A search is reported for the pair production of a new quark b′ with at least one b′ decaying to a Z boson and a bottom quark. The data, corresponding to 2.0  fb-1 of integrated luminosity, were collected from pp collisions at √s=7  TeV with the ATLAS detector at the CERN Large Hadron Collider. Using events with a b-tagged jet and a Z boson reconstructed from opposite-charge electrons, the mass distribution of large transverse momentum b′ candidates is tested for an enhancement. No evidence for a b′ signal is detected in the observed mass distribution, resulting in the exclusion at a 95% confidence level of b′ quarks with masses mb′<400  GeV that decay entirely via b′→Z+b. In the case of a vectorlike singlet b′ mixing solely with the third standard model generation, masses mb′<358  GeV are excluded.

Search for Pair Production of a New b^{′} Quark that Decays into a Z Boson and a Bottom Quark with the ATLAS Detector / G., A., B., A., J., A., S., A.K., A., A., A., A., O., A., B., A., M., A., O., A., H., A., H., A., E., A., B., A., L., A., D., A., T., A., J., A., M., A., S., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 109:7(2012). [10.1103/physrevlett.109.071801]

Search for Pair Production of a New b^{′} Quark that Decays into a Z Boson and a Bottom Quark with the ATLAS Detector

G. Artoni;BAGNAIA, Paolo;BINI, Cesare;DE CECCO, Sandro;DIONISI, Carlo;GAUZZI, Paolo;GENTILE, Simonetta;GIAGU, Stefano;M. Kado;LACAVA, Francesco;LUCI, Claudio;MESSINA, Andrea;MONZANI, SIMONE;A. Policicchio;SOLFAROLI CAMILLOCCI, ELENA;VANADIA, MARCO;VERDUCCI, MONICA;
2012

Abstract

A search is reported for the pair production of a new quark b′ with at least one b′ decaying to a Z boson and a bottom quark. The data, corresponding to 2.0  fb-1 of integrated luminosity, were collected from pp collisions at √s=7  TeV with the ATLAS detector at the CERN Large Hadron Collider. Using events with a b-tagged jet and a Z boson reconstructed from opposite-charge electrons, the mass distribution of large transverse momentum b′ candidates is tested for an enhancement. No evidence for a b′ signal is detected in the observed mass distribution, resulting in the exclusion at a 95% confidence level of b′ quarks with masses mb′<400  GeV that decay entirely via b′→Z+b. In the case of a vectorlike singlet b′ mixing solely with the third standard model generation, masses mb′<358  GeV are excluded.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Search for Pair Production of a New b^{′} Quark that Decays into a Z Boson and a Bottom Quark with the ATLAS Detector / G., A., B., A., J., A., S., A.K., A., A., A., A., O., A., B., A., M., A., O., A., H., A., H., A., E., A., B., A., L., A., D., A., T., A., J., A., M., A., S., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 109:7(2012). [10.1103/physrevlett.109.071801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/483059
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