# ICRC2015

July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

## The TOTEM experiment at LHC for proton-proton cross section measurements.

Jul 30, 2015, 11:15 AM
15m
Yangtze 2 (World Forum)

### Yangtze 2

#### World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution CR-EX

### Speaker

Francesco Cafagna (Universita e INFN, Bari (IT))

### Description

The precise knowledge of the proton-proton cross section is extremely important to model the development, in the atmosphere, of the showers induced by the interaction of ultra high energy cosmic rays. The TOTEM (TOTal cross section, Elastic scattering and diffraction dissociation Measurement at the LHC) experiment at LHC, has been designed to measure the total proton-proton cross-section with a luminosity independent method, based on the optical theorem, and study the elastic and diffractive scattering at the LHC energy. This method relies on the capability of the simultaneous measurements of inelastic and elastic rates; in the TOTEM experiment this is possible thanks to two forward inelastic telescopes, covering the pseudorapitidy range 3.1 $< \|\eta\| <$ 6.5, and Roman Pot detectors, that can be inserted down to few hundred microns to the beam centre. Thanks to dedicated runs, taken between 2011 and 2012, with special beam optics, TOTEM experiment was able to measure the elastic, inelastic and total cross-section at $\sqrt{s}=7~TeV$ and $8~TeV$, using the luminosity independent method, along with the pseudorapidity distribution of charged particles. In this contribution the latest results of the TOTEM experiment will be described along with its performance and the future physics program for the LHC run 2.
Registration number following "ICRC2015-I/" 575 TOTEM

### Primary author

Francesco Cafagna (Universita e INFN, Bari (IT))