Search for charged Higgs bosons through the violation of lepton universality in tt¯ events using pp collision data at s√=7 TeV with the ATLAS experiment

Abstract: In several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson H +, t → bH +, in addition to the Standard Model decay t → bW. Since W bosons decay to the three lepton generations equally, while H + maypredominantlydecayinto τν, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6 fb−1 of proton-proton collision data at s√=7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or μ) and/or a hadronically decaying τ (τ had) are used. Event yield ratios between e + τ had and e + μ, as well as between μ + τ had andμ + e, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction B (H + → τν) is 100%, upper limits in the range 3.2%–4.4% can be placed on the branching fraction B (t → bH +) for charged Higgs boson masses m H+ in the range 90–140 GeV. After combination with results from a search for charged Higgs bosons in tt¯ decays using the τ had + jets final state, upper limits on B (t → bH +) can be set in the range 0.8%–3.4%, for m H+ in the range 90-160 GeV

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch
• Notes: Journal of high energy physics. - 2013, 3 (2013) , 76, ISSN: 1029-8479

Contributors, Places and Time

• Event: Veröffentlichung
• (where): Freiburg
• (who): Universität
• (when): 2022
• Creator: Aad, Georges ; Ahles, Florian ; Barber, Thomas J. ; Bernhard, Ralf ; Böhler, Michael ; Bruneliere, Renaud ; Christov, Asen ; Consorti, Valerio ; Fehling-Kaschek, Mirjam ; Flechl, Martin ; Hartert, Jochen ; Herten, Gregor ; Horner, Stephan ; Jakobs, Karl ; Janus, Michel ; Kononov, A. I. ; Kühn, Susanne ; Lai, Stanley T. ; Landgraf, Ulrich ; Lohwasser, Kristin ; Ludwig, Inga ; Ludwig, Jens ; Mahboubi, Kambiz ; Mohr, Wolfgang ; Nilsen, Halvor Moll ; Parzefall, Ulrich ; Rammensee, Michael ; Rave, Tobias ; Rúriková, Zuzana ; Ruthmann, Nils ; Schmidt, Evelyn ; Schumacher, Markus ; Siegert, Frank ; Störig, Kathrin ; Sundermann, Jan Erik ; Temming, Kim ; Thoma, Sascha ; Tsiskaridze, Vakhtang ; Ungaro, Francesca Consiglia ; Venturi, Manuela ; Vivarelli, Iacopo ; Radziewski, Holger von ; Vu Anh, Tuan ; Warsinsky, Markus ; Weiser, Christian ; Werner, Matthias ; Winkelmann, Stefan ; Xie, Song ; Zimmermann, Stephanie ; ATLAS Collaboration CERN

Further information

• DOI: 10.1007/jhep03(2013)076
• URN: urn:nbn:de:bsz:25-freidok-2234108
• Rights: Kein Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:38 AM CEST