Abstract
We present measurements of charged particle production in proton-proton collisions at centre-of-mass energies of √s = 0.9, 2.36 and 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. Events were collected using a single-arm minimum bias trigger, charged tracks are measured with high precision in the inner tracking system. Minimum bias analysis uses data samples at all three energies, while diffractive events are studied using a sample of events at √s = 7 TeV. To study diffractive interactions, the events that have hits on exactly one side of the ATLAS detector were selected. The charged particle multiplicity, pseudorapidity and transverse momentum spectra are analyzed and compared to the predictions by various Monte Carlo models.
Highlights
IntroductionThe results of soft proton collisions at QCD measurements of centre-of-mass energies cohfa√rgsed=p0a.r9t,ic2l.e36praonddu7ctTioenVinuspinrogtothne-
The results of soft proton collisions at QCD measurements of centre-of-mass energies cohfa√rgsed=p0a.r9t,ic2l.e36praonddu7ctTioenVinuspinrogtothne-ATLAS detector [1] at the LHC are presented here
An understanding of soft particle production processes is important for precision measurements to be made at the LHC and is crucial for understanding of QCD
Summary
The results of soft proton collisions at QCD measurements of centre-of-mass energies cohfa√rgsed=p0a.r9t,ic2l.e36praonddu7ctTioenVinuspinrogtothne-. An understanding of soft particle production processes is important for precision (high transverse momentum) measurements to be made at the LHC and is crucial for understanding of QCD effects, total cross section determination, understanding of saturation effects, jet studies, mass reconstruction. These measurements should be done early on, at low luminosity to avoid the effect of overlapping (“pile-up”) collisions at high luminosities. For the measurements presented here, the trigger relies on the Beam Pickup Timing devices (BPTX) and the Minimum Bias Trigger Scintillators (MBTS). The results obtained by these methods were found to agree within 3%
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