Compact Muon Solenoid
LHC, CERN
Visit us: CMS Public Website, CMS Physics ;
Contact us: CMS Publications Committee
| CMS-PAS-HIN-16-015 | ||
| Measurement of $\psi(2S)$ production in proton-lead and proton-proton collisions at $\sqrt{ s _{\mathrm{NN}} } = $ 5.02 TeV | ||
| CMS Collaboration | ||
| February 2017 | ||
| Abstract: This note reports the measurement of prompt $\psi$(2S) production in proton-lead (pPb) and proton-proton (pp) collisions at $\sqrt{ s _{\mathrm{NN}} } = $ 5.02 TeV. The results are based on pPb and pp data samples collected by CMS at the LHC corresponding to an integrated luminosity of 34.6 nb$^{-1}$ and 28.0 pb$^{-1}$ respectively. The nuclear modification factor, $R_{\rm pPb}$, is calculated for prompt $\psi$(2S) in the kinematic interval 4 $ < p_{\mathrm{T}} < $ 30 GeV/$c$ and $-2.4 < y_{\rm CM} < 1.93$, and compared to the $R_{\rm pPb}$ of prompt $J/\psi$. The $R_{\rm pPb}$ of the excited state is found to be smaller than the $R_{\rm pPb}$ of the ground state, over the whole kinematic range studied. The suppression is more pronounced in the region of negative rapidity and $p_{\mathrm{T}} < $ 10 GeV/$c$. | ||
|
Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PLB 790 (2019) 509. The superseded preliminary plots can be found here. |
||
| Figures | |
png pdf |
Figure 1:
(Left) Fit of the dimuon mass distribution both to the $ \mathrm{J} / \psi $ and $ \psi $(2S) peaks of the pPb data in the kinematical bin $-2.4 < y_{\rm CM} < -1.93$ and 4 $ < {p_{\mathrm {T}}} < $ 6.5 GeV/$c$. The signal is fitted with Crystal Ball and Gaussian functions and background is described with a Chebyshev polynomial of degree 3. (Right) Fit of the dimuon mass distribution both to the $ \mathrm{J} / \psi $ and $ \psi $(2S) peaks of the pPb data in the kinematical bin 0 $ < y_{\rm CM} < $ 0.9 and 10 $ < {p_{\mathrm {T}}} < $ 30 GeV/$c$. The signal is fitted with Crystal Ball and Gaussian functions and background is described with a Chebyshev polynomial of degree 3. |
png pdf |
Figure 1-a:
Fit of the dimuon mass distribution both to the $ \mathrm{J} / \psi $ and $ \psi $(2S) peaks of the pPb data in the kinematical bin $-2.4 < y_{\rm CM} < -1.93$ and 4 $ < {p_{\mathrm {T}}} < $ 6.5 GeV/$c$. The signal is fitted with Crystal Ball and Gaussian functions and background is described with a Chebyshev polynomial of degree 3. |
png pdf |
Figure 1-b:
Fit of the dimuon mass distribution both to the $ \mathrm{J} / \psi $ and $ \psi $(2S) peaks of the pPb data in the kinematical bin 0 $ < y_{\rm CM} < $ 0.9 and 10 $ < {p_{\mathrm {T}}} < $ 30 GeV/$c$. The signal is fitted with Crystal Ball and Gaussian functions and background is described with a Chebyshev polynomial of degree 3. |
png pdf |
Figure 2:
Rapidity dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in three $ {p_{\mathrm {T}}} $ ranges. The error bars represent the statistical uncertainties, and the boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} = $ 1. |
png pdf |
Figure 2-a:
Rapidity dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in the 4 $ < {p_{\mathrm {T}}} < $ 6.5 GeV/$c$ range. The error bars represent the statistical uncertainties, and the boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} = $ 1. |
png pdf |
Figure 2-b:
Rapidity dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in the 6.6 $ < {p_{\mathrm {T}}} < $ 10 GeV/$c$ range. The error bars represent the statistical uncertainties, and the boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} = $ 1. |
png pdf |
Figure 2-c:
Rapidity dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in the 10 $ < {p_{\mathrm {T}}} < $ 30 GeV/$c$ range. The error bars represent the statistical uncertainties, and the boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} = $ 1. |
png pdf |
Figure 3:
Transverse momentum $ {p_{\mathrm {T}}} $ dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in four rapidity ranges. The error bars represent the statistical uncertainties, and the shaded boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} $ = 1. |
png pdf |
Figure 3-a:
Transverse momentum $ {p_{\mathrm {T}}} $ dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in rapidity range $-2.4 < y_{\rm CM} < -1.93$. The error bars represent the statistical uncertainties, and the shaded boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} $ = 1. |
png pdf |
Figure 3-b:
Transverse momentum $ {p_{\mathrm {T}}} $ dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in rapidity ranges $-1.93 < y_{\rm CM} < -1.5$ and $1.5 < y_{\rm CM} < 1.93 $. The error bars represent the statistical uncertainties, and the shaded boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} $ = 1. |
png pdf |
Figure 3-c:
Transverse momentum $ {p_{\mathrm {T}}} $ dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in rapidity ranges $-1.5 < y_{\rm CM} < -0.9 $ and $0.9 < y_{\rm CM} < 1.5 $. The error bars represent the statistical uncertainties, and the shaded boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} $ = 1. |
png pdf |
Figure 3-d:
Transverse momentum $ {p_{\mathrm {T}}} $ dependence of $ {R_{ \mathrm{pPb} }} $ for prompt $ \psi $(2S) in rapidity ranges $-0.9 < y_{\rm CM} < 0$ and $0 < y_{\rm CM} < 0.9 $. The error bars represent the statistical uncertainties, and the shaded boxes show the quadratic sum of systematic uncertainties. The fully correlated global uncertainty of 4.2% is displayed as a grey box arround $ {R_{ \mathrm{pPb} }} $ = 1. |
| Summary |
| The pPb and pp collision data at ${\sqrt{s_{_{\text{NN}}}}} = $ 5.02 TeV taken by the CMS detector are used to investigate the production of prompt $\psi$(2S). The results are based on pPb and pp data samples collected by CMS at the LHC corresponding to an integrated luminosity of 34.6 nb$^{-1}$ and 28.0 pb$^{-1}$ respectively. The nuclear modification factor of prompt $\psi$(2S) is determined in the kinematic interval 4 $ < p_{\mathrm{T}} < $ 30 GeV/$c$ and $-2.4 < y_{\rm CM} < $ 1.93, and compared to the $ R_{\rm pPb}$ of prompt $ \mathrm{J}/ \psi $. The suppression is more pronounced in the region of negative rapidity and at $ p_{\mathrm{T}} < $ 10 GeV/$c$. The ${R_{\mathrm{pPb}}} $ of $\psi$(2S) is also found to be smaller to that of the $ \mathrm{J}/ \psi $ measured in Ref. [18], over the whole kinematic range studied. The different nuclear dependence of $ \mathrm{J}/ \psi $ and $\psi$(2S) reported here cannot be attributed to nPDF or coherent energy loss effects which predict a similar suppression in both channels. It may however be consistent with the picture of final state inelastic interaction of $\psi$(2S) mesons in the medium produced in pPb collisions at ${\sqrt{s_{_{\text{NN}}}}} = $ 5 TeV. |
| References | ||||
| 1 | T. Matsui and H. Satz | $ \mathrm{J} / \psi $ Suppression by Quark-Gluon Plasma Formation | PLB 178 (1986) 416 | |
| 2 | NA38 Collaboration | The Production of $ \mathrm{J} / \psi $ in 200-GeV/nucleon Oxygen Uranium Interactions | PLB 220 (1989) 471--478 | |
| 3 | NA50 Collaboration | Anomalous $ \mathrm{J} / \psi $ suppression in Pb-Pb interactions at 158 GeV/$c$ per nucleon | PLB 410 (1997) 337--343 | |
| 4 | PHENIX Collaboration | $ \mathrm{J} / \psi $ production versus centrality, transverse momentum, and rapidity in AuAu collisions at $ \sqrt{ s_{\mathrm{NN}} } = $ 200 GeV | PRL 98 (2007) 232301 | nucl-ex/0611020 |
| 5 | PHENIX Collaboration | $ \mathrm{J} / \psi $ suppression at forward rapidity in Au+Au collisions at $ \sqrt{ s_{\mathrm{NN}} } = $ 200 GeV | PRC 84 (2011) 054912 | 1103.6269 |
| 6 | ALICE Collaboration | Centrality, rapidity and transverse momentum dependence of $ \mathrm{J} / \psi $ suppression in Pb-Pb collisions at $ \sqrt{s_{\rm NN}} = $ 2.76 TeV | PLB 734 (2014) 314--327 | 1311.0214 |
| 7 | CMS Collaboration | Indications of suppression of excited $ \Upsilon $ states in PbPb collisions at $ \sqrt{S_{NN}} $ = 2.76 TeV | PRL 107 (2011) 052302 | CMS-HIN-11-007 1105.4894 |
| 8 | CMS Collaboration | Observation of sequential Upsilon suppression in PbPb collisions | PRL 109 (2012) 222301 | CMS-HIN-11-011 1208.2826 |
| 9 | CMS Collaboration | Suppression of non-prompt $ \mathrm{J} / \psi $, prompt $ \mathrm{J} / \psi $, and $ \Upsilon $(1S) in PbPb collisions at $ \sqrt{s_{NN}}= $ 2.76 TeV | JHEP 05 (2012) 063 | CMS-HIN-10-006 1201.5069 |
| 10 | V. Kumar, P. Shukla, and R. Vogt | Quarkonia suppression in PbPb collisions at $ \sqrt{s_{NN}} =$ 2.76 TeV | PRC92 (2015), no. 2, 024908 | 1410.3299 |
| 11 | E. Ferreiro, F. Fleuret, J. Lansberg, and A. Rakotozafindrabe | Impact of the Nuclear Modification of the Gluon Densities on $ \mathrm{J} / \psi $ production in pPb collisions at $ \sqrt{ s_{\mathrm{NN}} }= $ 5 TeV | PRC 88 (2013) 047901 | 1305.4569 |
| 12 | R. Vogt | Shadowing effects on $ \mathrm{J} / \psi $ and $ \Upsilon $ production at energies available at the CERN Large Hadron Collider | PRC 92 (2015) 034909 | 1507.04418 |
| 13 | F. Arleo and S. Peign\'e | $ \mathrm{J} / \psi $ suppression in p-A collisions from parton energy loss in cold QCD matter | PRL 109 (2012) 122301 | 1204.4609 |
| 14 | F. Arleo, R. Kolevatov, S. Peign\'e, and M. Rustamova | Centrality and $ p_{\mathrm{T}} $ dependence of $ \mathrm{J} / \psi $ suppression in proton-nucleus collisions from parton energy loss | JHEP 05 (2013) 155 | 1304.0901 |
| 15 | ALICE Collaboration | $ \mathrm{J} / \psi $ production and nuclear effects in p-Pb collisions at $ \sqrt{ s_{\mathrm{NN}} }= $ 5.02 TeV | JHEP 02 (2014) 073 | 1308.6726 |
| 16 | ALICE Collaboration | Rapidity and transverse-momentum dependence of the inclusive $ \mathrm{J} / \psi $ nuclear modification factor in p-Pb collisions at $ \sqrt{ s_{\mathrm{NN}} }= $ 5.02 TeV | JHEP 06 (2015) 055 | 1503.07179 |
| 17 | ATLAS Collaboration | Measurement of differential $ \mathrm{J} / \psi $ production cross sections and forward-backward ratios in p+Pb collisions with the ATLAS detector | PRC 92 (2015) 034904 | 1505.08141 |
| 18 | CMS Collaboration | $ \mathrm{J} / \psi $ production in p Pb collisions | To be submitted to EPJC(2017) | |
| 19 | LHCb Collaboration | Study of $ \mathrm{J} / \psi $ production and cold nuclear matter effects in pPb collisions at $ \sqrt{ s_{\mathrm{NN}} }= $ 5 TeV | JHEP 02 (2014) 072 | 1308.6729 |
| 20 | ALICE Collaboration | Production of inclusive $ \Upsilon $(1S) and $ \Upsilon $(2S) in p-Pb collisions at $ {\sqrt{s_{{\rm NN}}} } = $ 5.02 TeV | PLB 740 (2015) 105--117 | 1410.2234 |
| 21 | LHCb Collaboration | Study of $ \Upsilon $ production and cold nuclear matter effects in pPb collisions at $ \sqrt{s_{NN}} = $ 5 TeV | JHEP 07 (2014) 094 | 1405.5152 |
| 22 | ALICE Collaboration | Suppression of $ \psi $(2S) production in p-Pb collisions at $ \sqrt{s_{\rm NN}} = $ 5.02 TeV | JHEP 12 (2014) 073 | 1405.3796 |
| 23 | LHCb Collaboration | Study of $ \psi(2S) $ production and cold nuclear matter effects in pPb collisions at $ \sqrt{s_{NN}}= $ 5 TeV | JHEP 03 (2016) 133 | 1601.07878 |
| 24 | E. G. Ferreiro | Excited charmonium suppression in proton–nucleus collisions as a consequence of comovers | PLB 749 (2015) 98--103 | 1411.0549 |
| 25 | CMS Collaboration | Event activity dependence of Y(nS) production in $ \sqrt{s_{NN}} = $ 5.02 TeV pPb and $ \sqrt{s} = $ 2.76 TeV pp collisions | JHEP 04 (2014) 103 | CMS-HIN-13-003 1312.6300 |
| 26 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
| 27 | CMS Collaboration | Performance of CMS muon reconstruction in pp collision events at $ \sqrt{s}= $ 7 TeV | JINST 7 (2012) P10002 | CMS-MUO-10-004 1206.4071 |
| 28 | CMS Collaboration | Measurement of Prompt $ \psi' $ to $ \mathrm{J} / \psi $ Yield Ratios in Pb-Pb and p-p Collisions at $ \sqrt{s_{NN}}= $ 2.76 €‰TeV | PRL 113 (2014), no. 26, 262301 | CMS-HIN-12-007 1410.1804 |
| 29 | CMS Collaboration | Relative modification of prompt $ \psi' $ and $ \mathrm{J} / \psi $ yields from pp to PbPb collisions at $ {\sqrt{s_{\mathrm{NN}}}}= $ 5.02 TeV | Submitted to: PRL (2016) | CMS-HIN-16-004 1611.01438 |
| 30 | W. Verkerke and D. P. Kirkby | The RooFit toolkit for data modeling | eConf C0303241 (2003) MOLT007, [,186(2003)] | physics/0306116 |
| 31 | Particle Data Group, J. Beringer et al. | Review of Particle Physics | PRD 86 (2012) 010001 | |
| 32 | ALEPH Collaboration | Measurement of the $ \overline{\mathrm{B}}^0 $ and $ \mathrm{B}^- $ meson lifetimes | PLB 307 (1993) 194 | |
| 33 | ALEPH Collaboration | Errata: Measurement of the $ \overline{\mathrm{B}}^0 $ and $ \mathrm{B}^- $ meson lifetimes | PLB 325 (1994) 537 | |
| 34 | T. Sjostrand, S. Mrenna, and P. Skands | PYTHIA 6.4 physics and manual | JHEP 05 (2006) 026 | hep-ph/0603175 |
| 35 | T. Sjostrand, S. Mrenna, and P. Skands | A Brief Introduction to PYTHIA 8.1 | CPC 178 (2008) 852--867 | 0710.3820 |
| 36 | CMS Collaboration | Measurement of the prompt $ \mathrm{J} / \psi $ and $ \psi' $ polarizations in pp collisions at $ \sqrt{s} = $ 7 TeV | PLB 727 (2013) 381 | CMS-BPH-13-003 1307.6070 |
| 37 | E. Barberio, B. van Eijk, and Z. Was | PHOTOS: A Universal Monte Carlo for QED radiative corrections in decays | CPC 66 (1991) 115--128 | |
| 38 | GEANT4 Collaboration | GEANT4: A Simulation toolkit | NIMA506 (2003) 250--303 | |
| 39 | CMS Collaboration | Measurements of Inclusive W and Z Cross Sections in pp Collisions at $ \sqrt{s}= $ 7 TeV | JHEP 01 (2011) 080 | CMS-EWK-10-002 1012.2466 |
|
|
Compact Muon Solenoid LHC, CERN |
|
|
|
|
|
|