منابع مشابه
Study of η and η' Photoproduction at MAMI.
The reactions γp→ηp and γp→η^{'}p are measured from their thresholds up to the center-of-mass energy W=1.96 GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproducti...
متن کاملStudy of B s → ( η , η ′ , φ ) l l̄
We study the rare decays of B s → M s ℓ ¯ ℓ (M s = η, η ′ , φ and ℓ = ν, e, µ, τ) in the standard model. With the hadronic form factors evaluated in the light front and constituent quark models, we estimate the decay branching ratios, respectively. We also discuss the longitudinal lepton polarization and forward-backward asymmetries.
متن کاملOn the gluon content of the η and η mesons
A phenomenological analysis of radiative V → Pγ and P → V γ decays is performed with the purpose of determining the gluonic content of the η and η′ wave functions. Our results show that within our model there is no evidence for a gluonium contribution in the η, Z2 η = 0.00±0.12, or the η′, Z2 η = 0.04±0.09. In terms of a mixing angle description this corresponds to φP = (41.4±1.3)◦ and |φη′G| =...
متن کاملA Theoretical Study on Seasonality
In addition to being endogenous, a circadian system must be able to communicate with the outside world and align its rhythmicity to the environment. As a result of such alignment, external Zeitgebers can entrain the circadian system. Entrainment expresses itself in coinciding periods of the circadian oscillator and the Zeitgeber and a stationary phase difference between them. The range of perio...
متن کاملtask-based language teaching in iran: a mixed study through constructing and validating a new questionnaire based on theoretical, sociocultural, and educational frameworks
جنبه های گوناگونی از زندگی در ایران را از جمله سبک زندگی، علم و امکانات فنی و تکنولوژیکی می توان کم یا بیش وارداتی در نظر گرفت. زبان انگلیسی و روش تدریس آن نیز از این قاعده مثتسنی نیست. با این حال گاهی سوال پیش می آید که آیا یک روش خاص با زیر ساخت های نظری، فرهنگی اجتماعی و آموزشی جامعه ایرانی سازگاری دارد یا خیر. این تحقیق بر اساس روش های ترکیبی انجام شده است.پرسش نامه ای نیز برای زبان آموزان ...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2021
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2021.115447