Hadronic cross - section fluctuations and proton coherent diffractive dissociation on helium
نویسندگان
چکیده
The differential cross-section of inelastic coherent diffractive dissociation off nuclei p + 4 He → X + 4 He is expressed in terms of the relative cumulants of the cross-section distribution P N (σ). The theoretical result for the ratio r = dσ dif f dt pHe t=0 dσ dif f dt pp t=0 = 6.8 ÷ 7.6 is close to the value r = 7.1 ± 0.7 which we extracted from the FNAL data. These are the only A > 2 data of this kind. The comparison provides the first confirmation of the cross-section fluctuation approach to the description of the absolute value of the inelastic diffraction cross-section off nuclei. It provides also a new constraint on the first 4 cumulants of the cross-section distribution.
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