or equal to p(T) less than or equal to 3.0 GeV/c and 2.5 less than or equal to y(lab) less than or equal to 3.0, and m(T) spectra for Lambda, , Xi(-) and (-) particles are presented. Preliminary results on charged kaon production are also discussed, together with the: status of charged particle identification using the Omega RICH

Hyperon production in proton-sulphur collisions at 200 GeV/c

The WA94 experiment uses the production of strange particles and antiparticles to investigate the properties of hot hadronic matter created in heavy-ion interactions. Lambda, , Xi(-) and (+) particle yields and transverse mass spectra are presented for pS interactions. These results are compared with those from SS interactions. Our results are also compared with those from pW and SW interactions of the WA85 experiment. (C) 1997 Published by Elsevier Science B.V

Measurement of hadron and lepton-pair production at 161 GeV<root s<172 GeV at LEP

Contains fulltext : 26256.pdf (publisher's version ) (Open Access

Charged particle production in S-S collisions at 200 GeV/c per nucleon

Charged particle production in central S-S collisions at 200 GeV/c per nucleon has been studied by the WA94 experiment at the CERN-SPS. Particle identification has been provided by the Omega RICH, while a silicon telescope in the Omega spectrometer and an array of MultiWire Proportional Chambers have been used to trace particles through the RICH detector. Production ratios and transverse mass spectra for pi(+/-), K+/- and p((p) over bar) at central rapidity and p(T) &gt; 1.3 GeV/c are presented. (C) 1997 Elsevier Science B.V

A Measurement of Pi-Polarization at Lep

Contains fulltext : 26223.pdf (publisher's version ) (Open Access

Hyperon production in proton-sulphur collisions at 200 GeV/c

The WA94 experiment uses the production of strange particles and antiparticles to investigate the properties of hot hadronic matter created in heavy-ion interactions. Lambda, &lt;(Lambda)over bar&gt;, Xi(-) and &lt;(Xi)over bar&gt;(+) particle yields and transverse mass spectra are presented for pS interactions. These results are compared with those from SS interactions. Our results are also compared with those from pW and SW interactions of the WA85 experiment. (C) 1997 Published by Elsevier Science B.V