CMSa-3 - Indico · 2020-03-02 · WSH, Kohda, Modak, 1906.PLB’19 Dedicated Search: Tri-Top!...
Transcript of CMSa-3 - Indico · 2020-03-02 · WSH, Kohda, Modak, 1906.PLB’19 Dedicated Search: Tri-Top!...
CMSa‒ExtraH/Yuk George W.S. Hou (NTU) NTUHEP 25+, 2/28 1
CMSa-3
Pre-prelim.
CMSa‒ExtraH/Yuk George W.S. Hou (NTU) NTUHEP 25+, 2/28 2
t
c
h
h
μ
τ
h(125) discovered 2012
Could have even be 1% ...KF Chen et al., PLB’13
2015 CMS hint at % level ...
CMSa‒ExtraH/Yuk George W.S. Hou (NTU) NTUHEP 25+, 2/28 3
PLB’92
Cheng-Sher ’87
Model III (vs I&II)
t
c
h
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2012+: One Higgs 2nd Higgs
Highly Plausible !PLB’13
Gestalt Switch
move away from Cheng-Sher “Ansatz”
ρcc ρct
ρtc ρtt
only scaffold
Extra Yukawas![Howie Haber notation]
FCNh modulated by h‒H mixing
“Alignment” could overtake Glashow-Weinberg NFC[hindsight]
CMSa‒ExtraH/Yuk George W.S. Hou (NTU) NTUHEP 25+, 2/28 5
Extra Yukawas is an Experimental Question
• With h(125) found lighter than top, no way to stop the experimentalists, young or not
(e.g. Daniel Fournier of ATLAS) from t → ch search, because they can.
• If told that Glashow&Weinberg somehow forbade it since 1977, the response would
be ... What !? ... ... (pause) ... ‒ Splendid, so much the better, Can Not Lose!
• The bottom line: It is a PDG Entry. [my bottom line for 4G search at LHC]
By generalization, should be extended to all Extra Yukawa Couplings
for i, j = 1‒3, and for F = u, d, e.
e.g. ρee for eEDM (against ρtt)
Fuyuto, WSH, Senaha, PRD’20-RC
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Alignment seems tuned in 2HDM-II: cos(β‒α) ≈ 0
But shouldn’t sub-TeV be more interesting,
and be explored by experiment?
υ
TeV
pushed t
o U
V
Gordy@SUSY2019, Corpus Christi: Decouple 2nd Doublet
h-H don’t seem to mix
Emergent “Alignment”: h so SM-Higgs-like e.g.
ATLAS 80 fb‒1
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A Good Year: 2017
• BaryoGenesis : λtImρtt can Drive ElectroWeak BaryoGenesis
• “Alignment” : sub-TeV mH can still give small h-H mixing
Fuyuto, WSH, & Senaha, PLB’18 [1705.05034]
WSH & M. Kikuchi, EPL’18 [1706.07694]
O(1)
- sabbatical -
An Epiphany: There’s Something to 2HDM w/ Extra Yukawas
g2HDM
Z2
Dyssym - Yuks George W.S. Hou (NTU) LNS/MIT, 1/13/2020 8
Collider Pheno
cg → tH/A → ttc(bar), ttt(bar)
Barger, Keung, Yencho, PLB’2010
tri-top
measured
ATLAS/CMS zooming in on 4t.
We urge the Search for 3t !
Kohda, Modak, WSH, 1710.PLB’18
for H/A above tt(bar) threshold
depending on mH, mA
ρtc, ρtt
target it!WSH, Kohda, Modak, 1906.PLB’19
ρtc
4t Search
ATLAS 36 fb-1, PRD’19
CMS 36 fb-1, EPJC’18
CMS 137 fb-1, 1908.EPJC’20
SS-top
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Dyssym - Yuks George W.S. Hou (NTU) LNS/MIT, 1/13/2020 9
In checking other constraints...
interfereSee e.g. Carena & Liu, JHEP’16
“a signal-like excess for the pseudoscalar hypotheses(largest) at 400 GeV, Γtot = 4%, 3.5σ local (1.9σ LEE)”
CMS PAS HIG-17-027
ρcc ρct
ρtc ρtt
ATLAS PRL’17 pioneered the expt’l study (with Run 1 data)
Would be interesting to see ATLAS Run 2 (and CMS/ATLAS Full Run 2)
WSH, Kohda, Modak, 1906.PLB’19
DedicatedSearch: Tri-Top !
1908.01115
Collider Pheno
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• Consistent with ρtt = 1.1, ρtc = 0.9!
• Could be due to H0 if ρtt imaginary.
4t-3t: Constrain 3t from 4t
Dyssym - Yuks George W.S. Hou (NTU) LNS/MIT, 1/13/2020 10
Collider Pheno
cg → bH+ → btb(bar)1912.10613
“forward” bnon-forward b
Why didn’t we think of this in 2017 ... ?(conceptually same as cg → tH/A)
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Proposed Program
N.B. An ATLAS group contacted last Nov. for UFO files, to pursue search.
In context of filing new 3-year Proposal last December,
► Attract&hired Efe Yazgan (started 2/2020), to build search program
► May hire new PD for purpose; Ludivine Ceard (on tchγγ now) may
join
► Initial targets:
- Same-Sign top
- bH+ (btb(bar) i.e. ℓν + 3b)
- tt(bar) Res.
► Continued Pheno effort (including Flavor & CPV)
Set up Right Team for a Whole New Mission, in Brand New Decade.
Run 2 Run 3
[2020 ‒ 2024+]
Preparations before Summer.
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Searc
h Z
one
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I could have told you up front:
H0, A0, H± ~ 500 GeV
can generate B.A.U.
CAN
Verify at LHC. Fantastic !!
Hope you took it in: Extra Yukawa Couplings ...
Summary
— Quite Likely the Next New Physics
and FPCP Probes! (skipped)
A Brand New Golden Decade Ahead