Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV

Autores: Anduaga, Xabier Sebastián; Dova, María Teresa; Monticelli, Fernando Gabriel; Tripiana, Martín F.; The ATLAS Collaboration
Año de publicación: 2012
Idioma: inglés
Tipo de recurso: artículo
Estado: versión publicada
Descripción: The results of a search for pair production of the lighter scalar partners of top quarks ( ${\tilde{t}}_{1}$ ) in 2.05 fb−1 of pp collisions at $\sqrt{s} = 7$ TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons ( $e, μ$ ) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking ‘natural’ scenarios, where the neutralino ( ${\tilde{χ}}_{1}^{0}$ ) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for $115 GeV < m_{{\tilde{χ}}_{1}^{0}} < 230 GeV$ at 95% confidence level, reaching an exclusion of $m_{{\tilde{t}}_{1}} < 330 GeV$ for $m_{{\tilde{χ}}_{1}^{0}} = 190 GeV$ . Scalar top quark masses below 240 GeV are excluded for all values of $m_{{\tilde{χ}}_{1}^{0}} > m_{Z}$ .
Facultad de Ciencias Exactas
Materia: Ciencias Exactas
Física
ATLAS detector
scalar top quark pair production
supersymmetry
pp collisions
Nivel de accesibilidad: acceso abierto
Condiciones de uso: http://creativecommons.org/licenses/by/4.0/
Repositorio
Institución: Universidad Nacional de La Plata
OAI Identificador: oai:sedici.unlp.edu.ar:10915/77531

Acceder

id	SEDICI_2433d998caf4c72493fe3083d52a8006
oai_identifier_str	oai:sedici.unlp.edu.ar:10915/77531
network_acronym_str	SEDICI
repository_id_str	1329
network_name_str	SEDICI (UNLP)
spelling	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeVAnduaga, Xabier SebastiánDova, María TeresaMonticelli, Fernando GabrielTripiana, Martín F.The ATLAS CollaborationCiencias ExactasFísicaATLAS detectorscalar top quark pair productionsupersymmetrypp collisionsThe results of a search for pair production of the lighter scalar partners of top quarks (<math><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></math>) in 2.05 fb−1 of pp collisions at <math><msqrt is="true"><mi is="true">s</mi></msqrt><mo is="true">=</mo><mn is="true">7</mn></math> TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (<math><mi is="true">e</mi><mo is="true">,</mo><mi is="true">μ</mi></math>) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking ‘natural’ scenarios, where the neutralino (<math><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></math>) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for <math><mn is="true">115</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext><mo is="true"><</mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true"><</mo><mn is="true">230</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> at 95% confidence level, reaching an exclusion of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></mrow></msub><mo is="true"><</mo><mn is="true">330</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> for <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">=</mo><mn is="true">190</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math>. Scalar top quark masses below 240 GeV are excluded for all values of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">></mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><mi is="true">Z</mi></mrow></msub></math>.Facultad de Ciencias Exactas2012-08-29info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf44-60http://sedici.unlp.edu.ar/handle/10915/77531enginfo:eu-repo/semantics/altIdentifier/issn/0370-2693info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2012.07.010info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-03T10:44:24Zoai:sedici.unlp.edu.ar:10915/77531Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 10:44:24.915SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
spellingShingle	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV Anduaga, Xabier Sebastián Ciencias Exactas Física ATLAS detector scalar top quark pair production supersymmetry pp collisions
title_short	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_full	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_fullStr	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_full_unstemmed	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
title_sort	Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV
dc.creator.none.fl_str_mv	Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín F. The ATLAS Collaboration
author	Anduaga, Xabier Sebastián
author_facet	Anduaga, Xabier Sebastián Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín F. The ATLAS Collaboration
author_role	author
author2	Dova, María Teresa Monticelli, Fernando Gabriel Tripiana, Martín F. The ATLAS Collaboration
author2_role	author author author author
dc.subject.none.fl_str_mv	Ciencias Exactas Física ATLAS detector scalar top quark pair production supersymmetry pp collisions
topic	Ciencias Exactas Física ATLAS detector scalar top quark pair production supersymmetry pp collisions
dc.description.none.fl_txt_mv	The results of a search for pair production of the lighter scalar partners of top quarks (<math><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></math>) in 2.05 fb−1 of pp collisions at <math><msqrt is="true"><mi is="true">s</mi></msqrt><mo is="true">=</mo><mn is="true">7</mn></math> TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (<math><mi is="true">e</mi><mo is="true">,</mo><mi is="true">μ</mi></math>) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking ‘natural’ scenarios, where the neutralino (<math><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></math>) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for <math><mn is="true">115</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext><mo is="true"><</mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true"><</mo><mn is="true">230</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> at 95% confidence level, reaching an exclusion of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></mrow></msub><mo is="true"><</mo><mn is="true">330</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> for <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">=</mo><mn is="true">190</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math>. Scalar top quark masses below 240 GeV are excluded for all values of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">></mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><mi is="true">Z</mi></mrow></msub></math>. Facultad de Ciencias Exactas
description	The results of a search for pair production of the lighter scalar partners of top quarks (<math><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></math>) in 2.05 fb−1 of pp collisions at <math><msqrt is="true"><mi is="true">s</mi></msqrt><mo is="true">=</mo><mn is="true">7</mn></math> TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (<math><mi is="true">e</mi><mo is="true">,</mo><mi is="true">μ</mi></math>) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking ‘natural’ scenarios, where the neutralino (<math><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></math>) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for <math><mn is="true">115</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext><mo is="true"><</mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true"><</mo><mn is="true">230</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> at 95% confidence level, reaching an exclusion of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msub is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">t</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></mrow></msub><mo is="true"><</mo><mn is="true">330</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math> for <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">=</mo><mn is="true">190</mn><mtext is="true"></mtext><mtext is="true">GeV</mtext></math>. Scalar top quark masses below 240 GeV are excluded for all values of <math><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><msubsup is="true"><mrow is="true"><mover accent="true" is="true"><mi is="true">χ</mi><mo is="true">˜</mo></mover></mrow><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mn is="true">0</mn></mrow></msubsup></mrow></msub><mo is="true">></mo><msub is="true"><mrow is="true"><mi is="true">m</mi></mrow><mrow is="true"><mi is="true">Z</mi></mrow></msub></math>.
publishDate	2012
dc.date.none.fl_str_mv	2012-08-29
dc.type.none.fl_str_mv	info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo
format	article
status_str	publishedVersion
dc.identifier.none.fl_str_mv	http://sedici.unlp.edu.ar/handle/10915/77531
url	http://sedici.unlp.edu.ar/handle/10915/77531
dc.language.none.fl_str_mv	eng
language	eng
dc.relation.none.fl_str_mv	info:eu-repo/semantics/altIdentifier/issn/0370-2693 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2012.07.010
dc.rights.none.fl_str_mv	info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv	openAccess
rights_invalid_str_mv	http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv	application/pdf 44-60
dc.source.none.fl_str_mv	reponame:SEDICI (UNLP) instname:Universidad Nacional de La Plata instacron:UNLP
reponame_str	SEDICI (UNLP)
collection	SEDICI (UNLP)
instname_str	Universidad Nacional de La Plata
instacron_str	UNLP
institution	UNLP
repository.name.fl_str_mv	SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv	alira@sedici.unlp.edu.ar
_version_	1842260315337654272
score	13.13397

Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at √s = 7 TeV

Publicaciones similares