Abstract
The presence of colored particles can affect both the single and the pair Higgs productions substantially. For scalar particles, this happens if their portal couplings to the Standard Model Higgs are large and their masses are not too high. In the present work these processes are studied in the case of several leptoquarks which may appear in many beyond Standard Model theories. It is found that the constraints on the portal couplings from the single Higgs production and the decays to various channels measured by the LHC experiments still allow increased Higgs pair production rate. For the masses in the range from 180 GeV to 300 GeV, depending on the strength of such portal couplings, the Higgs pair production may reach an order to several hundred in magnitude larger rate than the Standard Model case for the 8 TeV run. Therefore, combined with the on going searches for leptoquarks by both the CMS and ATLAS, this is one of the possible scenarios to be probed directly by the current data. The current study demonstrates that if colored scalars modify scalar potentials through portal couplings, which has been studied for variety of motivations such as playing a potentially important role in electroweak phase transition, composite models or radiative neutrino masses, this fact may appear as the modified Higgs pair production.
Highlights
JHEP01(2014)158 as 830 GeV, 525 GeV with 5 fb−1 7 TeV data for first and third generation LQs, 1070 GeV with 20 fb−1 8 TeV data for second generation LQ respectively assuming they decay 100% to the considered decay channels
It is found that the constraints on the portal couplings from the single Higgs production and the decays to various channels measured by the LHC experiments still allow increased Higgs pair production rate
The current study demonstrates that if colored scalars modify scalar potentials through portal couplings, which has been studied for variety of motivations such as playing a potentially important role in electroweak phase transition, composite models or radiative neutrino masses, this fact may appear as the modified Higgs pair production
Summary
ATLAS and CMS both have released their results on the Higgs searches from 7 and 8 TeV runs. Any new resonance should not affect the single Higgs production and the diphoton channel too much This requirement alone makes a single colored scalar object harder to exist at lower mass range if its portal coupling of |H|2|X|2 type is large. The searches for LQs at LHC have given lower bounds on their masses for several different LQ decay channels for the data collected at 7 TeV by both CMS and ATLAS collaborations. This is because the electroweak precision test requires the mass splitting within the SU(2)L doublet components be less than ∼ 52 GeV [77] Both the ATLAS and CMS have put the constraint on the mass by varying the branching fractions of the searched channels. From the above discussion we see that the signals for the ω pair production are χiχjW +∗W −∗ with the off shell W ’s subsequently decaying either hadronically or leptonically when F23 or F33 is the largest coupling
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