Composite Higgs
models can trivially satisfy precision-electroweak and flavour
constraints by simply having a large spontaneous symmetry breaking
scale, f > 10 TeV. This produces a 'split' spectrum, where the strong
sector resonances have masses greater than 10 TeV and are separated
from the pseudo Nambu-Goldstone bosons, which remain near the
electroweak scale. Even though a tuning of order 10^{-4} is required to
obtain the observed Higgs boson mass, the big hierarchy problem remains
mostly solved. Intriguingly, models with a fully-composite right-handed
top quark also exhibit improved gauge coupling unification. By
restricting ourselves to models which preserve these features we find
that the symmetry breaking scale cannot be arbitrarily raised, leading
to an upper bound f < 100-1000 TeV. Dark matter is identified with a
pseudo Nambu-Goldstone boson, and we show that the smallest coset space
containing a stable, scalar singlet and an unbroken SU(5) symmetry is
SU(7) / SU(6) x U(1). The colour-triplet pseudo Nambu-Goldstone boson
also contained in this coset space is metastable due to a residual
symmetry. We show that existing searches for collider-stable R-hadrons
from Run-I at the LHC forbid a triplet scalar mass below 845 GeV,
whereas with 300fb−1 at 13 TeV triplet scalar masses up to 1.4 TeV can be discovered. For shorter lifetimes displaced-vertex searches provide a discovery reach of up to 1.8
TeV. In addition we present exclusion and discovery reaches of future
hadron colliders as well as indirect limits that arise from
modifications of the Higgs couplings.
Journal Club
2015.10.29 16:32
[Journal Club] The Unnaturally Split Composite Higgs
Attachment '2' |
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PTC Seminar / Journal Club / Workshop
PTC Seminar Organizers (click to contact) :
Chang Sub Shin Jeff Kost Dongjin Chway
PTC Seminar Schedule (click)
PTC Journal Club Organizer (click to contact) :
- Di Xu
PTC Journal Club Schedule (click)
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Journal Club Schedule
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Link to the publications
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Use the indico link for the seminar announcements.
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[Seminar] (Apr 01 2015) by Hye-Sung Lee on <Quest for a New Fundamental Force>
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[School]2016 Winter School on Cosmology and Particle Physics(Dec 12-23, 2016)
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[School] Wonju Spring School (Apr 13-18 2015)
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[School] 2018 Summer School on Cosmology and Particle Physics (Jul 23-27, 2018)
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[School] 2017 Summer School on Cosmology and Particle Physics (Aug 7-11, 2017)
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[School] 2016 Winter School on Collider Physics
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[Lecture] (Mar 09 - 13 2015) by Kiwoon Choi on <Axions>
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[Lecture] (Feb 02-06 2015) by Jai-chan Hwang
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[Journal Club] The Unnaturally Split Composite Higgs
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[Journal Club] (Oct 01 2015) by Kunio Kaneta on `Spontaneous leptogenesis via Majoron oscillation'
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[Journal Club] (Nov 27 2014) by Hyungjin Kim
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[Journal Club] (Nov 26 2015) by Toyokazu Sekiguchi
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[Journal Club] (Nov 20 2014) by Sang Hui Im
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[Journal Club] (Nov 13 2014) by Stephen Angus
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[Journal Club] (May 29 2015) by Sung Hak Lim
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[Journal Club] (May 22 2015) by Hyungjin Kim
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[Journal Club] (Mar 31 2015) by Ryotaro Watanabe
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[Journal Club] (Mar 12 2015) by Sanghui Im & Beranger Dumont
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[Journal Club] (Mar 10 2016) by Doh Young Mo on 'Introduction of Jet-Image: New Method for Jet Tagging'
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[Journal Club] (Mar 05 2015) by Hyungjin Kim