Compact Muon Solenoid
LHC, CERN
Visit us: CMS Public Website, CMS Physics ;
Contact us: CMS Publications Committee
| CMS-PAS-FTR-18-025 | ||
| Performance of jet quenching measurements in pp and PbPb collisions with CMS at the HL-LHC | ||
| CMS Collaboration | ||
| December 2018 | ||
| Abstract: The projected performance of different jet measurements to be carried out with the large data samples expected in PbPb and pp collisions during the high-luminosity phase of the LHC (HL-LHC) is presented. The analyses are based on Monte Carlo simulations and extrapolations from data collected in pp and PbPb collisions between 2010 and 2016. The extrapolated performance for PbPb collisions, corresponding to an integrated luminosity of 10 nb$^{-1}$ at $\sqrt{s_{_\textrm{NN}}}=$ 5.02 TeV and an upgraded CMS detector, shows significant reductions in the uncertainties of the measurements of photon-tagged jet shapes and D$^0$-jet correlations. The large proton-proton data sample at $\sqrt{s}=$ 14 TeV, to be collected under low-pileup conditions in Run 3 and beyond, will also provide new opportunities for the study of jet quenching phenomena in small systems, as shown through $\gamma$, Z-jet transverse momentum imbalance distributions in high-multiplicity pp events. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
png pdf |
Figure 1:
Ratio of the density of particles produced at a radius $r$ in photon-tagged jets in PbPb (0-10% most central) and pp collisions. The left panel shows the expected distribution at the HL-LHC with the error bars (bands) indicating statistical (systematic) uncertainties. The right panel shows a comparison of the current total uncertainty in the 2015 data (grey bands) [17] to the projected HL-LHC total uncertainty (violet bands). |
png pdf |
Figure 1-a:
Ratio of the density of particles produced at a radius $r$ in photon-tagged jets in PbPb (0-10% most central) and pp collisions. The panel shows the expected distribution at the HL-LHC with the error bars (bands) indicating statistical (systematic) uncertainties. |
png pdf |
Figure 1-b:
Ratio of the density of particles produced at a radius $r$ in photon-tagged jets in PbPb (0-10% most central) and pp collisions. The panel shows a comparison of the current total uncertainty in the 2015 data (grey bands) [17] to the projected HL-LHC total uncertainty (violet bands). |
png pdf |
Figure 2:
Left: Projected distributions of ${\mathrm {D}^{0}}$ mesons with ${{p_{\mathrm {T}}} ^\mathrm {D}} = $ 4-20 GeV/$c$ (top) and $ {{p_{\mathrm {T}}} ^\mathrm {D}} > $ 20 GeV/$c$ (bottom), as a function of their distance $r$ from the jet axis (for jets of $ {{p_{\mathrm {T}}} ^\mathrm {jet}} > $ 60 GeV/$c$ and $|\eta ^{\mathrm {jet}}| < $1.6) in pp and PbPb collisions at $\sqrt {s_{NN}}=$ 5.02 TeV at the HL-LHC. The error bands (error bars, barely seen) indicate systematic (statistical) uncertainties. The horizontal bars indicate the size of the bin width. Right: Same distributions as on the left, comparing the current total uncertainty (wide bands) [36] and the projected total uncertainty (thin bands). |
png pdf |
Figure 2-a:
Left: Projected distributions of ${\mathrm {D}^{0}}$ mesons with ${{p_{\mathrm {T}}} ^\mathrm {D}} = $ 4-20 GeV/$c$, as a function of their distance $r$ from the jet axis (for jets of $ {{p_{\mathrm {T}}} ^\mathrm {jet}} > $ 60 GeV/$c$ and $|\eta ^{\mathrm {jet}}| < $1.6) in pp and PbPb collisions at $\sqrt {s_{NN}}=$ 5.02 TeV at the HL-LHC. The error bands (error bars, barely seen) indicate systematic (statistical) uncertainties. The horizontal bars indicate the size of the bin width. Right: Same distribution as on the left, comparing the current total uncertainty (wide bands) [36] and the projected total uncertainty (thin bands). |
png pdf |
Figure 2-b:
Left: Projected distributions of ${\mathrm {D}^{0}}$ mesons with $ {{p_{\mathrm {T}}} ^\mathrm {D}} > $ 20 GeV/$c$, as a function of their distance $r$ from the jet axis (for jets of $ {{p_{\mathrm {T}}} ^\mathrm {jet}} > $ 60 GeV/$c$ and $|\eta ^{\mathrm {jet}}| < $1.6) in pp and PbPb collisions at $\sqrt {s_{NN}}=$ 5.02 TeV at the HL-LHC. The error bands (error bars, barely seen) indicate systematic (statistical) uncertainties. The horizontal bars indicate the size of the bin width. Right: Same distribution as on the left, comparing the current total uncertainty (wide bands) [36] and the projected total uncertainty (thin bands). |
png pdf |
Figure 3:
Left: Projected ratios at the HL-LHC of the radial distributions of ${\mathrm {D}^{0}}$ mesons produced in PbPb over pp collisions at $\sqrt {s_{NN}} = $ 5.02 TeV, for ${{p_{\mathrm {T}}} ^\mathrm {D}} = $ 4-20 GeV/$c$ (top) and $ {{p_{\mathrm {T}}} ^\mathrm {D}} > $ 20 GeV/$c$ (bottom). The error bars (bands) indicate statistical (systematic) uncertainties. The horizontal bars indicate the size of the bin width. Rigth: Same distributions as on the left, comparing the current total uncertainty (grey bands) [36] and the projected total uncertainty at the HL-LHC (yellow bands). |
png pdf |
Figure 3-a:
Left: Projected ratios at the HL-LHC of the radial distributions of ${\mathrm {D}^{0}}$ mesons produced in PbPb over pp collisions at $\sqrt {s_{NN}} = $ 5.02 TeV, for ${{p_{\mathrm {T}}} ^\mathrm {D}} = $ 4-20 GeV/$c$. The error bars (bands) indicate statistical (systematic) uncertainties. The horizontal bars indicate the size of the bin width. Rigth: Same distribution as on the left, comparing the current total uncertainty (grey bands) [36] and the projected total uncertainty at the HL-LHC (yellow bands). |
png pdf |
Figure 3-b:
Left: Projected ratios at the HL-LHC of the radial distributions of ${\mathrm {D}^{0}}$ mesons produced in PbPb over pp collisions at $\sqrt {s_{NN}} = $ 5.02 TeV, for $ {{p_{\mathrm {T}}} ^\mathrm {D}} > $ 20 GeV/$c$. The error bars (bands) indicate statistical (systematic) uncertainties. The horizontal bars indicate the size of the bin width. Rigth: Same distribution as on the left, comparing the current total uncertainty (grey bands) [36] and the projected total uncertainty at the HL-LHC (yellow bands). |
png pdf |
Figure 4:
Distributions of transverse momentum imbalance, $x_{j\gamma}$, in three different centrality classes of pp isolated-photon+jet events ($ {p_{\mathrm {T}}} ^{\gamma} > $ 60 GeV/$c$ and $|\eta _{\gamma}| < $ 1.44, $ {{p_{\mathrm {T}}} ^\mathrm {jet}} > $ 30 GeV/$c$ and $|\eta _{\rm jet}| < $ 1.6) with 200 (dashed line) and 2000 (solid line) pb$^{-1}$ integrated luminosities expected to be taken under low-pileup conditions at HL-LHC. The central values of the distributions are derived from existing measurements [43] combined with PYTHIA 8 MC simulations. The error bars (bands) indicate statistical (systematic) uncertainties. |
png pdf |
Figure 5:
Distributions of transverse momentum imbalance, $x_{jZ}$, in two different centrality classes of pp Z+jet events ($ {p_{\mathrm {T}}} ^{Z} > $ 60 GeV/$c$, $ {{p_{\mathrm {T}}} ^\mathrm {jet}} > $ 30 GeV/$c$ and $|\eta _{\rm jet}| < $ 1.6) with 200 (dashed line) and 2000 (solid line) pb$^{-1}$ integrated luminosities expected to be taken under low-pileup conditions at HL-LHC. The central values of the distributions are derived from existing measurements [38] combined with PYTHIA 8 MC. The error bars (bands) indicate statistical (systematic) uncertainties. |
| Summary |
| The projected performance of different jet measurements expected to be carried out with large data samples of PbPb and low-pileup pp collisions at HL-LHC are presented. The HL-LHC performance, extrapolated from existing PbPb data and Monte Carlo simulations, corresponding to a total integrated luminosity of 10 nb$^{-1}$ at ${\sqrt{s_{_{\text{NN}}}}} = $ 5.02 TeV, shows significantly improved precision in the measurements of photon-tagged jet shapes and $\mathrm{D}^{0}$-jet correlations. These measurements will provide new constraints on models of jet quenching in the QGP, heavy quark production and diffusion inside the medium, and improved understanding of the medium response and medium excitation to hard probes. The large pp data samples at ${\sqrt{s}} = $ 14 TeV with low pileup, expected to be collected in Run 3 and beyond, will also provide precise measurements of boson-jet transverse momentum imbalance distributions in (high-multiplicity) small systems, and thereby study the system-size dependence of jet quenching phenomena. |
| References | ||||
| 1 | H. A. Andrews et al. | Novel tools and observables for jet physics in heavy-ion collisions | 1808.03689 | |
| 2 | CMS Collaboration | The CMS Experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
| 3 | CMS Collaboration | Technical Proposal for the Phase-II Upgrade of the CMS Detector | CMS-PAS-TDR-15-002 | CMS-PAS-TDR-15-002 |
| 4 | CMS Collaboration | The Phase-2 Upgrade of the CMS Tracker | CDS | |
| 5 | CMS Collaboration | The Phase-2 Upgrade of the CMS Barrel Calorimeters Technical Design Report | CDS | |
| 6 | CMS Collaboration | The Phase-2 Upgrade of the CMS Endcap Calorimeter | CDS | |
| 7 | CMS Collaboration | The Phase-2 Upgrade of the CMS Muon Detectors | CDS | |
| 8 | CMS Collaboration | CMS Phase-2 Object Performance | ||
| 9 | CMS Collaboration | Technical Proposal for a MIP Timing Detector in the CMS experiment Phase 2 Upgrade | CDS | |
| 10 | CMS Collaboration | Modification of jet shapes in PbPb collisions at $ \sqrt {s_{NN}} = $ 2.76 TeV | PLB730 (2014) 243 | CMS-HIN-12-002 1310.0878 |
| 11 | CMS Collaboration | Measurement of jet fragmentation in PbPb and pp collisions at $ \sqrt{s_{NN}}= $ 2.76 TeV | PRC90 (2014) 024908 | CMS-HIN-12-013 1406.0932 |
| 12 | ATLAS Collaboration | Measurement of jet fragmentation in Pb+Pb and $ pp $ collisions at $ \sqrt{{s_\mathrm{NN}}} = $ 2.76 TeV with the ATLAS detector at the LHC | EPJC77 (2017) 379 | 1702.00674 |
| 13 | CMS Collaboration | Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV | PRC84 (2011) 024906 | CMS-HIN-10-004 1102.1957 |
| 14 | CMS Collaboration | Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at $ \sqrt{s_{\mathrm{NN}}}= $ 2.76 TeV | JHEP 01 (2016) 006 | CMS-HIN-14-010 1509.09029 |
| 15 | CMS Collaboration | Correlations between jets and charged particles in PbPb and pp collisions at $ \sqrt{s_{\mathrm{NN}}}= $ 2.76 TeV | JHEP 02 (2016) 156 | CMS-HIN-14-016 1601.00079 |
| 16 | CMS Collaboration | Decomposing transverse momentum balance contributions for quenched jets in PbPb collisions at $ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}= $ 2.76 TeV | JHEP 11 (2016) 055 | CMS-HIN-15-011 1609.02466 |
| 17 | CMS Collaboration | Jet shapes of isolated photon-tagged jets in PbPb and pp collisions at $ \sqrt{s_\mathrm{NN}} = $ 5.02 TeV | Submitted to: PRL (2018) | CMS-HIN-18-006 1809.08602 |
| 18 | CMS Collaboration | Observation of medium induced modifications of jet fragmentation in PbPb collisions using isolated-photon-tagged jets | CMS-HIN-16-014 1801.04895 |
|
| 19 | M. Nahrgang, J. Aichelin, P. B. Gossiaux, and K. Werner | Azimuthal correlations of heavy quarks in Pb + Pb collisions at $ \sqrt{s}= $ 2.76 TeV at the CERN Large Hadron Collider | PRC 90 (2014) 024907 | 1305.3823 |
| 20 | S. Cao, G.-Y. Qin, and S. A. Bass | Modeling of heavy-flavor pair correlations in Au-Au collisions at 200A GeV at the BNL Relativistic Heavy Ion Collider | PRC 92 (2015) 054909 | 1505.01869 |
| 21 | R. Hambrock and W. A. Horowitz | AdS/CFT predictions for azimuthal and momentum correlations of $ b\bar{b} $ pairs in heavy ion collisions | Nucl. Part. Phys. Proc. 289-290 (2017) 233 | 1703.05845 |
| 22 | ALICE Collaboration | Transverse momentum dependence of D-meson production in Pb-Pb collisions at $ \sqrt{s_{\rm NN}} = $ 2.76 TeV | JHEP 03 (2016) 081 | 1509.06888 |
| 23 | ALICE Collaboration | Centrality dependence of high-p$ _{T} $ D meson suppression in Pb-Pb collisions at $ \sqrt{s_{\mathrm{N}\mathrm{N}}}= $ 2.76 TeV | JHEP 11 (2015) 205 | 1506.06604 |
| 24 | CMS Collaboration | Nuclear modification factor of D$ ^0 $ mesons in PbPb collisions at $ \sqrt{s_\mathrm{NN}} = $ 5.02 TeV | PLB782 (2018) 474 | CMS-HIN-16-001 1708.04962 |
| 25 | CMS Collaboration | Measurement of the $ {B}^{\pm} $ Meson Nuclear Modification Factor in Pb-Pb Collisions at $ \sqrt{{s}_{NN}}=5.02\text{}\text{}\mathrm{TeV} $ | PRL 119 (2017) 152301 | CMS-HIN-16-011 1705.04727 |
| 26 | CMS Collaboration | Suppression and azimuthal anisotropy of prompt and nonprompt $ \mathrm{J}/\psi $ production in PbPb collisions at $ \sqrt{s_{\rm NN}} = $ 2.76 TeV | EPJC 77 (2017) 252 | CMS-HIN-14-005 1610.00613 |
| 27 | ALICE Collaboration | Azimuthal anisotropy of D meson production in Pb-Pb collisions at $ \sqrt{s_{\rm NN}} = $ 2.76 TeV | PRC 90 (2014) 034904 | 1405.2001 |
| 28 | CMS Collaboration | Measurement of prompt $ D^0 $ meson azimuthal anisotropy in Pb-Pb collisions at $ \sqrt{{s}_{NN}} = $ 5.02 TeV | PRL 120 (2018) 202301 | CMS-HIN-16-007 1708.03497 |
| 29 | STAR Collaboration | Measurement of $ D^0 $ Azimuthal Anisotropy at Midrapidity in Au+Au Collisions at $ \sqrt{s_{\mathrm{NN}}} = $ 200 GeV | PRL 118 (2017) 212301 | 1701.06060 |
| 30 | ALICE Collaboration | $ D $-meson azimuthal anisotropy in midcentral Pb-Pb collisions at $ {\sqrt{s_{\rm NN}}=5.02} $ TeV | PRL 120 (2018) 102301 | 1707.01005 |
| 31 | CMS Collaboration | Evidence of b-Jet Quenching in PbPb Collisions at $ \sqrt{s_{\mathrm{NN}}}= $ 2.76 TeV | PRL 113 (2014) 132301 | CMS-HIN-12-003 1312.4198 |
| 32 | CMS Collaboration | Comparing transverse momentum balance of b jet pairs in pp and PbPb collisions at $ \sqrt{s_\mathrm{NN}} = $ 5.02 TeV | JHEP 03 (2018) 181 | CMS-HIN-16-005 1802.00707 |
| 33 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_t $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 34 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet User Manual | EPJC72 (2012) 1896 | 1111.6097 |
| 35 | M. Cacciari and G. P. Salam | Dispelling the $ N^{3} $ myth for the $ k_t $ jet-finder | PLB641 (2006) 57 | hep-ph/0512210 |
| 36 | CMS Collaboration | Measurement of the radial profile of $ D^{0} $ mesons in jets produced in pp and PbPb collisions at 5.02 TeV | CMS-PAS-HIN-18-007 | |
| 37 | CMS Collaboration | Studies of dijet transverse momentum balance and pseudorapidity distributions in pPb collisions at $ \sqrt{s_{\mathrm{NN}}} = $ 5.02 TeV | EPJC74 (2014) 2951 | CMS-HIN-13-001 1401.4433 |
| 38 | CMS Collaboration | Study of Jet Quenching with $ Z+\text{jet} $ Correlations in Pb-Pb and $ pp $ Collisions at $ {\sqrt{s}_{\rm NN}}=$ 5.02 TeV | PRL 119 (2017) 082301 | CMS-HIN-15-013 1702.01060 |
| 39 | CMS Collaboration | Studies of jet quenching using isolated-photon+jet correlations in PbPb and $ pp $ collisions at $ \sqrt{s_{NN}}= $ 2.76 TeV | PLB718 (2013) 773 | CMS-HIN-11-010 1205.0206 |
| 40 | Y. Li and F. Petriello | Combining QCD and electroweak corrections to dilepton production in FEWZ | PRD86 (2012) 094034 | 1208.5967 |
| 41 | P. Aurenche et al. | A New critical study of photon production in hadronic collisions | PRD73 (2006) 094007 | hep-ph/0602133 |
| 42 | CMS Collaboration | Charged-particle nuclear modification factors in PbPb and pPb collisions at $ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}= $ 5.02 TeV | JHEP 04 (2017) 039 | CMS-HIN-15-015 1611.01664 |
| 43 | CMS Collaboration | Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at $ \sqrt{s_{_{\mathrm{NN}}}} = $ 5.02 TeV | PLB785 (2018) 14 | CMS-HIN-16-002 1711.09738 |
| 44 | T. Sjostrand et al. | An Introduction to PYTHIA 8.2 | CPC 191 (2015) 159 | 1410.3012 |
| 45 | CMS Collaboration | Event generator tunes obtained from underlying event and multiparton scattering measurements | EPJC76 (2016) 155 | CMS-GEN-14-001 1512.00815 |
|
|
Compact Muon Solenoid LHC, CERN |
|
|
|
|
|
|