A search is presented for same-sign top-quark production and down-type heavy quarks of charge −1/3 in events with two isolated leptons (e or μ) that have the same electric charge, at least two jets and large missing transverse momentum. The data are selected from pp collisions at ps = 7 TeV recorded by the ATLAS detector and correspond to an integrated luminosity of 1.04 fb−1. The observed data are consistent with expectations from Standard Model processes. Upper limits are set at 95% confidence level on the cross section of new sources of same-sign top-quark pair production of 1.4-2.0 pb depending on the assumed mediator mass. Upper limits are also set on the pair-production cross-section for new heavy down-type quarks; a lower limit of 450 GeV is set at 95% confidence level on the mass of heavy down-type quarks under the assumption that they decay 100% of the time to Wt.

Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $ with the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A.A., Abdesselam, A., Abdinov, O., Abi, B., Abolins, M., Abouzeid, O.S., Abramowicz, H., Abreu, H., Acerbi, E., Acharya, B.S., Adamczyk, L., Adams, D.L., Addy, T.N., Adelman, J., Aderholz, M., Adomeit, S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2012:4(2012). [10.1007/jhep04(2012)069]

Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $ with the ATLAS detector

G. Artoni;BAGNAIA, Paolo;BINI, Cesare;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 presented for same-sign top-quark production and down-type heavy quarks of charge −1/3 in events with two isolated leptons (e or μ) that have the same electric charge, at least two jets and large missing transverse momentum. The data are selected from pp collisions at ps = 7 TeV recorded by the ATLAS detector and correspond to an integrated luminosity of 1.04 fb−1. The observed data are consistent with expectations from Standard Model processes. Upper limits are set at 95% confidence level on the cross section of new sources of same-sign top-quark pair production of 1.4-2.0 pb depending on the assumed mediator mass. Upper limits are also set on the pair-production cross-section for new heavy down-type quarks; a lower limit of 450 GeV is set at 95% confidence level on the mass of heavy down-type quarks under the assumption that they decay 100% of the time to Wt.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $ with the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A.A., Abdesselam, A., Abdinov, O., Abi, B., Abolins, M., Abouzeid, O.S., Abramowicz, H., Abreu, H., Acerbi, E., Acharya, B.S., Adamczyk, L., Adams, D.L., Addy, T.N., Adelman, J., Aderholz, M., Adomeit, S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2012:4(2012). [10.1007/jhep04(2012)069]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/449375
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