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
- Creators
- Aad, G.
- Perez, K.
- ATLAS Collaboration
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^+ may predominantly decay into 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) and μ + 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.
Additional Information
© 2013 CERN, for the benefit of the ATLAS collaboration. Received: December 14, 2012. Revised: February 6, 2013. Accepted: February 19, 2013. Published: March 13, 2013. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.Attached Files
Published - 10.1007_JHEP03_2013_076.pdf
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Additional details
- Eprint ID
- 38648
- Resolver ID
- CaltechAUTHORS:20130523-082807455
- ANPCyT (Argentina)
- YerPhl (Armenia)
- ARC (Australia)
- BMWF and FWF (Austria)
- ANAS (Azerbaijan)
- SSTC (Belarus)
- CNPq and FAPESP (Brazil)
- NSERC (Canada)
- NRC and CFI (Canada)
- CERN
- CONICYT (Chile)
- CAS
- MOST and NSFC (China)
- COLCIENCIAS (Colombia)
- MSMT CR (Czech Republic)
- MPO CR and VSC CR (Czech Republic)
- DNRF (Denmark)
- DNSRC and Lundbeck Foundation (Denmark)
- EPLANET
- ERC and NSRF
- European Union
- IN2P3-CNRS (France)
- CEA-DSM/IRFU (France)
- GNSF (Georgia)
- BMBF (Germany)
- DFG (Germany)
- HGF (Germany)
- MPG and AvH Foundation (Germany)
- GSRT and NSRF (Greece)
- ISF (Israel)
- MINERVA (Israel)
- GIF (Israel)
- DIP and Benoziyo Center (Israel)
- INFN (Italy)
- MEXT and JSPS (Japan)
- CNRST (Morocco)
- FOM and NWO (The Netherlands)
- BRF and RCN (Norway)
- MNiSW (Poland)
- GRICES and FCT (Portugal)
- MERYS (MECTS) (Romania)
- MES of Russia and ROSATOM
- Russian Federation
- JINR
- MSTD (Serbia)
- MSSR (Slovakia)
- ARRS and MVZT (Slovenia)
- DST/NRF (South Africa)
- MICINN (Spain)
- SRC and Wallenberg Foundation (Sweden)
- SER (Switzerland)
- SNSF and Cantons of Bern in Geneva (Switzerland)
- NSC (Taiwan)
- TAEK (Turkey)
- STFC (United Kingdom)
- Royal Society and Leverhulme Trust (United Kingdom)
- Department of Energy (DOE)
- NSF
- Created
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2013-05-24Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field