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Mass of Top quark and Higgs boson
Hidenori S. Fukano@ KMI-Topics 07/08/2013
H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

2 / 25

Participants in the Standard Model
05.07.012
The Asahi Shinbun

long awaited(from 1960ʼs)
participantfrom Felimlab

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

3 / 25My question

Why is the top quark heavy ?

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

4 / 25Mass : all SM participants

Gordon Kane,Scientific American 2003.

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

5 / 25Mass : all SM participantsO(100GeV)tH ZW

Gordon Kane,Scientific American 2003.

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

6 / 25Mass (t,Z,W,h)

mt = 173.07 GeV

PDG,central value(Direct mesurements)t

O(100GeV)

H ZW
mh = 125.5 GeV
H.S.Fukano(KMI)mZ = 91.1876 GeV
PDG,central value

mW = 80.385 GeV
PDG,central value

ATLAS-CONF-2013-014,central value

Mass: Top and Higgs

07.08.2013

@ KMI topics

7 / 25My Questiont

H ZW

O(100GeV)Why do they havethe almost same order masses ?
Gordon Kane,Scientific American 2003.

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

8 / 25The Standard Model (Lagrangian)©2011-2013 PhysicsAndMore
from Felimlab

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

9 / 25

Origin of mass in the SM

In the SM,
Origin of mass is the Higgs mechanism

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

10/ 25t,W,Z,H masses in the SM

Top quark mass
Higgs boson mass
W,Z boson mass

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

11/ 25My Question

New physics is hidden
behind the Higgs mechanism ?

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

12/ 25

New physics in the market
Representative scenarios in New physics market

Supersymmetry
Extra dimension

Dynamical electroweak symmetry breaking

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

13/ 25

Technicolor (for W,Z boson)

Weinberg(1976); Susskind (1979)

1µµGµ G + iQ̄ Dµ Q
4New interaction : G, New fermion : Q
H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

14/ 25

Technicolor (for top quark mass)+g22ETC

Q̄Q¯

Dimopoulos et.al. (1979)
Eichten et.al. (1980)

Extended

H.S.Fukano(KMI)

1µµGµ G + iQ̄ Dµ Q
4
Mass: Top and Higgs

07.08.2013

@ KMI topics

15/ 25

Technicolor (for Higgs boson)+Walking

g22ETCQ̄Q¯

1µµGµ G + iQ̄ Dµ Q
4technicolor w/would-be light
Higgs boson

Yamawaki et.al. (1986)

H.S.Fukano(KMI)Mass: Top and Higgs

07.08.2013

@ KMI topics

16/ 25

Technicolor (large top quark mass ?)Top quark mass V.S. EW precision tests
SM result @ tree satisﬁes

Experimental results

Experiments show
0 (T2MW=122
MZ cos W

0.50T)-0.5-0.5

Extended technicolor implies
Tm2QU m2QD
m2QU + m2QD

00.5

S

Not realistic !!

1m2t
H.S.Fukano(KMI)

Ciuchini et.al.
arXiv:1306.4644

Mass: Top and Higgs

m3QU
2ETC

m2bm3QD
2ETC

07.08.2013

@ KMI topics

17/ 25Top quark mass in technicolor

From viewpoint of my question ....

Large top quark mass
CAN NOT be realized
in standard technicolor scenario=even if Walking technicolor
technicolor w/light Higgs boson (dilaton)
H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

18/ 25Top quark condensation+Miransky et.al. (1989)
Nambu (1989)
Bardeen et.al. (1989)

H.S.Fukano(KMI)

g22
topC

(t̄L tR ) (t̄R tL )Mass: Top and Higgs

07.08.2013

@ KMI topics

19/ 25Top quark condensation

The top quark mass can be heavy
in a manner consistent withthe EW precision tests.
However

The top quark mass is too large...

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

20/ 25Top quark seesaw model+g2

2
topC

χ=
new top-like quark
H.S.Fukano(KMI)(t̄L R ) ( ¯R tL )Mass: Top and Higgs

Dobrescu et.al.; Chivukula et.al. 1998

07.08.2013

@ KMI topics

21/ 25Top quark seesaw

g2(t̄L R ) ( ¯R tL )2topC

Higgs boson is generated asa top quark-top partner pair composite
H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

22/ 25Top quark seesaw V.S. EWPT and LHC

Higgs boson can be parametrically lightin the top quark seesaw model
174GeV

w/ keeping mt

0.30 ⇤/µ = 100.25 ⇤/µ = 26

68%

ch0 bb = ch0 ⌧ ⌧(b, ✏max ) = (0.15, 0.097)⇤/µ= 100(b, ✏max ) = (0.22, 0.18)

⇥

⇥
0.8
best fit point for case.1,2C.L

0.05

0.6

0.00
0.10 0.05 0.00 0.05 0.10 0.15 0.20

SH.S.Fukano(KMI)⇥1.0.allowed0.10

95%

1.2

regi
on0.15(b, ✏max ) = (0.18, 0.13)

95%

T

0.20

best fit point for case.3

Excluded region
by gLb (95%C.L.)

0.6

H.S.F and Tuominen
arXiv:1306.0205

Mass: Top and Higgs

0.8

1.0c h0 V V

07.08.2013

1.2

@ KMI topics

23/ 25Top quark mass in top quark seesaw

From viewpoint of my question ....

Large top quark mass CAN be realizedAND
Light Higgs boson CAN be realized
w/o conflicting with the EWPT & LHC

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

24/ 25

Question about Higgs in the TSS
In general, TSS Higgs boson satisfies mh2mt

Why TSS Higgs boson can be lighter
than the top quark mass ?
Ongoing ...
TSS Higgs boson might be PNGB...

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013

@ KMI topics

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Summary
Q : Why is the top quark heavy ?
A1: Technicolor can not explain it
A2 : Top seesaw model is good (at least for me)
Higgs boson = composite stateH¯ R tL

Lightness = PNGB ?

!ank y" very much

H.S.Fukano(KMI)

Mass: Top and Higgs

07.08.2013