info:eu-repo/semantics/article
A search for pairs of highly collimated photon-jets in pp collisions at s√ = 13 TeV with the ATLAS detector
Fecha
2018-08Registro en:
Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B.; et al.; A search for pairs of highly collimated photon-jets in pp collisions at s√ = 13 TeV with the ATLAS detector; American Physical Society; Physical Review D: Particles, Fields, Gravitation and Cosmology; D99; 8-2018; 012008-51
1550-7998
CONICET Digital
CONICET
Autor
Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, Maria Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernan Pablo
Bossio Sola, Jonathan David
Daneri, María Florencia
Devesa, Maria Roberta
Marceca, Gino
Otero y Garzon, Gustavo Javier
Piegaia, Ricardo Nestor
Sacerdoti, Sabrina
Zinonos, Z.
Zinser, M.
Ziolkowski, M.
Živković, L.
Zobernig, G.
Zoccoli, A.
Zoch, K.
Nedden, M. zur
Zorbas, T. G.
Zou, R.
Zwalinski, L.
The ATLAS Collaboration
Resumen
Results of a search for the pair production of photon-jets collimated groupings of photons in the ATLAS detector at the Large Hadron Collider are reported. Highly collimated photon-jets can arise from the decay of new, highly boosted particles that can decay to multiple photons collimated enough to be identified in the electromagnetic calorimeter as a single, photonlike energy cluster. Data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36.7 fb-1, were collected in 2015 and 2016. Candidate photon-jet pair production events are selected from those containing two reconstructed photons using a set of identification criteria much less stringent than that typically used for the selection of photons, with additional criteria applied to provide improved sensitivity to photon-jets. Narrow excesses in the reconstructed diphoton mass spectra are searched for. The observed mass spectra are consistent with the Standard Model background expectation. The results are interpreted in the context of a model containing a new, high-mass scalar particle with narrow width, X, that decays into pairs of photon-jets via new, light particles, a. Upper limits are placed on the cross section times the product of branching ratios σ×B(X→aa)×B(a→γγ)2 for 200 GeV