X. Higgs Bosonen in Supersymmetrie. Standard Modell: 1 komplexes Higgs Duplett (4 Komponenten) 1 Vakuumerwartungswert u/Ö2 = 174 GeV 3 massive Eichbosonen (W + , W - , Z 0 ) Eine mögliche Anregung übrig: 1 neutrales Higgs Boson h Supersymmetrie - PowerPoint PPT Presentation
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X. Higgs Bosonen in Supersymmetrie
Standard Modell: 1 komplexes Higgs Duplett (4 Komponenten)
Basic 2 2 diagram Corresponding to b-pdf in ProtonDetails much more complex
Add 23, 22, and 21 w/o double counting
Solution: SHERPA MC generator w/ CKKW matchingbetween Matrix Element and Parton Shower contributionsJet fractions agree with analytic calculation (Harlander+Kilgore)
Example: full (down-type) leptonic modesb h/H/A b µ+µ-
LEP direct H± limits:Relevant in non-SUSY 2-Higgs Doublet Models (2HDM)Marginal in MSSM, since mH±
2 = mA2 + mW
2 anyway
Search for Charged Higgs Bosons
New input from b-physics!
Newly developping constraints from b-decays
Gino Isidori, 3rd Workshop: Flavour in the Era of the LHC, 2006
Well defined pattern for exp. observables Starting to give useful constraintsMost limits in literature for 2HDM !No systematic studies for MSSM yet (too many param.!)
Leading-order H± contribution!
2HDM (W.S.Hou, PRD 48 (1993) 2342)
rBBR(2HDM)/BR(SM) =
MSSM (G.Isidori, P.Paradisi, hep-ph/0605012)
Gluino-induced corrections ((mg,mq)to down-type Yukawa couplings considerable for large tan
rBBR(MSSM)/BR(SM) =
B New Physics
222
2
)tan1(
H
B
m
m
2
0
2
2
2
)tan1
tan1(
H
B
m
m
Amplitude M(H±) has opposite sign!suppression
|M (H±)| < |M (W±)|
(near-)cancellation
|M (H±)| ~ |M (W±)|
(near-)compensation
|M (H±)| ~ 2|M (W±)|
enhancement
|M (H±)| > 2|M (W±)|
rB
tan
± ±
~ ~
B Experimental Signature
B First Observations
2.6
C.Bozzi, HCP2007
MSSM interpretation of B- and other constraints
G. Isidori, F. Mescia, P. Paradisi, D. Temes: hep-ph/07030351.01 < Rbs < 1.24 (1 sigma): blue lines
0.8 < R‘B < 0.9 (future guess!): black lines
current 1-sigma would be 0.7 < R‘B < 1.3
NB: 2nd solution for mH < 200GeV not shown!
B → μ+μ− < 8.0 × 10−8: allowed below green linemBs
= 17.35 ± 0.25 ps−1 : allowed below gray line
(g-2)μ: 2 < aμ(exp− SM)/10−9 < 4 : purple lines
Dark Matter (~Bino) density: light blue forbidden
M˜q = 1.5 TeV AU = −1 TeVμ = 1.0 TeVM˜ℓ = 0.4
TeV
M˜q = 1.5 TeV AU = −1 TeVμ = 0.5 TeVM˜ℓ = 0.3
TeV
Two main production processes
for mH± < mt
gg t t bW bH±
for mH± > mt
bg tH± bW H±
Two main decay modesH± dominant for “small“ mH±
below 200 GeV (large tan 10)below 150 GeV (small tan )
H± tb,approaches for “large“ tan BR(tb)/BR() = (mb/m)2 ~ 6
H± at LHC
H±
±
95 130 170 215 310 mH±(GeV)
H±(f
b)
M. Schumacher, ATL-com-phys-2004-070
H±
t
z.B. für mH± > mt : tH± bW
Transversale Massenverteilung nach 30 fb-1
Entdeckungs und Ausschlusspotenzial (Alle Kanäle kombiniert)