Search for Maximal Flavor Violating Scalars in Same-Charge Lepton Pairs in $p \bar{p}$ Collisions at $\sqrt{s}$ = 1.96-TeV

Aaltonen, T.; Adelman, Jahred A.; Akimoto, T.; Albrow, M.G.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.

doi:10.1103/PhysRevLett.102.041801

Search for Maximal Flavor Violating Scalars in Same-Charge Lepton Pairs in $p \bar{p}$ Collisions at $\sqrt{s}$ = 1.96-TeV

CDF

Collaboration

Sep, 2008

4 pages

Published in:

Phys.Rev.Lett. 102 (2009) 041801

e-Print:

0809.4903 [hep-ex]

DOI:

10.1103/PhysRevLett.102.041801

Report number:

FERMILAB-PUB-08-420-E

Experiments:

FNAL-E-0830

View in:

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reference search33 citations

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Abstract: (arXiv)

Models of Maximal Flavor Violation (MxFV) in elementary particle physics may contain at least one new scalar SU

(2)

doublet field

\Phi_{FV} = (\eta^0,\eta^+)

that couples the first and third generation quarks (

q_1,q_3

) via a Lagrangian term

\mathcal{L}_{FV} = \xi_{13} \Phi_{FV} q_1 q_3

. These models have a distinctive signature of same-charge top-quark pairs and evade flavor-changing limits from meson mixing measurements. Data corresponding to 2 fb

^{-1}

collected by the CDF II detector in

p\bar{p}

collisions at

\sqrt{s} = 1.96

TeV are analyzed for evidence of the MxFV signature. For a neutral scalar

\eta^0

with

m_{\eta^0} = 200

GeV/

c^2

and coupling

\xi_{13}=1

,

\sim

11 signal events are expected over a background of

2.1 \pm 1.8

events. Three events are observed in the data, consistent with background expectations, and limits are set on the coupling

\xi_{13}

for

m_{\eta^0} = 180-300

GeV/

c^2

.

Note:

4 pages, 3 figures

13.85.Ni
12.15.Ff
13.85.Qk
12.60.Fr
anti-p p: interaction
flavor: violation
scalar particle: neutral particle
scalar particle: exchange
scalar particle: hadronic decay
top: pair production

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Figures(4)

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Search for Maximal Flavor Violating Scalars in Same-Charge Lepton Pairs in ppˉp \bar{p}ppˉ​ Collisions at s\sqrt{s}s​ = 1.96-TeV

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Search for Maximal Flavor Violating Scalars in Same-Charge Lepton Pairs in $p \bar{p}$ Collisions at $\sqrt{s}$ = 1.96-TeV