# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Measurement of $\pi$/K/p spectra with ALICE in proton-proton collisions at $\sqrt{s} = 900$ GeV and $\sqrt{s} = 7$ TeV

May 23, 2011, 3:40 PM
20m
Salon Haendel AB (Imperial Palace)

### Speaker

Marek Chojnacki (UU/NIKHEF)

### Description

The ALICE experiment features several particle identification systems, which allow us to measure spectra in a broad range of transverse momentum $p_{\mathrm{t}}$ from 100 MeV/c up to a few GeV/c. New results on identified charged particle $p_{\mathrm{t}}$ spectra measured in proton-proton collisions at $\sqrt{s}=7$ TeV will be presented. They will be compared to results obtained at 900 GeV and lower energies, theoretical models and commonly used event generators. The large statistics collected in collisions at $\sqrt{s} = 7$TeV allows us to measure the spectra and yields as a function of the event multiplicity, reaching a $dN/d\eta$ comparable to nuclear collisions at lower energy. The status and perspective of such measurement will also be presented.

### Primary author

Marek Chojnacki (UU/NIKHEF)

 Slides