نتایج جستجو برای: interferon υ ifn υ
تعداد نتایج: 87282 فیلتر نتایج به سال:
For a given statistic, A, the cosmic distribution function, Υ(Ã), is the probability of measuring a value à in a finite galaxy catalog. For statistics related to count-in-cells, such as factorial moments, Fk, the average correlation function, ξ, and cumulants, SN , the functions Υ(F̃k), Υ( ̃ ξ), and Υ(S̃N ) were measured in a large τCDM simulation. This N-body experiment simulates almost the full ...
The χ(b)(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at sqrt[s] = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb(-1), these states are reconstructed through their radiative decays to Υ(1S,2S) with Υ → μ+ μ-. In addition to the mass peaks corresponding to the decay modes χ(b)(1P,2...
The decays of Υ(1s) → γ(η, η) are studied by an approach which has successfully predicted the ratio Γ(J/ψ→γη ) Γ(J/ψ→γη) . Strong dependence on quark mass has been found in the decays (J/ψ,Υ(1s)) → γ(η, η). Very small decay rates of Υ(1s) → γ(η, η) are
The production of Υ mesons in fixed target pN collisions is considered. It is shown that Non-Relativistic QCD predicts Υ states to be produced with sizeable transverse polarization. The possibility of a measurement of the Υ polarization at the HERA-B experiment is discussed. PACS: 13.20.Gd, 13.88.+e, 13.60.Le, 12.38.Qk Alexander von Humboldt Fellow
CDF has obtained new results on quarkonium production in pp̄ collisions at √ s = 1.8 TeV. We report on measurements of Υ meson production, Υ(1S) production from χb feeddown, and the production polarization of Υ(1S), J/ψ and ψ(2S) mesons.
After nine years of operation the BABAR experiment at the B factory PEPII (Standford Linear Accelerator Center) stopped data taking in April 2008. The last three month of data taking were devoted to ee collisions at center of mass energies of the Υ(2S), Υ(3S) and to an energy scan above the Υ(4S). Besides the observation of the bottomonium ground state ηb, the center of mass energy dependent ee...
It is pointed out that the diagonal amplitude of the E1 − E1 chromo-electric interaction with soft gluon fields (chromo-polarizability) can be measured directly for the J/ψ and Υ resonances in the decays J/ψ → ππℓ + ℓ − and Υ → ππℓ + ℓ − with soft pions. For the J/ψ this amplitude is often discussed in connection with the J/ψ interaction with nuclear matter, while for the Υ the chromo-polarizab...
A search for a two-body transition Υ (3S) → γA0, where A0 is a light scalar particle, followed by its decay into 2 muons has been performed using a data sample of (121 ± 1.2) × 106 Υ (3S) decays. As ΓΥ (4S)/ΓΥ (3S) ≈ 10 3, one has greater sensitivity to rare decays using Υ (3S) decays than Υ (4S) samples. The Standard Model (SM) predicts the existence of the Higgs boson to account for the diffe...
The Υ(4S) is the lowest bb̄ resonance above BB̄ threshold. Its mass and total width had been measured in scans of the total ee cross-section at center of mass energy around 10.58 GeV. 1,2,3,4 The Υ(4S) decays into BB andBB̄ modes allowing these particles to be carefully studied. Many B branching fractions had been measured from Υ(4S) data. Most of them, however, based on the assumption of equal pr...
Properties of bottomonia (Υ, χb and Υ ′) in the Quark-Gluon Plasma (QGP) are investigated by assessing inelastic reaction rates and their interplay with open-bottom states (b quarks or B mesons) and color-screening. The latter leads to vanishing quarkonium-binding energies at sufficiently high temperatures (close to the dissolution point), which, in particular, renders standard gluodissociation...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید