We have studied the diffractive dissociation into dijets of 500 GeV/c pions scattering coherently from carbon and platinum targets. Extrapolating to asymptotically high energies (where t(min)-->0), we find that when the per-nucleus cross section for this process is parametrized as sigma = sigma0Aalpha, alpha has values near 1.6, the exact result depending on jet transverse momentum. These values are in agreement with those predicted by theoretical calculations of color-transparency.
about 50% across disciplines. Blame for this unfortunate loss of students was most often attributed to the large, impersonal lecture format rather than to the subject being taught. We wanted to improve the lecture experience by actively involving the students more in the lecture itself. Reasons for the reluctance of students to respond in a large lecture were understandable. Recent articles by Hake 2 and Poulis 3 furnish data to support our approach and have established the value of modifying the passive lecture with "interactive engagement." Although many suggestions and innovations have been proposed and tried, 4-15 there had not been a solution to the problem of the passive large lecture proven to be successful, flexible, and cost-effective for a wide variety of students.
We report the first evidence for the decay Sigma(+)-->pmu(+)mu(-) from data taken by the HyperCP (E871) experiment at Fermilab. Based on three observed events, the branching ratio is B(Sigma(+)-->pmu(+)mu(-))=[8.6(+6.6)(-5.4)(stat)+/-5.5(syst)]x10(-8). The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, Sigma(+)-->pP(0),P0-->mu(+)mu(-) with a P0 mass of 214.3+/-0.5 MeV/c(2) and branching ratio B(Sigma(+)-->pP(0),P0-->mu(+)mu(-))=[3.1(+2.4)(-1.9)(stat)+/-1.5(syst)]x10(-8).
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