Experimental Proton-Deuteron and Antiproton-Antideuteron correlation function measured in high-multiplicity pp collisions at √s = 13 TeV as a function of the reduced relative pair momentum (k*). The data points are not plotted in the center of the bins, but at the center of gravity according to the underlying same-event distribution. The error bars represent the statistical uncertainties. The orange boxes show the systematic uncertainties due to cut variations, whereas the blue box at 1 indicates the relative systematic uncertainty due to the variation of the normalization range.
The following AOD data samples were analysed (all available pp datasets with √s = 13 TeV):
META_LHC16_AOD234
META_LHC17_pass1_AOD234
META_LHC18_pass1_AOD234
The standard Run2 event selection criteria were applied including |Vertex_z| < 10 cm and pileup rejection cuts. Only high-multiplicity events triggered with the kHighMultV0 trigger were used.
The most important single particle cuts used for the deuteron and anti-deuteron selection are listed below:
FilterBit 256
0.5 GeV/c < pT < 1.4 GeV/c
-0.8 < η < +0.8
-3.0 < nσTPC < +3.0
-2.0 < nσITS < +∞
The most important single particle cuts used for the proton and anti-proton selection are listed below:
FilterBit 128
0.5 GeV/c < pT < 4.0 GeV/c
-0.8 < η < +0.8
-3.0 < nσTPC < +3.0 (for p < 0.75 GeV/c)
-3.0 < nσCom < +3.0 (for p > 0.75 GeV/c) → nσCom = √ (nσTPC)2 + (nσTOF)2