نتایج جستجو برای: decay
تعداد نتایج: 73625 فیلتر نتایج به سال:
A simple model is discussed to give rise to successful reheating in chaotic D-term inflation with a quadratic inflaton potential. Leptogenesis through the inflaton decay is also discussed in this model.
We have studied the Cabibbo suppressed decay Λc → Σ +K∗0(892) and the Cabibbo favored decays Λc → Σ +K+K−, Λc → Σ +φ and Λc → Ξ ∗0(Σ+K−)K+ and measured their branching ratios relative to Λc → Σ +π+π− to be (7.8 ± 1.8 ± 1.3)%, (7.1 ± 1.1 ± 1.1)%, (8.7 ± 1.6 ± 0.6)% and (2.2 ± 0.6 ± 0.6)%, respectively. The first error is statistical and the second is systematic. We also report two 90% confidence...
We extract a relatively precise value for the decay constant of the D+ meson by measuring B(D+ → μνμ) = (4.45± 0.67 −0.36)× 10−4 using 280 pb−1 of data taken on the ψ(3770) resonance with the CLEO-c detector. We find fD+ = (223±16+7 −9) MeV . We also set a 90% confidence upper limit on B(D+ → e+ν) < 2.4× 10−5. ∗Submitted to the XXII International Symposium on Lepton and Photon Interactions at H...
We have observed the decay B+ → D̄0K+, using 3.3 million BB̄ pairs collected with the CLEO II detector at the Cornell Electron Storage Ring. We find the ratio of branching fractions R ≡ B(B+ → D̄0K+)/B(B+ → D̄0π+) = 0.055 ± 0.014 ± 0.005.
I consider the problem of the evaluation of the orthopositronium decay rate, including second order radiative corrections. I present a brief theoretical discussion of this problem and a review of the results available in literature, and, then, I analyze some O(α 2) annihilation-type contributions, recently computed.
background and objectives: dental caries, caused by oral microbial flora, is considered as one of the most common infectious diseases in human. the aim of this study was to determine the effect of short-term consumption of probiotic yogurt containing bifidobacterium lactis on salivary streptococcus mutans and lactobacilli in students with initial stages of dental caries. materials and methods: ...
background: thalassemia is the most common single-gene disorder that carries along many difficulties and effects such as oral and dental problems in patients. this study aimed to determine dmft indicator and its correlation with the amount of serum ferritin and hemoglobin in patients with thalassemia major. materials and methods: this cross-sectional study has been conducted by descriptive-anal...
We provide a new, dynamical criterion for the radial rapid decay property. work out in detail special case of group ?:=SL 2 (A), where A:=???? q [X,X -1 ] is ring Laurent polynomials with coefficients ???? , endowed length function coming from natural action ? on product two trees, and show that it has (RRD) property doesn’t have (RD) also applies to all irreducible lattices (uniform or not) se...
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