Speaker
Description
The analysis aims to obtain the results of High gain and Medium gain intercalicration by using data23 and data24 special runs, which were acquired with the threshold to switch from High gain to Medium gain LAr readout in both the first and second layers of the EM calorimeter significantly lowered.
A discrepancy between the reconstructed dielectron invariant mass $𝑚_{𝑒^{+}𝑒^{−}}$ obtained from $𝑍 → 𝑒^{+}𝑒^{−}$ events in data and MC was observed, when events were split according to the electronic High or Medium gain of the highest energy cell of the Liquid Argon electromagnetic calorimeter second longitudinal layer. So we should intercalibrate L2 High Gain and Medium Gain to make the energy obtained by HG readout and MG readout consistent.
The value of results are obviously bigger than Run2 results. From our study so far, the mainly reason is that the HG and MG threshold in L1 changes. In Run2 special run configuration, only the threshold of L2 high gain and medium gain become lower. However, in Run3 special run configuration, both of L1 and L2 threshold of HG and MG have changed. So current results are obtained considering the combined effect of L1 and L2. It's reasonable that current results are bigger than Run2 results.
