منابع مشابه
The Elusive p-air Cross Section
For the p̄p and pp systems, we have used all of the extensive data of the Particle Data Group[K. Hagiwara et al. (Particle Data Group), Phys. Rev. D 66, 010001 (2002).]. We then subject these data to a screening process, the “Sieve” algorithm[M. M. Block, physics/0506010.], in order to eliminate “outliers” that can skew a χ2 fit. With the “Sieve” algorithm, a robust fit using a Lorentzian distri...
متن کاملp-air cross-section measurement at 1018.5 eV
The interaction cross-section is one of the fundamental properties of any elementary particle. For decades, only accelerator measurements of the particle cross-sections were available. Crosssection measurements at higher and higher energy become possible as more and more powerful accelerators are introduced. However, cosmic rays not only provide a constant flux of ultra highenergy particles, bu...
متن کاملThe Γ * P Total Cross Section and Elastic Diffraction
The empirical scaling law, wherein the total photoabsorption cross section depends on the single variable η = (Q 2 + m 2 0)/Λ 2 (W 2), provides empirical evidence for saturation in the sense of σγ * p(W 2 , Q 2)/σγp(W 2) → 1 for W 2 → ∞ at fixed Q 2. The total photoabsorption cross section is related to elastic diffraction in terms of a sum rule. The excess of diffractive production over the el...
متن کاملcross section
We calculate the cross section for the dissociation of J/ψ by kaons within the framework of a meson exchange model. We find that, depending on the values of the coupling constants used, the cross section can vary from 5 mb to 30 mb at √ s ∼ 5 GeV. In relativistic heavy ion collisions J/ψ suppression has been recognized as an important tool to identify the possible phase transition to quark-gluo...
متن کاملM ay 2 01 0 Υ cross section in p + p collisions at √ s = 200 GeV
We report on a measurement of the Υ(1S+2S+3S) → e + e − cross section at midrapidity in p + p collisions at √ s = 200 GeV. We find the cross section to be 114 ± 38 (stat. + fit) +23 −24 (syst.) pb. Perturbative QCD calculations at next-to-leading order in the Color Evaporation Model are in agreement with our measurement, while calculations in the Color Singlet Model underestimate it by 2σ. Our ...
متن کاملذخیره 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: Czechoslovak Journal of Physics
سال: 2006
ISSN: 0011-4626,1572-9486
DOI: 10.1007/s10582-006-0144-0