Measurement of the forward charged particle pseudorapidity density in $pp$ collisions at $\sqrt{s} = 7$ TeV with the TOTEM experiment - INSPIRE

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Measurement of the forward charged particle pseudorapidity density in $pp$ collisions at $\sqrt{s} = 7$ TeV with the TOTEM experiment

TOTEM

Collaboration

•

G Antchev
(
- Sofiya, Inst. Nucl. Res.
)

May, 2012

7 pages

Published in:

EPL 98 (2012) 3, 31002

e-Print:

1205.4105 [hep-ex]

DOI:

10.1209/0295-5075/98/31002

Experiments:

CERN-LHC-TOTEM

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Abstract: (arXiv)

The TOTEM experiment has measured the charged particle pseudorapidity density dN_{ch}/deta in pp collisions at sqrt{s} = 7 TeV for 5.3<|eta|<6.4 in events with at least one charged particle with transverse momentum above 40 MeV/c in this pseudorapidity range. This extends the analogous measurement performed by the other LHC experiments to the previously unexplored forward eta region. The measurement refers to more than 99% of non-diffractive processes and to single and double diffractive processes with diffractive masses above ~3.4 GeV/c^2, corresponding to about 95% of the total inelastic cross-section. The dN_{ch}/deta has been found to decrease with |eta|, from 3.84 pm 0.01(stat) pm 0.37(syst) at |eta| = 5.375 to 2.38 pm 0.01(stat) pm 0.21(syst) at |eta| = 6.375. Several MC generators have been compared to data; none of them has been found to fully describe the measurement.

Note:

7 pages, 3 figures

13.85.Hd
13.85.Lg
charged particle: rapidity spectrum
rapidity: density
p p: scattering
diffraction
TOTEM
transverse momentum
nondiffractive
CERN LHC Coll

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