Search for light top squark pair production in final states with leptons and b⁻ jets with the ATLAS detector in sqrts=7 TeV proton-proton collisions


Autoria(s): ATLAS, Collaboration; Agustoni, Marco; Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Topfel, Cyril; Weber, Michael
Data(s)

2013

Resumo

The results of a search for pair production of light top squarks are presented, using 4.7 fb(-1) of root s = 7 TeV proton-proton collisions collected with the ATLAS detector at the Large Hadron Collider. This search targets top squarks with masses similar to, or lighter than, the top quark mass. Final states containing exclusively one or two leptons (e, mu), large missing transverse momentum, light-flavour jets and b-jets are used to reconstruct the top squark pair system. Event-based mass scale variables are used to separate the signal from a large t (t) over bar background. No excess over the Standard Model expectations is found. The results are interpreted in the framework of the Minimal Supersymmetric Standard Model, assuming the top squark decays exclusively to a chargino and a b-quark, while requiring different mass relationships between the Supersymmetric particles in the decay chain. Light top squarks with masses between 123-167 GeV are excluded for neutralino masses around 55 GeV.

Formato

application/pdf

application/pdf

Identificador

http://boris.unibe.ch/58411/1/1209.2102v2.pdf

http://boris.unibe.ch/58411/2/1-s2.0-S0370269313000907-main.pdf

ATLAS, Collaboration; Agustoni, Marco; Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Topfel, Cyril; Weber, Michael (2013). Search for light top squark pair production in final states with leptons and b⁻ jets with the ATLAS detector in sqrts=7 TeV proton-proton collisions. Physics letters. B, 720(1-3), pp. 13-31. Elsevier 10.1016/j.physletb.2013.01.049 <http://dx.doi.org/10.1016/j.physletb.2013.01.049>

doi:10.7892/boris.58411

info:doi:10.1016/j.physletb.2013.01.049

urn:issn:0370-2693

Idioma(s)

eng

Publicador

Elsevier

Relação

http://boris.unibe.ch/58411/

Direitos

info:eu-repo/semantics/openAccess

info:eu-repo/semantics/openAccess

Fonte

ATLAS, Collaboration; Agustoni, Marco; Ancu, Lucian; Battaglia, Andreas; Beck, Hans Peter; Borer, Claudia; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Topfel, Cyril; Weber, Michael (2013). Search for light top squark pair production in final states with leptons and b⁻ jets with the ATLAS detector in sqrts=7 TeV proton-proton collisions. Physics letters. B, 720(1-3), pp. 13-31. Elsevier 10.1016/j.physletb.2013.01.049 <http://dx.doi.org/10.1016/j.physletb.2013.01.049>

Palavras-Chave #530 Physics
Tipo

info:eu-repo/semantics/article

info:eu-repo/semantics/publishedVersion

PeerReviewed