نتایج جستجو برای: critical constant
تعداد نتایج: 686787 فیلتر نتایج به سال:
We study Sogami’s generalized covariant derivative method for a SU(2)L × SU(2)R ×U(1)B−L × SU(3)c model that contains bi-doublet and triplet Higgs bosons. In particular, a detailed study is made on the minimization conditions of the Higgs potential. It is known that a minimization condition and certain phenomenology for a extra gauge boson mass derive a restriction on potential parameters, whic...
We measured, with the KLOE detector, the spectrum of π+π− invariant mass in a sample of 6.7 × 105 e+e− → π+π−γ events with the photon at large polar angle (θγ > 45 ) at a centre of mass energy √ s around the φ mass. We observe in this spectrum a clear contribution from the intermediate process φ → f0(980)γ. A sizeable effect is also observed in the distribution of the pion forward-backward asym...
We investigate the dependence of the nucleon-nucleon force in the deuteron system on the values of coupling strengths at high energy, which will in general depend on the geometry of extra dimensions. The stability of deuterium at all times after nucleosynthesis sets a bound on the time variation of the ratio of the QCD confinement scale to light quark masses. We find the relation between this r...
We derive various solutions for the gauge field and the gaugino when there are both 5D bulk kinetic terms and 4D brane kinetic terms. Below the compactification scale 1/yc, gauge interaction by the massless mode is universal, independent of the locations of sources, but above 1/yc, the interaction distinguishes their locations. We consider the S/(Z2 × Z ′ 2) orbifold compactification, in which ...
We consider a U(1) gauge theory, minimally coupled to a massless Dirac field, where a higher-derivative term is added to the pure gauge sector, as in the Lee-Wick models. We find that this term can trigger chiral symmetry breaking at low energy in the weak coupling regime. Then, the fermion field acquires a mass that turns out to be a function of both the energy scale associated to the higher-d...
We show how nonzero small Dirac neutrino masses can be radiatively generated by extending MSSM with right-handed neutrinos and leptoquark chiral multiplets without violating R-parity. In general the leptoquark representations are very restrictive due to the holomorphicity of the superpotential and the cancellation of the anomaly from SUSY leptoquark partners (slepto-quarks). Using theses leptoq...
We measured, with the KLOE detector, the spectrum of π+π− invariant mass in a sample of 6.7 × 105 e+e− → π+π−γ events with the photon at large polar angle (θγ > 45 ) at a centre of mass energy √ s around the φ mass. We observe in this spectrum a clear contribution from the intermediate process φ → f0(980)γ. A sizeable effect is also observed in the distribution of the pion forward-backward asym...
the purpose of this study was to find the relationship between critical thinking and self-regulation with reading comprehension of iranian female elementary language learners. the present study is a correlational one having a descriptive design. two questionnaires, critical thinking questionnaire and self-regulation questionnaire which were valid and reliable questionnaires and four reading com...
The effects of allopurinol, acyclovir and theophylline on the activity of adenosine deaminase (ADA) were studied in 50 mM sodium phosphate buffer pH 7.5 at 27°C, using a UV– Vis spectrophotometer. Adenosine deaminase is inhibited by these ligands, via different types of inhibition. Allopurinol, as a transition state analog of xanthine oxidase, and acyclovir competitively inhibit the catalytic a...
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