Jan 14 – 17, 2019
IST, Lisboa, Portugal
Europe/Lisbon timezone

Evasive maneuvers for a sequential fourth generation to circumvent the Higgs data

Jan 14, 2019, 5:10 PM
Anfiteatro Abreu Faro (IST, Lisboa, Portugal)

Anfiteatro Abreu Faro

IST, Lisboa, Portugal

Av Rovisco Pais 1049-001 Lisboa Portugal


Dipankar Das


Contrary to common perception, we show that the current Higgs data does not eliminate the possibility of a sequential fourth generation that gets its mass through the same Higgs mechanism as the first three generations. The inability to fix the sign of the bottom-quark Yukawa coupling from the available data plays a crucial role in accommodating a chiral fourth generation which is consistent with the bounds on the Higgs signal strengths. We show that the effects of such a fourth generation can remain completely hidden not only in the production of the Higgs boson through gluon fusion but also to its subsequent decay to two photons and Z-photon. This, however, is feasible only if the scalar sector of the standard model is extended. We also provide a practical example illustrating how our general prescription can be embedded in a realistic model.

Presentation materials