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| CMS-PAS-HIN-26-007 | ||
| Searching for jet quenching effects and medium response with correlations of Z bosons and hadrons in proton-lead collisions at $ \sqrt{s_\text{NN}} = $ 8.16 TeV | ||
| CMS Collaboration | ||
| 2026-08-06 | ||
| Abstract: A measurement of the pseudorapidity and azimuthal angle distributions of charged hadrons relative to a Z boson in both proton-lead (pPb) collisions at $ \sqrt{s_\text{NN}} = $ 8.16 TeV and in proton-proton (pp) collisions at $ \sqrt{s_\text{NN}} = $ 5.02 TeV, corresponding to integrated luminosities of 174 $ \mathrm{nb}^{-1} $ and 301 $ \mathrm{pb}^{-1} $, respectively, is reported. Collision events with at least one Z boson are correlated with charged hadrons in the transverse momentum range 0.5 $ < p_\mathrm{T}^\text{ch} < $ 15 GeV. Modification of the distributions measured in heavy ions with respect to vacuum is sensitive to energy depletion and subsequent medium response caused by the passage of a hard probe through the quark-gluon plasma. These results provide the first search of similar effects in the smaller pPb collision system. No clear modification of the pseudorapidity and azimuthal angle distributions is observed, providing constraints on potential jet quenching and medium response effects in small collision systems. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The $ \Delta\phi_{\mathrm{ch,Z}} $ spectrum (left) and $ \Delta y_{\mathrm{ch,Z}} $ spectrum (right) for fully corrected pPb and pp data at 8.16 TeV in 0 $ < p_{\mathrm{T}}^{\mathrm{Z}} < $ 500 GeV and 0.5 $ < p_{\mathrm{T}}^\text{ch} < $ 15 GeV. The $ \Delta y_{\mathrm{ch,Z}} $ result is calculated in the Z boson-going direction ($ |\Delta\phi_{\mathrm{ch,Z}}| < \pi/ $ 2). Vertical solid bars represent statistical uncertainty and shaded bars represent systematic uncertainty. Filled markers show data and open markers are reflected data. |
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Figure 1-a:
The $ \Delta\phi_{\mathrm{ch,Z}} $ spectrum (left) and $ \Delta y_{\mathrm{ch,Z}} $ spectrum (right) for fully corrected pPb and pp data at 8.16 TeV in 0 $ < p_{\mathrm{T}}^{\mathrm{Z}} < $ 500 GeV and 0.5 $ < p_{\mathrm{T}}^\text{ch} < $ 15 GeV. The $ \Delta y_{\mathrm{ch,Z}} $ result is calculated in the Z boson-going direction ($ |\Delta\phi_{\mathrm{ch,Z}}| < \pi/ $ 2). Vertical solid bars represent statistical uncertainty and shaded bars represent systematic uncertainty. Filled markers show data and open markers are reflected data. |
png pdf |
Figure 1-b:
The $ \Delta\phi_{\mathrm{ch,Z}} $ spectrum (left) and $ \Delta y_{\mathrm{ch,Z}} $ spectrum (right) for fully corrected pPb and pp data at 8.16 TeV in 0 $ < p_{\mathrm{T}}^{\mathrm{Z}} < $ 500 GeV and 0.5 $ < p_{\mathrm{T}}^\text{ch} < $ 15 GeV. The $ \Delta y_{\mathrm{ch,Z}} $ result is calculated in the Z boson-going direction ($ |\Delta\phi_{\mathrm{ch,Z}}| < \pi/ $ 2). Vertical solid bars represent statistical uncertainty and shaded bars represent systematic uncertainty. Filled markers show data and open markers are reflected data. |
png pdf |
Figure 2:
The $ \Delta\phi_{\mathrm{ch,Z}} $ (top) and $ \Delta y_{\mathrm{ch,Z}} $ (bottom) spectra for fully corrected pPb and pp data at 8.16 TeV in 0 $ < p_{\mathrm{T}}^{\mathrm{Z}} < $ 500 GeV. The results are presented as a scan over $ p_{\mathrm{T}}^\text{ch} $ selections of 0.5--2 (left), 2--4 (middle), and 4--15 GeV (right). The $ \Delta y_{\mathrm{ch,Z}} $ result is calculated in the Z boson--going direction ($ |\Delta\phi_{\mathrm{ch,Z}}| < \pi/ $ 2). Vertical solid bars represent statistical uncertainty and shaded bars represent systematic uncertainty. Filled markers show data and open markers are reflected data. |
png pdf |
Figure 3:
The $ \Delta\phi_{\mathrm{ch,Z}} $ (top) and $ \Delta y_{\mathrm{ch,Z}} $ (bottom) spectra for fully corrected pPb and pp data at 8.16 TeV in 0 $ < p_{\mathrm{T}}^{\mathrm{Z}} < $ 30 GeV. The results are presented as a scan over $ p_{\mathrm{T}}^\text{ch} $ selections of 0.5--2 (left), 2--4 (middle), and 4--15 GeV (right). The $ \Delta y_{\mathrm{ch,Z}} $ result is calculated in the Z boson--going direction ($ |\Delta\phi_{\mathrm{ch,Z}}| < \pi/ $ 2). Vertical solid bars represent statistical uncertainty and shaded bars represent systematic uncertainty. Filled markers show data and open markers are reflected data. |
png pdf |
Figure 4:
The $ \Delta\phi_{\mathrm{ch,Z}} $ (top) and $ \Delta y_{\mathrm{ch,Z}} $ (bottom) spectra for fully corrected pPb and pp data at 8.16 TeV in 30 $ < p_{\mathrm{T}}^{\mathrm{Z}} < $ 500 GeV. The results are presented as a scan over $ p_{\mathrm{T}}^\text{ch} $ selections of 0.5--2 (left), 2--4 (middle), and 4--15 GeV (right). The $ \Delta y_{\mathrm{ch,Z}} $ result is calculated in the Z boson-going direction ($ |\Delta\phi_{\mathrm{ch,Z}}| < \pi/ $ 2). Vertical solid bars represent statistical uncertainty and shaded bars represent systematic uncertainty. Filled markers show data and open markers are reflected data. |
| Tables | |
png pdf |
Table 1:
RMS of absolute systematic uncertainties in the normalized associated yield across all bins of the inclusive $ \Delta\phi_{\mathrm{ch,Z}} $ and $ \Delta y_{\mathrm{ch,Z}} $ distributions for pPb and pp. |
| Summary |
| This note presents the first measurement of correlations between Z bosons and charged hadrons in bins of rapidity ($ \Delta y_{\mathrm{ch,Z}} $) and azimuthal angle ($ \Delta\phi_{\mathrm{ch,Z}} $) difference in pPb collisions at \mbox $ \sqrt{s_{\mathrm{NN}}} = $ 8.16 TeV}. This analysis was enabled by the integrated luminosity of 174 $ \text{nb}^{-1}$\ collected during the 2016 pPb data-taking period and 301 pb$ ^{-1} $ collected during the 2017 pp data-taking period. Collision data with at least one Z boson were analyzed to study medium-induced modifications differentially in Z boson transverse momenta $ p_{\mathrm{T}}^{\mathrm{Z}} $ and charged particle transverse momenta $ p_{\mathrm{T}}^\text{ch} $. The azimuthal angle distribution ($ \Delta\phi_{\mathrm{ch,Z}} $) and rapidity distribution ($ \Delta y_{\mathrm{ch,Z}} $) of Z-tagged hadrons were fully corrected and compared between pPb and reference pp data. The results are presented for Z bosons in the wide $ p_{\mathrm{T}}^{\mathrm{Z}} $ interval 0--500 GeV and charged hadrons in the $ p_{\mathrm{T}}^\text{ch} $ interval 0.5--15 GeV as well as a scan over finer $ p_{\mathrm{T}}^\text{ch} $ intervals (0.5--2, 2--4, and 4--15) GeV. In all cases, no significant modification of the azimuthal angle or rapidity distributions is observed in pPb collisions relative to a vacuum reference, disfavoring the presence of jet quenching effects in the pPb system. Due to the precision of the electroweak boson channel, the analysis places constraints on the potential magnitude of jet energy loss and medium response signals, if present. Additional work will be needed in order to reconcile this idea with the signatures of collectivity observed in the same collision system. |
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