Skip to Main content Skip to Navigation
Conference papers

Scalar diquark in top-antitop production and constraints on Yukawa sector of grand unified theories

Abstract : A colored weak singlet scalar state with hypercharge 4/3 is one of the possible candidates for the explanation of the unexpectedly large forward-backward asymmetry in tt production as measured by the CDF and D0 experiments. We investigate the role of this state in a plethora of flavor chang- ing neutral current processes and precision observables of down-quarks and charged leptons. Our analysis includes tree- and loop-level mediated observables in the K and B systems, the charged lepton sector, as well as the Z → b ¯b width. We perform a fit of the relevant scalar couplings. This approach can explain the (g − 2)µ anomaly while tensions among the CP violating observables in the quark sector, most notably the nonstandard CP phase (and width difference) in the Bs system cannot be fully relaxed. The results are interpreted in a class of GUT models which allow for a light colored scalar with a mass below 1 TeV.
Complete list of metadatas

Cited literature [2 references]  Display  Hide  Download

http://hal.in2p3.fr/in2p3-00702778
Contributor : Sabine Starita <>
Submitted on : Thursday, May 31, 2012 - 12:04:01 PM
Last modification on : Wednesday, September 16, 2020 - 5:38:30 PM
Long-term archiving on: : Saturday, September 1, 2012 - 2:24:03 AM

File

EPS-HEP2011_380.pdf
Publisher files allowed on an open archive

Identifiers

  • HAL Id : in2p3-00702778, version 1

Collections

IN2P3 | LAL | CNRS

Citation

N. Kosnik, I. Dorsner, J. Drobnak, S. Fajfer, J.F. Kamenik. Scalar diquark in top-antitop production and constraints on Yukawa sector of grand unified theories. XXIst International Europhysics Conference on High Energy Physics (HEP 2011), Jul 2011, Grenoble, France. ⟨in2p3-00702778⟩

Share

Metrics

Record views

215

Files downloads

505