![]() It is shown that all non-weak-basis pairs of quark mass matrices that contain nine zeroes are not compatible with current experimental data. Without any further assumptions, none of these pairs of up- and down- quark mass matrices has physical content. It is also found that all pairs composed of a nonsingular matrix with five zeroes and a nonsingular and nondecoupled matrix with four zeroes simply correspond to a weak basis choice. In the weak basis where a quark mass matrix is nonsingular and has six zeroes in one sector, we find that there are 54 matrices with three zeroes in the other sector, obtainable through right-handed weak basis transformations. The nine zero entries can only be distributed between the up- and down- quark sectors in matrix pairs with six and three texture zeroes or five and four texture zeroes. Since there are ten physical observables, namely, six nonvanishing quark masses, three mixing angles and one CP phase, the maximum number of texture zeroes in both quark sectors is altogether nine. We look for all weak bases that lead to texture zeroes in the quark mass matrices and contain a minimal number of parameters in the framework of the standard model. This extended production phase, most clearly observed at high energies, may be a signature of the acceleration process which produces solar energetic particles (SEP's) in space.More about unphysical zeroes in quark mass matricesĮnergy Technology Data Exchange (ETDEWEB)Įmmanuel-Costa, David, E-mail: [Departamento de FÃsica and Centro de FÃsica Teórica de PartÃculas - CFTP, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa (Portugal) González Felipe, Ricardo, E-mail: [Departamento de FÃsica and Centro de FÃsica Teórica de PartÃculas - CFTP, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa (Portugal) ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Rua Conselheiro EmÃdio Navarro, 1959-007 Lisboa (Portugal) It is also found in one of these flares that a significant portion of this high-energy emission is produced well after the impulsive phase. ![]() ![]() It is found that pion production can occur early in the impulsive phase as defined by hard X-rays near 100 keV. Although the majority of the emission at 10 MeV must be from electron bremsstrahlung, at least two of the flares have spectral properties 40 MeV that require gamma rays from the decay of neutral pions. More than 10 of these flares were detected at photon energies 10 MeV. ![]() The Gamma-Ray Spectrometer (GRS) on SMM has detected more than 130 flares with emission approx 300 keV. We will describe how we isolate and reconstruct the electromagnetic showers to calculate the invariant mass of the photon pair.įorrest, D. Neutral pions are detected through the 2 photon decay that then produce electromagnetic showers. ![]() The experiment is searching for neutral pion production, both in charged current and neutral current, from coherent, resonant and deep-inelastic processes off these targets. MINERÎ❚ is a neutrino-nucleus scattering experiment employing multiple nuclear targets. ![]()
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