Pair production of color-octet scalars at the LHC
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Heavy colored scalar particles, which exist in many models of new physics, can be pair produced at the LHC via gluon-gluon fusion and possibly form quarkoniumlike bound states. If the scalars are also charged under the electroweak gauge group, these bound states can then decay into electroweak bosons. This yields a resonant cross section for final states such as γγ that can exceed standard model backgrounds. This paper studies this process in the Manohar-Wise model of color-octet scalars (COS). Important threshold logarithms and final state Coulomb-like QCD interactions are resummed using effective field theory. We compute the resummed cross section for gluon-gluon fusion to COS pairs at the LHC as well as the resonant cross section for octetonium decaying to γγ. The latter cross section exceeds the standard model diphoton cross section when the COS mass is less than 500 (350) GeV for √s=14(7)TeV. Nonobservation of resonances below these energies can significantly improve existing bounds on COS masses. © 2010 The American Physical Society.
Published Version (Please cite this version)10.1103/PhysRevD.82.075017
Publication InfoIdilbi, A; Kim, C; & Mehen, T (2010). Pair production of color-octet scalars at the LHC. Physical Review D - Particles, Fields, Gravitation and Cosmology, 82(7). pp. 75017. 10.1103/PhysRevD.82.075017. Retrieved from http://hdl.handle.net/10161/4280.
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Professor of Physics
Prof.~Thomas Mehen works primarily on Quantum Chromodynamics (QCD) and the application of effective field theory (EFT) to problems in hadronic physics. EFTs rely on three key ideas: i) identifying the relevant degrees of freedom for a specific physical process; ii) using symmetries of QCD to simplify or constrain the form of interactions; and iii) finding small parameters, either small coupling constants or ratios of disparate mass scales, which can be used to formulate systematic perturbativ