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.


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 ...


PLB’92

Cheng-Sher ’87

Model III (vs I&II)

t

c

h


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]


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


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


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

27

http://www.ntu.edu.tw/chinese/PageN.php


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

28

• Consistent with ρtt = 1.1, ρtc = 0.9!

• Could be due to H0 if ρtt imaginary.

4t-3t: Constrain 3t from 4t



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)

29



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.


Searc

h Z

one


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

CMSa-3 - Indico · 2020-03-02 · WSH, Kohda, Modak, 1906.PLB’19 Dedicated Search: Tri-Top!...

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