Indications of suppression of excited Υ states in PbPb collisions at SNN−−−−√ = 2.76 TeV

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

Indications of suppression of excited Υ states in PbPb collisions at SNN−−−−√ = 2.76 TeV

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

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213 Citaten (Scopus)

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A comparison of the relative yields of Upsilon resonances in the mu(+) mu(-) decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in PbPb and pp collisions,(Upsilon(2S+3S)/Upsilon(1S)[PbPb])/(Upsilon(2S+3S)/Upsilon(1S)[pp]), is found to be 0.31 - 0.15 + 0.19 (stat.) +/- 0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, has been calculated to be less than 1%.

Originele taal-2	English
Artikelnummer	052302
Aantal pagina's	25
Tijdschrift	Phys. Rev. Lett.
Volume	107
Status	Published - 2011

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@article{ac65eaae071c4cafb9bb90bbde2c3a42,

title = "Indications of suppression of excited Υ states in PbPb collisions at SNN−−−−√ = 2.76 TeV",

abstract = "A comparison of the relative yields of Upsilon resonances in the mu(+) mu(-) decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in PbPb and pp collisions,(Upsilon(2S+3S)/Upsilon(1S)[PbPb])/(Upsilon(2S+3S)/Upsilon(1S)[pp]), is found to be 0.31 - 0.15 + 0.19 (stat.) +/- 0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, has been calculated to be less than 1%.",

keywords = "CMS, CERN LHC Coll",

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

year = "2011",

language = "English",

volume = "107",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

}

Indications of suppression of excited Υ states in PbPb collisions at SNN−−−−√ = 2.76 TeV. / Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen ; Devroede, Olivier; Gonzalez Suarez, Rebeca; Maes, Michael; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit; Villella, Ilaria.

In: Phys. Rev. Lett., Vol. 107, 052302, 2011.

Onderzoeksoutput: Article › peer review

TY - JOUR

T1 - Indications of suppression of excited Υ states in PbPb collisions at SNN−−−−√ = 2.76 TeV

AU - Blekman, Freya

AU - Blyweert, Stijn

AU - D'Hondt, Jorgen

AU - Devroede, Olivier

AU - Gonzalez Suarez, Rebeca

AU - Maes, Michael

AU - Van Doninck, Walter

AU - Van Mulders, Petra

AU - Van Onsem, Gerrit

AU - Villella, Ilaria

PY - 2011

Y1 - 2011

N2 - A comparison of the relative yields of Upsilon resonances in the mu(+) mu(-) decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in PbPb and pp collisions,(Upsilon(2S+3S)/Upsilon(1S)[PbPb])/(Upsilon(2S+3S)/Upsilon(1S)[pp]), is found to be 0.31 - 0.15 + 0.19 (stat.) +/- 0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, has been calculated to be less than 1%.

AB - A comparison of the relative yields of Upsilon resonances in the mu(+) mu(-) decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in PbPb and pp collisions,(Upsilon(2S+3S)/Upsilon(1S)[PbPb])/(Upsilon(2S+3S)/Upsilon(1S)[pp]), is found to be 0.31 - 0.15 + 0.19 (stat.) +/- 0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, has been calculated to be less than 1%.

KW - CMS

KW - CERN LHC Coll

M3 - Article

VL - 107

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

M1 - 052302

ER -

Indications of suppression of excited Υ states in PbPb collisions at SNN−−−−√ = 2.76 TeV

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