E. McCliment

SEARCH FOR LIGHT SUPERSYMMETRIC BARYONS

We have searched for the production and decay of light supersymmetric baryons produced in 800 GeV/c proton copper interactions in a charged hyperon beam experiment. We observe no evidence for the decays R{sup +}(uud{tilde g}){r_arrow} S{sup 0}(uds{tilde g}){pi}{sup +} and X{sup -}(ssd{tilde g}){r_arrow} S{sup 0}(uds{tilde g}){pi}{sup -} in the parent mass and lifetime ranges of 1700{endash}2500 MeV/c{sup 2} and 50{endash}500ps. Production upper limits for R{sup +} at x{sub F}=0.47, P{sub t}=1.4GeV/c{sup 2} and X{sup -} at x{sub F}=0.48, P{sub t}=0.65GeV/c{sup 2} of less than 10{sup -3} of all charged secondary particles produced are obtained for all but the highest masses and shortest lifetimes predicted. {copyright} {ital 1997} {ital The American Physical Society}

Energy resolution and the linearity of the CMS forward quartz fibre calorimeter pre-production-prototype (PPP-I)

The first pre-production-prototype (PPP-I) of the quartz fibre calorimeter of the CMS detector has been tested at CERN. The calorimeter consists of quartz fibres embedded in an iron matrix. Results are presented on the energy resolution and on the signal uniformity of the prototype for electrons and pions and the signal uniformity and linearity.

New upper limit for the branching ratio of the Omega ---> Xi - gamma radiative decay.

We have searched for the rare hyperon radiative decay Omega- to Xi- gamma, using the Fermilab Proton Center 375 GeV/c charged hyperon beam. Our measurement of the Omega- beam fraction at 13.6 m from production is (4.8 +_ 0.4)10**(-5). No signal was found and we determine a new upper limit of (4.6 x 10**-4) at 90% CL for the Omega- to Xi- gamma branching ratio.

High energy physics at the University of Iowa

This report discusses hyperon spin physics and hadronic interactions at Fermilab. A number of detection systems are discussed. (LSP)

Decomposition of the Principal Series of Unitary Irreducible Representations of SU(2, 2) Restricted to the Subgroup SU(1,1)⊗SU(2)

An explicit form is given for the unitary irreducible representations of the principal nondegenerate series of the group SU(2, 2). These representations are then restricted to the subgroup SU(1,1)⊗SU(2) and are found to be equivalent to the regular representation of SU(1,1)⊗SU(2).

An estimate of the neutron electric-dipole moment

SummaryUtilizing the once-integrated commutation relations and the techniques of current algebra, a relation between the neutron electric-dipole moment and theCP-violating parameterɛ′ is established. This relation can be used to place an upper limit on |ɛ′|.RiassuntoUtilizzando le relazioni di commutazione integrate una volta e le tecniche dell’algebra delle correnti, si stabilisce una relazione fra il momento di dipolo elettrico del neutrone ed il parametroɛ′ che violaCP. Si può usare questa relazione per porre un limite superiore a |ɛ′|.РеэумеИсполяэуя однократно проинтегрированные коммутационные соотнощения и технику алгебры токов, устанавливается соотнощение мезду Электрическим диполяным моментом неитрона и параметром ОР-нарущенияе’ . Это соотнощение мозет бытя исполяэовано для определения верхнего предела для |ɛ′|.