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A search for resonances decaying into a Higgs boson and a new particle $X$ in the $XH\rightarrow qqbb$ final state with the ATLAS detector.

D'Avanzo A., Auricchio S., Cirotto F., Conventi F. A., Rossi E.
Lunedì 12/09   14:00 - 19:00   Aula B - Maria Goeppert-Mayer   I - Fisica nucleare e subnucleare
A search for resonances decaying into a Higgs boson ($H$) and a new particle ($X$) is reported, utilizing proton-proton collision data with the ATLAS detector at the CERN Large Hadron Collider. The particle $X$ is assumed to decay to a pair of light quarks, and the fully hadronic final state is analyzed. A two-dimensional phase space of $XH$ mass $vs. X$ mass is scanned for evidence of a signal. Upper limits are set on the production cross-section of the resonance as a function of $XH$ and $X$ masses.