Inelastic proton-proton cross section measurements in CMS at sqrt(s)=7 TeV

TL;DR

This paper reports measurements of the total inelastic proton-proton cross section at 7 TeV using CMS detector data, employing two different methods to ensure accuracy and correction to hadron level.

Contribution

It introduces two complementary methods for measuring the inelastic pp cross section at 7 TeV with CMS, improving precision and correction techniques.

Findings

Measured inelastic pp cross section at 7 TeV

Used calorimeter coverage for low pile-up runs

Fitted Poisson distribution for high pile-up runs

Abstract

We present measurements of the total inelastic pp cross section at 7 TeV obtained with the CMS detector. Two different methods are used. In runs with low event pile-up, we exploit the large pseudorapidity coverage (|\eta|<5.2) of the CMS calorimeters to obtain the cross section for events with any activity in the acceptance range. In addition, runs with high event pile-up are used by fitting a Poisson distribution with the total visible cross section as parameter to the number of reconstructed primary vertices. Both measurements are corrected to a hadron level definition of the inelastic cross section.