Higgs data does not rule out a sequential fourth generation.
by
Saha Ipsita(INFN Sezione di Roma)
→
Europe/Rome
Aula Conversi (Dipartimento di Fisica - Ed. G.Marconi)
Aula Conversi
Dipartimento di Fisica - Ed. G.Marconi
Description
Contrary to the common perception, we show that the current Higgs data does
not eliminate the possibility of a sequential fourth generation that get
their masses 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 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 γγ and Zγ. We also provide a practical
example illustrating how our general prescription can be embedded in a
realistic model.