“School of Particles”
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| Paper IPM / Particles / 15750 |
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| Abstract: | |||||
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In this paper, we explore the constraints that the LHC can place on a massive gauge boson X that predominantly couples to the third generation of fermions. Such a gauge boson arises in scenarios where the B−L of the third generation is gauged. We focus on the mass range 10 ≤ \mx <~2 mW, where current constraints are lacking, and develop a dedicated search strategy. For this mass range, we show that b ―b τ+ τ−, where at least one of the τs decay leptonically is the optimal channel to look for the X at the LHC. The QCD production of b quarks, combined with the cleanliness of the leptons coming from the decay of the τ allow us to detect X gauge boson with couplings of \gx ∼ (0.005−0.01), for \mx < 50 \gev, and a coupling of O(0.1) for heavier X gauge boson with 100 \fb−1 of integrated luminosity. This is about a factor of 2-10 improvement over previous constraints coming from the decay of Υ→ τ+ τ−. Extrapolating to the full HL-LHC luminosity of 3000 \fb−1, the bounds on \gx can be enhanced by another factor of √2 for \mx < 50 \gev.
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