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Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z Boson events from pp collisions at √¯s = 7 TeV

Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z Boson events from pp collisions at √¯s = 7 TeV
Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z Boson events from pp collisions at √¯s = 7 TeV
A study of forward energy flow and central charged-particle multiplicity in events with W and Z bosons decaying into leptons is presented. The analysis uses a sample of 7 TeV pp collisions, corresponding to an integrated luminosity of 36 pb−1, recorded by the CMS experiment at the LHC. The observed forward energy depositions, their correlations, and the central charged-particle multiplicities are not well described by the available non-diffractive soft-hadron production models. A study of about 300 events with no significant energy deposited in one of the forward calorimeters, corresponding to a pseudorapidity gap of at least 1.9 units, is also presented. An indication for a diffractive component in these events comes from the observation that the majority of the charged leptons from the W(Z) decays are found in the hemisphere opposite to the gap. When fitting the signed lepton pseudorapidity distribution of these events with predicted distributions from an admixture of diffractive (pompyt) and non-diffractive (pythia) Monte Carlo simulations, the diffractive component is determined to be (50.0 ± 9.3 (stat.) ± 5.2 (syst.))%.
1434-6044
Chatrchyan, Serguei
23ce6af5-bdd2-435c-92c8-9b1b71a261ee
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Chatrchyan, Serguei
23ce6af5-bdd2-435c-92c8-9b1b71a261ee
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Chatrchyan, Serguei and Belyaev, Alexander , The CMS Collaboration (2012) Forward energy flow, central charged-particle multiplicities, and pseudorapidity gaps in W and Z Boson events from pp collisions at √¯s = 7 TeV. The European Physical Journal C, 72 (1839). (doi:10.1140/epjc/s10052-011-1839-3).

Record type: Article

Abstract

A study of forward energy flow and central charged-particle multiplicity in events with W and Z bosons decaying into leptons is presented. The analysis uses a sample of 7 TeV pp collisions, corresponding to an integrated luminosity of 36 pb−1, recorded by the CMS experiment at the LHC. The observed forward energy depositions, their correlations, and the central charged-particle multiplicities are not well described by the available non-diffractive soft-hadron production models. A study of about 300 events with no significant energy deposited in one of the forward calorimeters, corresponding to a pseudorapidity gap of at least 1.9 units, is also presented. An indication for a diffractive component in these events comes from the observation that the majority of the charged leptons from the W(Z) decays are found in the hemisphere opposite to the gap. When fitting the signed lepton pseudorapidity distribution of these events with predicted distributions from an admixture of diffractive (pompyt) and non-diffractive (pythia) Monte Carlo simulations, the diffractive component is determined to be (50.0 ± 9.3 (stat.) ± 5.2 (syst.))%.

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Published date: 20 January 2012

Identifiers

Local EPrints ID: 412503
URI: https://eprints.soton.ac.uk/id/eprint/412503
ISSN: 1434-6044
PURE UUID: 51ed97c3-eb65-4219-93d3-aff2a9a82cc2
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 17 Jul 2017 14:00
Last modified: 15 Mar 2019 01:33

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