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| CMS-HIN-16-024 ; CERN-EP-2018-097 | ||
| Measurement of the groomed jet mass in PbPb and pp collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV | ||
| CMS Collaboration | ||
| 14 May 2018 | ||
| JHEP 10 (2018) 161 | ||
| Abstract: A measurement of the groomed jet mass in PbPb and pp collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV with the CMS detector at the LHC is presented. Jet grooming is a recursive procedure which sequentially removes soft constituents of a jet until a pair of hard subjets is found. The resulting groomed jets can be used to study modifications to the parton shower evolution in the presence of the hot and dense medium created in heavy ion collisions. Predictions of groomed jet properties from the PYTHIA and HERWIG++ event generators agree with the measurements in pp collisions. When comparing the results from the most central PbPb collisions to pp data, a hint of an increase of jets with large jet mass is observed, which could originate from additional medium-induced radiation at a large angle from the jet axis. However, no modification of the groomed mass of the core of the jet is observed for all PbPb centrality classes. The PbPb results are also compared to predictions from the JEWEL and QPYTHIA event generators, which predict a large modification of the groomed mass not observed in the data. | ||
| Links: e-print arXiv:1805.05145 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | Summary | Additional Figures | References | CMS Publications |
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| Figures | |
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Figure 1:
Groomed jet momentum fraction $ {p_\mathrm {T,g}} $ in pp (left) and the 10% most central PbPb collisions (right) for jets with 140 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 160 GeV and $ < \eta _{\text {jet}} > <$ 1.3. The pp data are compared to simulation using the PYTHIA event generator and the PbPb data are compared to the same PYTHIA events embedded in PbPb events simulated with the HYDJET event generator. Vertical lines indicate size of statistical uncertainty. The parameters used for the SD algorithm are $ {z_{\text {cut}}} = $ 0.5, $\beta = $ 1.5. The jets are selected based on the ungroomed jet transverse momentum. |
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Figure 1-a:
Groomed jet momentum fraction $ {p_\mathrm {T,g}} $ in pp collisions for jets with 140 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 160 GeV and $ < \eta _{\text {jet}} > <$ 1.3. The data are compared to a simulation using the PYTHIA event generator. Vertical lines indicate size of statistical uncertainty. The parameters used for the SD algorithm are $ {z_{\text {cut}}} = $ 0.5, $\beta = $ 1.5. The jets are selected based on the ungroomed jet transverse momentum. |
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Figure 1-b:
Groomed jet momentum fraction $ {p_\mathrm {T,g}} $ in 10% most central PbPb collisions for jets with 140 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 160 GeV and $ < \eta _{\text {jet}} > <$ 1.3. The data are compared to the same PYTHIA events embedded in PbPb events simulated with the HYDJET event generator. Vertical lines indicate size of statistical uncertainty. The parameters used for the SD algorithm are $ {z_{\text {cut}}} = $ 0.5, $\beta = $ 1.5. The jets are selected based on the ungroomed jet transverse momentum. |
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Figure 2:
The spectra of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $ for pp events with 160 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 180 GeV using (0.1,0.0) SD setting (left panels) and (0.5,1.5) SD setting (right panels). Results are compared to PYTHIA and HERWIG++ event generators. The ratio of simulation to data is also shown. The heights of the gray boxes indicate systematic uncertainties. Statistical uncertainties are less than the marker sizes. |
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Figure 3:
(left) The centrality dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events with 160 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 180 GeV for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. (right) The ratio of PbPb data over smeared pp data. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. Statistical uncertainties are less than the marker sizes in most bins. |
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Figure 3-a:
The centrality dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events with 160 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 180 GeV for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. Figure 3-b |
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Figure 3-b:
(left) The centrality dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events with 160 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 180 GeV for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. (right) The ratio of PbPb data over smeared pp data. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. Statistical uncertainties are less than the marker sizes in most bins. |
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Figure 4:
(left) The centrality dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events with 160 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 180 GeV for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. (right) The ratio of PbPb data over smeared pp data. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. Statistical uncertainties are less than the marker sizes in most bins. |
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Figure 4-a:
The centrality dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events with 160 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 180 GeV for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. |
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Figure 4-b:
The ratio of PbPb data over smeared pp data. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. Statistical uncertainties are less than the marker sizes in most bins. |
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Figure 5:
(left) The $ {{p_{\mathrm {T}}} ^\text {jet}} $ dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events in the centrality class 0-10%, for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. (right) The ratio of PbPb data over smeared pp data. The heights of the colored boxes indicate systematic uncertainties. Statistical uncertainties are less than the marker sizes. The ratios are compared to smeared JEWEL and Q-PYTHIA generators, shown in blue and green, respectively. |
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Figure 5-a:
The $ {{p_{\mathrm {T}}} ^\text {jet}} $ dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events in the centrality class 0-10%, for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. |
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Figure 5-b:
The ratio of PbPb data over smeared pp data. The heights of the colored boxes indicate systematic uncertainties. Statistical uncertainties are less than the marker sizes. The ratios are compared to smeared JEWEL and Q-PYTHIA generators, shown in blue and green, respectively. |
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Figure 6:
(left) The $ {{p_{\mathrm {T}}} ^\text {jet}} $ dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events in the centrality class 0-10%, for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. (right) The ratio of PbPb data over smeared pp data. The heights of the colored boxes statistical (systematic) uncertainties. Statistical uncertainties are less than the marker sizes. The ratios are compared to smeared JEWEL and Q-PYTHIA generators, shown in blue and green, respectively. |
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Figure 6-a:
The $ {{p_{\mathrm {T}}} ^\text {jet}} $ dependence of $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, for PbPb events in the centrality class 0-10%, for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. |
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Figure 6-b:
The ratio of PbPb data over smeared pp data. The heights of the colored boxes statistical (systematic) uncertainties. Statistical uncertainties are less than the marker sizes. The ratios are compared to smeared JEWEL and Q-PYTHIA generators, shown in blue and green, respectively. |
| Summary |
|
The first measurements of the ratio of the groomed jet mass and the transverse momentum of the jet, $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $, in pp and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. Both the PYTHIA and HERWIG++ event generators reproduce the measurement in pp collisions. The results demonstrate that different grooming settings provide sensitivity to different parts of the phase space of subjet angular separation and momentum sharing. For soft drop (SD) grooming parameters that remove more radiation at distances far away from the jet axis, ($z_{\text {cut}}= $0.5, $\beta=$ 1.5), the $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $ distribution in PbPb collisions is, within uncertainties, in agreement with that measured in pp collisions for all studied centrality (0-80%) and $ {{p_{\mathrm {T}}} ^\text {jet}} $ (140-300 GeV) regions. Using the ($z_{\text {cut}}= $ 0.1, $\beta= $ 0.0) SD setting, for which the grooming is independent of the angular separation of the subjets, no significant modification of the $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $ spectra in 10-80% peripheral collisions with respect to the measurement in pp collisions is observed. However, for the 10% most central collisions, a hint of increased probability to produce jets with large $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $ is seen when compared to pp collisions for jets with 140 $ < {{p_{\mathrm {T}}} ^\text {jet}} < $ 180 GeV. The difference between the results from the two examined grooming settings indicates that the region of phase space where modifications are most significant are splittings with large angular separation and low-to-moderate momentum sharing. The measurements are compared to the jet quenching event generators JEWEL and QPYTHIA, both of which predict a large enhancement at large $ {{M_{\mathrm {g}}} / {{p_{\mathrm {T}}} ^\text {jet}}} $ that is not observed in the data. |
| Additional Figures | |
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Additional Figure 1:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 0-10% for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown, and compared to jewel [1] and q-pythia [2] generators. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
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Additional Figure 2:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 10-30% for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
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Additional Figure 3:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 30-50% for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
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Additional Figure 4:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 50-80% for the (0.1,0.0) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
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Additional Figure 5:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 0-10% for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown, and compared to the jewel [1] and q-pythia [2] generators. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
png pdf |
Additional Figure 6:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 10-30% for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
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Additional Figure 7:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 30-50% for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
png pdf |
Additional Figure 8:
The $p_\text {T}^\text {jet}$ dependence of $M_\text {g}/p_\text {T}^\text {jet}$, for PbPb events in the centrality class 50-80% for the (0.5,1.5) SD setting. Results are compared to the smeared pp spectra. The ratio of PbPb data over smeared pp is also shown. The heights of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
png pdf |
Additional Figure 9:
The $M_\text {g}/p_\text {T}^\text {jet}$ dependence of systematic uncertainties for the (0.1,0.0) SD setting for jets with 140 $ < p_\text {T}^\text {jet} < $ 160 GeV in an event in the centrality class 0-10%, expressed as percentages relative to the size of the mass spectrum at each $M_\text {g}/p_\text {T}^\text {jet}$ value. |
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Additional Figure 10:
The $M_\text {g}/p_\text {T}^\text {jet}$ dependence of systematic uncertainties for the (0.5,1.5) SD setting for jets with 140 $ < p_\text {T}^\text {jet} < $ 160 GeV in an event in the centrality class 0-10%, expressed as percentages relative to the size of the mass spectrum at each $M_\text {g}/p_\text {T}^\text {jet}$ value. |
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Additional Figure 11:
The $M_\text {g}/p_\text {T}^\text {jet}$ dependence of systematic uncertainties for the (0.1,0.0) SD setting for jets with 200 $ < p_\text {T}^\text {jet} < $ 300 GeV in an event in the centrality class 50-80%, expressed as percentages relative to the size of the mass spectrum at each $M_\text {g}/p_\text {T}^\text {jet}$ value. |
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Additional Figure 12:
The $M_\text {g}/p_\text {T}^\text {jet}$ dependence of systematic uncertainties for the (0.5,1.5) SD setting for jets with 200 $ < p_\text {T}^\text {jet} < $ 300 GeV in an event in the centrality class 50-80%, expressed as percentages relative to the size of the mass spectrum at each $M_\text {g}/p_\text {T}^\text {jet}$ value. |
png pdf |
Additional Figure 13:
The $M_\text {g}/p_\text {T}^\text {jet}$ spectra, for events in the centrality class 0-10% for the (0.1,0.0) SD setting for jets with 140 $ < p_\text {T}^\text {jet} < 160$ GeV. Results are compared to the smeared pp spectrum. The height of the colored boxes indicate systematic uncertainties. The statistical uncertainties are smaller than the marker size. |
png pdf |
Additional Figure 14:
The ratio of $M_\text {g}/p_\text {T}^\text {jet}$ spectra of PbPb data over smeared pp, for events in the centrality class 0-10% for the (0.1,0.0) SD setting for jets with 140 $ < p_\text {T}^\text {jet} < $ 160 GeV. The data is compared to jewel [1] and q-pythia [2] generators. The height of the vertical lines (colored boxes) indicate statistical (systematic) uncertainties. |
png pdf |
Additional Figure 15:
The $M_\text {g}/p_\text {T}^\text {jet}$ spectra, for events in the centrality class 0-10% for the (0.5,1.5) SD setting for jets with 140 $ < p_\text {T}^\text {jet} < $ 160 GeV. Results are compared to the smeared pp spectrum. The height of the colored boxes indicate systematic uncertainties. The statistical uncertainties are smaller than the marker size. |
png pdf |
Additional Figure 16:
The ratio of $M_\text {g}/p_\text {T}^\text {jet}$ spectra of PbPb data over smeared pp, for events in the centrality class 0-10% for the (0.5,1.5) SD setting for jets with 140 $ < p_\text {T}^\text {jet} < $ 160 GeV. The data is compared to jewel [1] and q-pythia [2] generators. The height of the colored boxes indicate systematic uncertainties. The statistical uncertainties are smaller than the marker size. |
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