ZBORNIK POVZETKOV - Soft Matter Laboratory

Higgs Uncovering Light Scalar Remnants of High Scale Matter Unification
Ilja Dorˇsner ∗
Department of Physics, University of Sarajevo, Zmaja od Bosne 33-35, 71000 Sarajevo, Bosnia and Herzegovina
Svjetlana Fajfer †
Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia and
J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana, Slovenia
Admir Greljo ‡
J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana, Slovenia
Jernej F. Kamenik §
J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana, Slovenia and
Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
I. ABSTRACT
We consider impact of light colored scalars that can couple directly to matter fields on recently measured h → γγ
excess. Among all possible candidates we find that only two different scalar states—(8, 2, 1/2) and (6, 3, −1/3)—
individually influence the excess in a satisfactory way and are in excellent agreement with all available data. The
colored states must have a substantial coupling to the Standard Model Higgs of order one and a very small mass
of order 300 GeV in order to explain the data. We use the best fit values to generate predictions for h → Zγ. We
furthermore discuss where and how these states appear in extensions of the Standard Model with primary focus on
scenarios of matter unification. We revisit two simple SU(5) setups to show that these two full-fledged models not
only accommodate light color octet state but correlate its mass with observable partial proton decay lifetimes.
∗ Electronic address:ilja.dorsner@ijs.si
† Electronic address:svjetlana.fajfer@ijs.si
‡ Electronic address:admir.greljo@ijs.si
§ Electronic address:jernej.kamenik@ijs.si
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