Abstract
The $t\bar t$ plus missing energy channel is one of the most efficient to detect third-generation leptoquarks (LQs). It offers an important test to models which explain flavor anomalies in $B$ meson decays. We outline a search strategy in the channel, relying on tagging the tops and on observables constructed out of the tops, and we assess the reach on LQs of the future high-luminosity LHC program. We find that with 3 ab$^{-1}$ a vector (scalar) LQ decaying 50% (100%) to top and neutrino can be excluded up to masses of 1.96 TeV (1.54 TeV). We also indicate several observables that, in case of a future discovery in the channel, can be used to distinguish a scalar LQ from a vector LQ. The implications of our findings to models addressing the recent flavor anomalies are finally discussed.
Highlights
Leptoquarks (LQs), which are hypothetical particles carrying both lepton and baryon number, appear in a variety of theories beyond the Standard Model (BSM), as Pati-Salam model [1], grand unification theories [2], and BSM composite dynamics [3]
We have studied the pair production of LQs in the tt plus missing energy channel, which is one of the most powerful to detect third-generation LQs
We have indicated a search strategy in the channel, which shows the advantages of tagging the tops in the final state and which uses observables constructed out of the tops to discriminate the signal from the background and to characterize the signal
Summary
Leptoquarks (LQs), which are hypothetical particles carrying both lepton and baryon number, appear in a variety of theories beyond the Standard Model (BSM), as Pati-Salam model [1], grand unification theories [2], and BSM composite dynamics [3]. In our study we consider pair-produced vector and scalar LQs each decaying into a top and a neutrino, leading to a final state of two tops plus missing energy. This channel, due to a peculiar topology and to the possibility of exploiting the top tagging to disentangle the signal from the background, proves to be very powerful and, as we will show, it represents one of the best channels to probe LQs involved in the explanation of the flavor anomalies.
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