Search for pair-produced long-lived neutral particles decaying in the ATLAS hadronic calorimeter

H. WAHLBERG Y ATLAS COLLABORATION

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015

0370-2693

The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay ofa scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in20.3 fb􀀀1 of data collected in proton?proton collisions atps = 8 TeV. This search is sensitive to longlivedparticles that decay to Standard Model particles producing jets at the outer edge of the ATLASelectromagnetic calorimeter or inside the hadronic calorimeter. No significant excess of events isobserved. Limits are reported on the product of the scalar boson production cross section timesbranching ratio into long-lived neutral particles as a function of the proper lifetime of the particles.Limits are reported for boson masses from 100 GeV to 900 GeV, and a long-lived neutral particlemass from 10 GeV to 150 GeV.