Measurement of the $t\bar{t}$ production cross-section using $eμ$ events with $b$-tagged jets in $pp$ collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS detector
ArXiv 1406.5375 (2014)
Abstract:
The inclusive top quark pair ($t\bar{t}$) production cross-section $\sigma_{t\bar{t}}$ has been measured in $pp$ collisions at $\sqrt{s}=7$ TeV and $\sqrt{s}=8$ TeV with the ATLAS experiment at the LHC, using $t\bar{t}$ events with an opposite-charge $e\mu$ pair in the final state. The measurement was performed with the 2011 7 TeV dataset corresponding to an integrated luminosity of 4.6 fb$^{-1}$ and the 2012 8 TeV dataset of 20.3 fb$^{-1}$. The cross-section was measured to be: $\sigma_{t\bar{t}}=182.9\pm 3.1\pm 4.2\pm 3.6 \pm 3.3$ pb ($\sqrt{s}=7$ TeV) and $\sigma_{t\bar{t}}=242.9\pm 1.7\pm 5.5\pm 5.1\pm 4.2$ pb ($\sqrt{s}=8$ TeV, updated as described in the Addendum), where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the knowledge of the integrated luminosity and of the LHC beam energy. The results are consistent with recent theoretical QCD calculations at next-to-next-to-leading order. Fiducial measurements corresponding to the experimental acceptance of the leptons are also reported, together with the ratio of cross-sections measured at the two centre-of-mass energies. The inclusive cross-section results were used to determine the top quark pole mass via the dependence of the theoretically-predicted cross-section on $m_t^{\rm pole}$, giving a result of $m_t^{\rm pole}=172.9^{+2.5}_{-2.6}$ GeV. By looking for an excess of $t\bar{t}$ production with respect to the QCD prediction, the results were also used to place limits on the pair-production of supersymmetric top squarks $\tilde{t}_1$ with masses close to the top quark mass decaying via $\tilde{t}_1\rightarrow t\tilde{\chi}^0_1$ to predominantly right-handed top quarks and a light neutralino $\tilde{\chi}_0^1$, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 177 GeV are excluded at the 95% confidence level.Measurements of Four-Lepton Production at the Z Resonance in pp Collisions at s=7 and 8 TeV with ATLAS
Physical Review Letters American Physical Society (APS) 112:23 (2014) 231806
Authors:
G Aad, B Abbott, J Abdallah, S Abdel Khalek, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, R Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, J Adelman, S Adomeit, T Adye, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, A Ahmad, F Ahmadov, G Aielli, H Akerstedt, TPA Åkesson, G Akimoto, AV Akimov, GL Alberghi, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, G Alimonti, L Alio, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, A Alonso, F Alonso, C Alpigiani, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, Y Amaral Coutinho, C Amelung, D Amidei, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, G Amundsen, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, S Angelidakis, I Angelozzi, P Anger, A Angerami, F Anghinolfi, AV Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, JP Araque, ATH Arce, J-F Arguin, S Argyropoulos, M Arik, AJ Armbruster, O Arnaez, V Arnal, H Arnold, O Arslan, A Artamonov, G Artoni, S Asai, N Asbah, A Ashkenazi, B Åsman, L Asquith, K Assamagan, R Astalos, M Atkinson, NB Atlay, B Auerbach, K Augsten, M Aurousseau, G Avolio, G Azuelos, Y Azuma, MA Baak, C Bacci, H Bachacou, K Bachas, M Backes, M Backhaus, J Backus Mayes, E Badescu, P Bagiacchi, P Bagnaia, Y Bai, T Bain, JT Baines, OK Baker, S Baker, P Balek, F Balli, E Banas, Sw Banerjee, D Banfi, A Bangert, AAE Bannoura, V Bansal, HS Bansil, L Barak, SP Baranov, EL Barberio, D Barberis, M Barbero, T Barillari, M Barisonzi, T Barklow, N Barlow, BM Barnett, RM Barnett, Z Barnovska, A Baroncelli, G Barone, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, R Bartoldus, AE Barton, P Bartos, V Bartsch, A Bassalat, A Basye, RL Bates, L Batkova, JR Batley, M Battistin, F 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Yu, JM Yu, J Yu, L Yuan, A Yurkewicz, B Zabinski, R Zaidan, AM Zaitsev, A Zaman, S Zambito, L Zanello, D Zanzi, A Zaytsev, C Zeitnitz, M Zeman, A Zemla, K Zengel, O Zenin, T Ženiš, D Zerwas, G Zevi della Porta, D Zhang, F Zhang, H Zhang, J Zhang, L Zhang, X Zhang, Z Zhang, Z Zhao, A Zhemchugov, J Zhong, B Zhou, L Zhou, N Zhou, CG Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, A Zibell, D Zieminska, NI Zimine, C Zimmermann, R Zimmermann, S Zimmermann, S Zimmermann, Z Zinonos, M Ziolkowski, G Zobernig, A Zoccoli, M zur Nedden, G Zurzolo, V Zutshi, L ZwalinskiSearch for top quark decays t → qH with H → γγ using the ATLAS detector
Journal of High Energy Physics Springer Berlin Heidelberg 2014:6 (2014) 8
Authors:
G Aad, B Abbott, J Abdallah, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, R Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, J Adelman, S Adomeit, T Adye, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, F Ahmadov, G AielliAbstract:
A search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type (c, u) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb-1 at √ = 7TeV and 20.3fb-1 at √ = 8TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for in which one top quark decays to qH and the other decays to bW. Both the hadronic and the leptonic decay modes of the W boson are used. No significant signal is observed and an upper limit is set on the t → qH branching ratio of 0.79 at the 95% confidence level. The corresponding limit on the tqH coupling combination λtcH 2 + λtuH 2 is 0.17.Corrigendum to “Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC” [Phys. Lett. B 726 (1–3) (2013) 88]
Physics Letters B Elsevier 734 (2014) 406
Measurement of the low-mass Drell-Yan differential cross section at s = 7 TeV using the ATLAS detector
Journal of High Energy Physics Springer Nature 2014:6 (2014) 112