Journal article
Measurement of Prompt ψ(2S) to J/ψ Yield Ratios in Pb-Pb and p-p Collisions at √s[subscript NN] = 2.76 TeV
Physical Review Letters, Vol.113, 262301
12/31/2014
DOI: 10.1103/PhysRevLett.113.262301
Abstract
The ratio between the prompt $\psi(2\mathrm{S})$ and $\mathrm{J}/\psi$ yields, reconstructed via their decays into $\mu^+\mu^-$, is measured in $\mathrm{Pb}\mathrm{Pb}$ and $\mathrm{p}\mathrm{p}$ collisions at $\sqrt{s_\mathrm{NN}} = 2.76~\mathrm{TeV}$. The analysis is based on $\mathrm{Pb}\mathrm{Pb}$ and $\mathrm{p}\mathrm{p}$ data samples collected by CMS at the LHC, corresponding to integrated luminosities of $150~\mu\mathrm{b}^{-1}$ and $5.4~\mathrm{pb}^{-1}$, respectively. The double ratio of measured yields, $(N_{\psi(2\mathrm{S})} / N_{\mathrm{J}/\psi})_{\mathrm{Pb}\mathrm{Pb}} / (N_{\psi(2\mathrm{S})} / N_{\mathrm{J}/\psi})_{\mathrm{p}\mathrm{p}}$, is computed in three $\mathrm{Pb}\mathrm{Pb}$ collision centrality bins and two kinematic ranges: one at midrapidity, $|y|$ < $1.6$, covering the transverse momentum range $6.5$ < $p_{\mathrm{T}}$ < $30~\mathrm{GeV}/c$, and the other at forward rapidity, $1.6$ < $|y|$ < $2.4$, extending to lower $p_{\mathrm{T}}$ values, $3$ < $p_{\mathrm{T}}$ < $30~\mathrm{GeV}/c$. The centrality-integrated double ratio changes from $0.45 \pm 0.13~\mathrm{(stat)} \pm 0.07~\mathrm{(syst)}$ in the first range to $1.67 \pm 0.34~\mathrm{(stat)} \pm 0.27~\mathrm{(syst)}$ in the second. This difference is most pronounced in the most central collisions.
The ratio between the prompt <mml:math display="inline">ψ<mml:mo stretchy="false">(</mml:mo>2S<mml:mo stretchy="false">)</mml:mo></mml:math> and <mml:math display="inline">J<mml:mo stretchy="false">/</mml:mo>ψ</mml:math> yields, reconstructed via their decays into <mml:math display="inline">μ+μ-</mml:math>, is measured in Pb-Pb and <mml:math display="inline">p</mml:math>-<mml:math display="inline">p</mml:math> collisions at <mml:math display="inline">sNN=2.76 TeV</mml:math>. The analysis is based on Pb-Pb and <mml:math display="inline">p</mml:math>-<mml:math display="inline">p</mml:math> data samples collected by CMS at the Large Hadron Collider, corresponding to integrated luminosities of <mml:math display="inline">150 μ<mml:mi mathvariant="normal">b</mml:mi>-1</mml:math> and <mml:math display="inline">5.4 pb-1</mml:math>, respectively. The double ratio of measured yields <mml:math display="inline"><mml:mo stretchy="false">(</mml:mo>Nψ<mml:mo stretchy="false">(</mml:mo>2S<mml:mo stretchy="false">)</mml:mo><mml:mo stretchy="false">/</mml:mo>NJ<mml:mo stretchy="false">/</mml:mo>ψ<mml:mo stretchy="false">)</mml:mo>Pb-Pb<mml:mo stretchy="false">/</mml:mo><mml:mspace linebreak="goodbreak"/><mml:mo stretchy="false">(</mml:mo>Nψ<mml:mo stretchy="false">(</mml:mo>2S<mml:mo stretchy="false">)</mml:mo><mml:mo stretchy="false">/</mml:mo>NJ<mml:mo stretchy="false">/</mml:mo>ψ<mml:mo stretchy="false">)</mml:mo>p-p</mml:math> is computed in three Pb-Pb collision centrality bins and two kinematic ranges: one at midrapidity, <mml:math display="inline"><mml:mo stretchy="false">|</mml:mo>y<mml:mo stretchy="false">|</mml:mo><1.6</mml:math>, covering the transverse momentum range <mml:math display="inline">6.5<pT<30 GeV/c</mml:math>, and the other at forward rapidity, <mml:math display="inline">1.6<<mml:mo stretchy="false">|</mml:mo>y<mml:mo stretchy="false">|</mml:mo><2.4</mml:math>, extending to lower <mml:math display="inline">pT</mml:math> values, <mml:math display="inline">3<pT<30 GeV/c</mml:math>. The centrality-integrated double ratio changes from <mml:math display="inline">0.45±0.13<mml:mo stretchy="false">(</mml:mo>stat<mml:mo stretchy="false">)</mml:mo>±0.07<mml:mo stretchy="false">(</mml:mo>syst<mml:mo stretchy="false">)</mml:mo></mml:math> in the first range to <mml:math display="inline">1.67±0.34<mml:mo stretchy="false">(</mml:mo>stat<mml:mo stretchy="false">)</mml:mo>±0.27<mml:mo stretchy="false">(</mml:mo>syst<mml:mo stretchy="false">)</mml:mo></mml:math> in the second. This difference is most pronounced in the most central collisions.
The ratio between the prompt psi(2S) and J/psi yields, reconstructed via their decays into muon pairs, is measured in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC, corresponding to integrated luminosities of 150 inverse microbarns and 5.4 inverse picobarns, respectively. The double ratio of measured yields, (N[psi(2S)]/N[J/psi])[PbPb] / (N[psi(2S)]/ N[J/psi])[pp], is computed in three PbPb collision centrality bins and two kinematic ranges: one at midrapidity, abs(y) < 1.6, covering the transverse momentum range 6.5 < pt < 30 GeV/c, and the other at forward rapidity, 1.6 < abs(y) < 2.4, extending to lower pt values, 3 < pt < 30 GeV/c. The centrality-integrated double ratio changes from 0.45 +/- 0.13 (stat) +/- 0.07 (syst) in the first range to 1.67 +/- 0.34 (stat) +/- 0.27 (syst) in the second. This difference is most pronounced in the most central collisions.
Details
- Title: Subtitle
- Measurement of Prompt ψ(2S) to J/ψ Yield Ratios in Pb-Pb and p-p Collisions at √s[subscript NN] = 2.76 TeV
- Creators
- Vardan KhachatryanCécile Caillol - Université Libre de BruxellesBarbara Clerbaux - Université Libre de BruxellesGilles LentdeckerDidar Dobur - Université Libre de BruxellesLaurent Favart - Université Libre de BruxellesArnaud GayAnastasia Grebenyuk - Université Libre de BruxellesAlexandre Leonard - Université Libre de BruxellesAbdollah Mohammadi - Université Libre de BruxellesLuca Pernie - Université Libre de BruxellesThomas Reis - Université Libre de BruxellesTomislav Seva - Université Libre de BruxellesLaurent Thomas - Université Libre de BruxellesCatherine Vander VeldePascal Vanlaer - Université Libre de BruxellesJian WangCMS Collaboration
- Contributors
- Yasar Onel (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Physical Review Letters, Vol.113, 262301
- DOI
- 10.1103/PhysRevLett.113.262301
- ISSN
- 0031-9007
- Publisher
- American Physical Society
- Grant note
- DOI: 10.13039/100001558, name: Concern Foundation; DOI: 10.13039/501100003413, name: Bundesministerium für Wissenschaft, Forschung und Wirtschaft; DOI: 10.13039/501100002428, name: Austrian Science Fund; DOI: 10.13039/501100002661, name: Fonds De La Recherche Scientifique - FNRS; DOI: 10.13039/501100003130, name: Fonds Wetenschappelijk Onderzoek; DOI: 10.13039/501100003593, name: Conselho Nacional de Desenvolvimento Científico e Tecnológico; DOI: 10.13039/501100002322, name: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; DOI: 10.13039/501100004586, name: Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro; DOI: 10.13039/501100001807, name: São Paulo Research Foundation; DOI: 10.13039/501100001809, name: National Natural Science Foundation of China; DOI: 10.13039/100007637, name: Departamento Administrativo de Ciencia, Tecnologia e Innovacion; DOI: 10.13039/100001570, name: CS Fund; DOI: 10.13039/501100001810, name: Research Promotion Foundation; DOI: 10.13039/501100000090, name: Mountain Equipment Co-op; DOI: 10.13039/100001169, name: Hispanics in Philanthropy; DOI: 10.13039/501100002347, name: Bundesministerium für Bildung und Forschung; DOI: 10.13039/501100001659, name: Deutsche Forschungsgemeinschaft; DOI: 10.13039/100003872, name: Human Growth Foundation; DOI: 10.13039/501100003448, name: General Secretariat for Research and Technology; DOI: 10.13039/501100003549, name: Országos Tudományos Kutatási Alapprogramok; DOI: 10.13039/501100001502, name: Department of Atomic Energy, Government of India; DOI: 10.13039/501100001409, name: Department of Science and Technology, Ministry of Science and Technology; DOI: 10.13039/501100004152, name: Instituto Politécnico de Macau; DOI: 10.13039/501100001602, name: Science Foundation Ireland; DOI: 10.13039/501100004007, name: Istituto Nazionale di Fisica Nucleare; DOI: 10.13039/501100003725, name: National Research Foundation of Korea; DOI: 10.13039/100007176, name: Western Carolina University; DOI: 10.13039/501100003562, name: Ministry of Environment; DOI: 10.13039/501100004386, name: University of Malaya; DOI: 10.13039/501100003141, name: Consejo Nacional de Ciencia y Tecnología; DOI: 10.13039/501100004629, name: Ministry for Business Innovation and Employment; DOI: 10.13039/501100001868, name: National Science Council Taiwan; DOI: 10.13039/100006129, name: Fuel Cycle Technologies; DOI: 10.13039/501100003822, name: Joint Institute for Nuclear Research; DOI: 10.13039/501100002674, name: Russian Academy of Sciences; DOI: 10.13039/501100002261, name: Russian Foundation for Basic Research; DOI: 10.13039/501100004192, name: National Science and Technology Development Agency; DOI: 10.13039/501100002602, name: Pyeongtaek University; DOI: 10.13039/501100004742, name: National Academy of Sciences of Ukraine; DOI: 10.13039/501100000271, name: Science and Technology Facilities Council; DOI: 10.13039/100000015, name: U.S. Department of Energy; DOI: 10.13039/100000001, name: National Science Foundation; name: MES; name: MoST, ; name: MSES; name: MoER; name: ERC IUT; DOI: 10.13039/501100008530, name: ERDF; name: CEA; name: CNRS/IN2P3; name: LAS; DOI: 10.13039/501100008688, name: CINVESTAV; name: SEP; name: UASLP-FAI; DOI: 10.13039/501100008689, name: PAEC; name: MSHE; name: MON; DOI: 10.13039/501100008687, name: RosAtom; name: MESTD; DOI: 10.13039/501100007136, name: SEIDI; name: CPAN; name: MST; name: ThEPCenter; name: IPST; name: STAR; name: TUBITAK; DOI: 10.13039/501100008690, name: SFFR
- Language
- English
- Date published
- 12/31/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199800102771
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