A low-pT collimated hadronic di-tau tagger is built from a large-radius jet with two subjets and a BDT, with data-to-simulation scale factors of 1.00 and 1.01 measured in Z-gamma events.
Signal for a light singlet scalar at the LHC
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abstract
In the general Higgs portal like models, the extra neutral scalar, $S$, can mix with the Standard Model (SM) Higgs boson, $H$. We perform an exploratory study focusing on the direct search for such a light singlet $S$ at the Large Hadron Collider (LHC). After careful study of the SM background, we find the process $pp\rightarrow t\bar{t}S$ followed by $S\rightarrow b\bar{b}$ can be used to investigate $S$ with mass in the $20<M_S<100$ GeV range, which has not been well explored at the LHC. The signal significance becomes meaningful with a luminosity around a few $\mbox{ab}^{-1}$. Also, we study the prospects of finding the light scalar at the future 100 TeV $pp$ collider, the $Z$ and Higgs factories. With similar luminosity, the current LEP limits on the mixing between $S$ and $H$ can be improved by at least one or two orders of magnitude.
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Reconstruction and identification of pairs of collimated $\tau$-leptons decaying hadronically using $\sqrt{s}=13$ TeV $pp$ collision data with the ATLAS detector
A low-pT collimated hadronic di-tau tagger is built from a large-radius jet with two subjets and a BDT, with data-to-simulation scale factors of 1.00 and 1.01 measured in Z-gamma events.