INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Search for anomalous production of prompt like-sign muon pairs and constraints on physics beyond the Standard Model with the ATLAS detector
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICAL REVIEW D
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2012 vol. 213 p. 1 - 23
ISSN:
1550-7998
Resumen:
An inclusive search for anomalous production of two prompt, isolated
muons with the same electric charge is presented. The search is
performed in a data sample corresponding to 1.6 fb^-1 of integrated
luminosity collected in 2011 at sqrt(s) = 7 TeV with the ATLAS detector
at the LHC. Muon pairs are selected by requiring two isolated muons of
the same electric charge with pT > 20 GeV and abs(eta) < 2.5.
Minimal requirements are placed on the rest of the event activity. The
distribution of the invariant mass of the muon pair m(mumu) is found to
agree well with the background expectation. Upper limits on the cross
section for anomalous production of two muons with the same electric
charge are placed as a function of m(mumu) within a fiducial region
defined by the event selection. The fiducial cross- section limit
constrains the like-sign top-quark pair-production cross section to be
below 3.7 pb at 95% confidence level. The data are also analyzed to
search for a narrow like-sign dimuon resonance as predicted for e.g.
doubly charged Higgs bosons (H++/H--). Assuming pair production of
H++/H-- bosons and a branching ratio to muons of 100% (33%), this
analysis excludes masses below 355 (244) GeV and 251 (209) GeV for
H++/H-- bosons coupling to left-handed and right-handed fermions,
respectively.