نتایج جستجو برای: gev
تعداد نتایج: 18737 فیلتر نتایج به سال:
We demonstrate a quantum nanophotonics platform based on germanium-vacancy (GeV) color centers in fiber-coupled diamond nanophotonic waveguides. We show that GeV optical transitions have a high quantum efficiency and are nearly lifetime broadened in such nanophotonic structures. These properties yield an efficient interface between waveguide photons and a single GeV center without the use of a ...
Preliminary results of the analyzing power for the production of forward, high-energy π 0 mesons from collisions of transversely polarized protons at √ s = 200 GeV from STAR are presented. The kinematic ranges covered by the data are x F ≈ 0.2 − 0.6 and p T ≈ 1 − 3 GeV/c. The analyzing power at √ s = 200 GeV is found to be comparable to that observed at √ s = 20 GeV.
In this article, we calculate the masses and the pole residues of the 1 2 + heavy baryons Ω0c(css) and Ω − b (bss) with the QCD sum rules. The numerical values Ωc = (2.72 ± 0.18)GeV (or Ωc = (2.71 ± 0.18)GeV) and Ωb = (6.13 ± 0.12)GeV (or M Ω − b = (6.18 ± 0.13)GeV) are in good agreement with the experimental data. PACS number: 14.20.Lq, 14.20.Mr
We estimate the top quark, lightest sparticle (LSP) and scalar higgs masses within a supersymmetric grand unified framework in which tan β ≃ mt/mb and the electroweak symmetry is radiatively broken. The requirement that the calculated b quark mass lie close to its measured value, together with the cosmological constraint ΩLSP ≈ 1, fixes the top quark mass to bemt(mt) ≈ 170±15 GeV . The LSP (of ...
در فرایند نابودی الکترون ـ پوزیترون، ذرات مختلفی از جمله پایونها تولید می شوند . اکثرپایونها از راس اصلی ، یعنی مستقیماً از نابودی زوج حاصل می شوند اما تعدادی از آنها ، از ذرات واسطه ی دیگر نظیر و تولید می شوند . در این پایان نامه هدف این است که با بدست آوردن نمودار فراوانی بر حسب جرم موثر زوج ذرات یا سه ذره ای های پایون ، برای تمام ترکیبات یک رویداد و مقایسه ی آن با نمودار زمینه ، درصد تولید ذر...
در این پژوهش به منظور محاسبه ی سطح موثر آرایه ی آشکار ساز پرتوهای کیهانی نصب شده در دانشگاه صنعتی شریف تعداد 10502 بهمن برای ذرات اولیه فوتون و پروتون در 5 بازه ی انرژی از gev 103 تا gev 107 و 8 بازه ی زاویه سرسویی از ?0 تا?70 و همین طور زوایای سمتی از?160- ،?140- ،... تا ?180 در ارتفاع 1200 متر از سطح دریا (ارتفاع تهران) شبیه سازی شدند. در گام بعد برنامه ای به زبان فرترن نوشته شد که سطح موثر ر...
We investigate the production of e + e − pairs from p + Be and nucleus-nucleus collisions from 2 GeV/A to 200 GeV/A within a covariant transport approach and focus on the dilepton angular anisotropies as a function of the dilepton invariant mass. Whereas the low mass regime yields information about the Dalitz decays of the ∆, η and ω, above M ≈0.5 GeV the angular anisotropies provide additional...
A comparison of the reactions Yp-+r’n and r-p-p’n at 4 and 8 GeV/c has been made using the vector dominance model. Although the P” data are insufficient to show the very narrow forward peak observed in the photoproduction data, agreement is obtained to within errors for I I t s0.1 (GeV/c)2 . Taking interference effects into account, this agreement can be extended to 1 tl M 1.5 (GeV/c)2 at 4 GeV...
A search for supersymmetry in events with large missing transverse momentum, jets, and at least one hadronically decaying tau lepton has been performed using 3.2 fb−1 of proton–proton collision data at √ s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider in 2015. Two exclusive final states are considered, with either exactly one or at least two tau leptons. No excess over th...
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