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arXiv 1306.2149hep-ph
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LHC处的衍射

Diffraction at the LHC

V. A. Khoze, A. D. Martin, M. G. Ryskin

摘要:

我们证明了从CERN ISR到LHC能量范围内的衍射pp(和p \bar{p})数据(关于σ_tot,dσ_el/dt,质子解离成低质量系统,σ^D(低M),和高质量解离,dσ/d(Δη))可以用只有一个“有效”坡密子的双通道程子模型来描述。通过允许坡密子与衍射本征态的耦合依赖于对撞机能量(正如理论上所预期的那样),我们能够解释在LHC上测量到的σ^D(低M)的低值。我们计算了快度间隙在“软重散射”中的生存概率S^2。我们要强调的是,S^2的值对衍射本征态的详细结构特别敏感。

英文摘要:

We show that the diffractive pp (and p\bar{p}) data (on σ_tot, dσ_el/dt, proton dissociation into low-mass systems, σ^D(low M), and high-mass dissociation, dσ/d(Δη)) in a wide energy range from CERN-ISR to LHC energies, may be described in a two-channel eikonal model with only one `effective' pomeron. By allowing the pomeron coupling to the diffractive eigenstates to depend on the collider energy (as is expected theoretically) we are able to explain the low value of σ^D(low M) measured at the LHC. We calculate the survival probability, S^2, of a rapidity gap to survive `soft rescattering'. We emphasize that the values found for S^2 are particularly sensitive to the detailed structure of the diffractive eigenstates.

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