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Higgs data does not rule out a sequential fourth generation with an extended scalar sector

Das, Dipankar LU ; Kundu, Anirban and Saha, Ipsita (2018) In Physical Review D 97(1).
Abstract

Contrary to 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. This, however, is feasible only if the scalar sector of the standard model is extended. We also provide a... (More)

Contrary to 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. 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.

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Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D
volume
97
issue
1
article number
011701
publisher
American Physical Society
external identifiers
  • scopus:85041708673
ISSN
2470-0010
DOI
10.1103/PhysRevD.97.011701
language
English
LU publication?
no
id
98b2c33d-47e5-42a5-b212-9838425a6486
date added to LUP
2019-05-22 15:24:08
date last changed
2019-11-20 05:45:02
@article{98b2c33d-47e5-42a5-b212-9838425a6486,
  abstract     = {<p>Contrary to 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. 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.</p>},
  author       = {Das, Dipankar and Kundu, Anirban and Saha, Ipsita},
  issn         = {2470-0010},
  language     = {eng},
  month        = {01},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review D},
  title        = {Higgs data does not rule out a sequential fourth generation with an extended scalar sector},
  url          = {http://dx.doi.org/10.1103/PhysRevD.97.011701},
  doi          = {10.1103/PhysRevD.97.011701},
  volume       = {97},
  year         = {2018},
}