Femtoscopy with identified charged pions in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ATLAS
- Aaboud, Morad et al
- arXiv:1704.01621CERN-EP-2017-004
| The distribution of the total transverse energy in the forward calorimeter in the Pb-going direction (\sumETPb) for the events used in this analysis. Dashed lines are shown at the boundaries of the centrality intervals, and the discontinuity at $\sumETPb = 91.08~\GeV$ corresponds to the lower \sumETPb boundary of the 0--1\% centrality interval. |
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| Purity of identified pion pairs with the loose (a), tight (b), and middle (c) PID selections. The purities are estimated using fully simulated \Hijing \pPb events, as a function of the pair's average transverse momentum \kt and rapidity \kys. The rapidity is calculated using the pion mass for both reconstructed charged particles. |
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| Correlation functions in \pPb data for opposite-charge (teal circles) and same-charge (red squares) pairs. The opposite-charge correlation function, with the most prominent resonances removed, is fit to a function of the form in \Eqn{\ref{eq:bkgd_form}} (blue dashed line). The violet dotted line is the estimated jet contribution in the same-charge correlation function, also of the form of \Eqn{\ref{eq:bkgd_form}}, and the dark red line is the full fit of \Eqn{\ref{eq:correlation_function_full}} to the same-charge data. |
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| Comparison of jet fragmentation parameters between opposite- and same-charge correlation functions. The amplitude is shown in (a), and the two widths in (b,c). The lines are fits of the data to \Eqnrange{\ref{eqn:lambdaBackParOSL}}{\ref{eqn:rBackParSL}}. For each \kt interval, four multiplicity intervals are shown ($26 \leq \Nch \leq36$, $37 \leq \Nch \leq48$, $49 \leq \Nch \leq64$, and $65 \leq \Nch$). |
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| Results of the fit to the one-dimensional correlation function in very central (0--1\%) events in three \kt intervals. The dashed blue line indicates the description of the contribution from jet fragmentation and the red line shows the full correlation function fit. The dotted red line indicates the extrapolation of the fit function beyond the interval over which the fit is performed. |
| Results of the fit to the one-dimensional correlation function in semi-central (20--30\%) events in three \kt intervals. The dashed blue line indicates the description of the contribution from jet fragmentation and the red line shows the full correlation function fit. The dotted red line indicates the extrapolation of the fit function beyond the interval over which the fit is performed. |
| Results of the fit to the one-dimensional correlation function in relatively peripheral (60--70\%) events in three \kt intervals. The dashed blue line indicates the description of the contribution from jet fragmentation and the red line shows the full correlation function fit. The dotted red line indicates the extrapolation of the fit function beyond the interval over which the fit is performed. |
| Results of the 3D fit to the correlation function in the $0.4 < \kt < 0.5$~\GeV, $-1 < \kys < 0$ kinematic intervals and for the 10--20\% centrality interval. The left, middle, and right panels show the distributions versus \qout, \qside, and \qlong, respectively, with limits on the other two components of $\mathbf{q}$ such that $|q_i| < 40~\MeV$. The dashed blue line indicates the description of the contribution from hard processes and the red line shows the full correlation function fit. The dotted red line indicates the extrapolation of the fit function beyond the interval over which the fit is performed. |
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