J/¿ production as a function of charged particle multiplicity in pp collisions at  v s = 7 TeV

B. Abelev; Hans Bøggild; Ian Bearden; Christian Holm Christensen; Hans Hjersing Dalsgaard; Kristjan Herlache Gulbrandsen; Jens Jørgen Gaardhøje; Børge Svane Nielsen; Casper Nygaard; Carsten Søgaard

J/¿ production as a function of charged particle multiplicity in pp collisions at v s = 7 TeV

B. Abelev, Hans Bøggild, Ian Bearden, Christian Holm Christensen, Hans Hjersing Dalsgaard, Kristjan Herlache Gulbrandsen, Jens Jørgen Gaardhøje, Børge Svane Nielsen, Casper Nygaard, Carsten Søgaard

Experimental Particle Physics

92 Citations (Scopus)

Abstract

The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dN_ch/dη in pp collisions at s=7TeV at the LHC. J/ψ particles are detected for p_t>0, in the rapidity interval |y|<0.9 via decay into e⁺e^-, and in the interval 2.5<y<4.0 via decay into μ⁺μ^- pairs. An approximately linear increase of the J/ψ yields normalized to their event average (dN_J/ψ/dy)/〈 dN_J/ψ/dy〉 with (dN_ch/dη)/〈 dN_ch/dη〉 is observed in both rapidity ranges, where dN_ch/dη is measured within |η|<1 and p_t>0. In the highest multiplicity interval with 〈 dN_ch/dη(bin)〉 =24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5<y<4 (8 at |y|<0.9) is observed.

Original language	English
Journal	Physics Letters B
Volume	712
Issue number	6
Pages (from-to)	165-175
ISSN	0370-2693
Publication status	Published - 6 Jun 2012

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http://dx.doi.org/10.1016/j.physletb.2012.04.052

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@article{fc6508964e6a45fe9a590e59cce67b31,

title = "J/¿ production as a function of charged particle multiplicity in pp collisions at v s = 7 TeV",

abstract = "The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dNch/dη in pp collisions at s=7TeV at the LHC. J/ψ particles are detected for pt>0, in the rapidity interval |y|<0.9 via decay into e+e-, and in the interval 2.5+μ- pairs. An approximately linear increase of the J/ψ yields normalized to their event average (dNJ/ψ/dy)/〈 dNJ/ψ/dy〉 with (dNch/dη)/〈 dNch/dη〉 is observed in both rapidity ranges, where dNch/dη is measured within |η|<1 and pt>0. In the highest multiplicity interval with 〈 dNch/dη(bin)〉 =24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5",

author = "B. Abelev and Hans B{\o}ggild and Ian Bearden and Christensen, {Christian Holm} and Dalsgaard, {Hans Hjersing} and Gulbrandsen, {Kristjan Herlache} and Gaardh{\o}je, {Jens J{\o}rgen} and Nielsen, {B{\o}rge Svane} and Casper Nygaard and Carsten S{\o}gaard",

year = "2012",

month = jun,

day = "6",

language = "English",

volume = "712",

pages = "165--175",

journal = "Physics Letters B: Particle Physics, Nuclear Physics and Cosmology",

issn = "0370-2693",

publisher = "Elsevier",

number = "6",

}

TY - JOUR

T1 - J/¿ production as a function of charged particle multiplicity in pp collisions at v s = 7 TeV

AU - Abelev, B.

AU - Bøggild, Hans

AU - Bearden, Ian

AU - Christensen, Christian Holm

AU - Dalsgaard, Hans Hjersing

AU - Gulbrandsen, Kristjan Herlache

AU - Gaardhøje, Jens Jørgen

AU - Nielsen, Børge Svane

AU - Nygaard, Casper

AU - Søgaard, Carsten

PY - 2012/6/6

Y1 - 2012/6/6

N2 - The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dNch/dη in pp collisions at s=7TeV at the LHC. J/ψ particles are detected for pt>0, in the rapidity interval |y|<0.9 via decay into e+e-, and in the interval 2.5+μ- pairs. An approximately linear increase of the J/ψ yields normalized to their event average (dNJ/ψ/dy)/〈 dNJ/ψ/dy〉 with (dNch/dη)/〈 dNch/dη〉 is observed in both rapidity ranges, where dNch/dη is measured within |η|<1 and pt>0. In the highest multiplicity interval with 〈 dNch/dη(bin)〉 =24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5

AB - The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dNch/dη in pp collisions at s=7TeV at the LHC. J/ψ particles are detected for pt>0, in the rapidity interval |y|<0.9 via decay into e+e-, and in the interval 2.5+μ- pairs. An approximately linear increase of the J/ψ yields normalized to their event average (dNJ/ψ/dy)/〈 dNJ/ψ/dy〉 with (dNch/dη)/〈 dNch/dη〉 is observed in both rapidity ranges, where dNch/dη is measured within |η|<1 and pt>0. In the highest multiplicity interval with 〈 dNch/dη(bin)〉 =24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5

M3 - Journal article

SN - 0370-2693

VL - 712

SP - 165

EP - 175

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

IS - 6

ER -

J/¿ production as a function of charged particle multiplicity in pp collisions at v s = 7 TeV

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