Measurement of the Underlying Event Activity at the LHC with s√=7 TeV and Comparison with s√=0.9 TeV

Freya Blekman; Stijn Blyweert; Jorgen D'Hondt; Olivier Devroede; Rebeca Gonzalez Suarez; Alexis Kalogeropoulos; Michael Maes; Walter Van Doninck; Petra Van Mulders; Gerrit Van Onsem; Ilaria Villella

Measurement of the Underlying Event Activity at the LHC with s√=7 TeV and Comparison with s√=0.9 TeV

Freya Blekman, Stijn Blyweert, Jorgen D'Hondt, Olivier Devroede, Rebeca Gonzalez Suarez, Alexis Kalogeropoulos, Michael Maes, Walter Van Doninck, Petra Van Mulders, Gerrit Van Onsem, Ilaria Villella

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A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |eta| <2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.

Originele taal-2	English
Artikelnummer	109
Pagina's (van-tot)	1-27
Aantal pagina's	28
Tijdschrift	JHEP
Volume	2011
Nummer van het tijdschrift	9
Status	Published - 2011

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Blekman, Freya ; Blyweert, Stijn ; D'Hondt, Jorgen ; Devroede, Olivier ; Gonzalez Suarez, Rebeca ; Kalogeropoulos, Alexis ; Maes, Michael ; Van Doninck, Walter ; Van Mulders, Petra ; Van Onsem, Gerrit ; Villella, Ilaria. / Measurement of the Underlying Event Activity at the LHC with s√=7 TeV and Comparison with s√=0.9 TeV. In: JHEP. 2011 ; Vol. 2011, Nr. 9. blz. 1-27.

@article{c75839ba673e4cc7852fc7ce74fab767,

title = "Measurement of the Underlying Event Activity at the LHC with s√=7 TeV and Comparison with s√=0.9 TeV",

abstract = "A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |eta| <2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.",

keywords = "Hadron-hadron scattering, CMS",

author = "Freya Blekman and Stijn Blyweert and Jorgen D'Hondt and Olivier Devroede and {Gonzalez Suarez}, Rebeca and Alexis Kalogeropoulos and Michael Maes and {Van Doninck}, Walter and {Van Mulders}, Petra and {Van Onsem}, Gerrit and Ilaria Villella",

year = "2011",

language = "English",

volume = "2011",

pages = "1--27",

journal = "The Journal of high energy physics",

issn = "1126-6708",

publisher = "Springer Verlag",

number = "9",

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Measurement of the Underlying Event Activity at the LHC with s√=7 TeV and Comparison with s√=0.9 TeV. / Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen ; Devroede, Olivier; Gonzalez Suarez, Rebeca; Kalogeropoulos, Alexis; Maes, Michael; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit; Villella, Ilaria.

In: JHEP, Vol. 2011, Nr. 9, 109, 2011, blz. 1-27.

Onderzoeksoutput: Article › peer review

TY - JOUR

T1 - Measurement of the Underlying Event Activity at the LHC with s√=7 TeV and Comparison with s√=0.9 TeV

AU - Blekman, Freya

AU - Blyweert, Stijn

AU - D'Hondt, Jorgen

AU - Devroede, Olivier

AU - Gonzalez Suarez, Rebeca

AU - Kalogeropoulos, Alexis

AU - Maes, Michael

AU - Van Doninck, Walter

AU - Van Mulders, Petra

AU - Van Onsem, Gerrit

AU - Villella, Ilaria

PY - 2011

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N2 - A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |eta| <2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.

AB - A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |eta| <2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.

KW - Hadron-hadron scattering

KW - CMS

M3 - Article

VL - 2011

SP - 1

EP - 27

JO - The Journal of high energy physics

JF - The Journal of high energy physics

SN - 1126-6708

IS - 9

M1 - 109

ER -

Measurement of the Underlying Event Activity at the LHC with s√=7 TeV and Comparison with s√=0.9 TeV

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