Search for top-quark decays t -> Hq with 36 fb(-1) of pp collision data at root s=13 TeV with the ATLAS detector
| العنوان: | Search for top-quark decays t -> Hq with 36 fb(-1) of pp collision data at root s=13 TeV with the ATLAS detector |
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| المؤلفون: | Aaboud, M., Kastanas, Konstatinos A., Lund-Jensen, Bengt, Ohm, Christian, Ripellino, Giulia, Sidebo, P. Edvin, Strandberg, Jonas, Zwalinski, L., et al. |
| المصدر: | Journal of High Energy Physics (JHEP). (5) |
| مصطلحات موضوعية: | Hadron-Hadron scattering (experiments), Rare decay, Top physics, NNER A, NUCLEAR PHYSICS B, V358, P46 boud M. yy, EUROPEAN PHYSICAL JOURNAL C, V77, d G., son P, JOURNAL OF HIGH ENERGY PHYSICS, V76, boud M., PHYSICS LETTERS B, V762, P1 d G., uilar-Saavedra JA, ACTA PHYSICA POLONICA BMeeting on Particle Physics Phenomenology at High Energy Colliders, SEP 26-27, Montpellier, FRANCE, V35, P2695 |
| الوصف: | A search for flavour-changing neutral current decays of a top quark into an up-type quark (q = u, c) and the Standard Model Higgs boson, t Hq, is presented. The search is based on a dataset of pp collisions at = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 36.1 fb(-1). Two complementary analyses are performed to search for top-quark pair events in which one top quark decays into Wb and the other top quark decays into Hq, and target the Hbb and H (+-) decay modes, respectively. The high multiplicity of b-quark jets, or the presence of hadronically decaying -leptons, is exploited in the two analyses respectively. Multivariate techniques are used to separate the signal from the background, which is dominated by top-quark pair production. No significant excess of events above the background expectation is found, and 95% CL upper limits on the t Hq branching ratios are derived. The combination of these searches with ATLAS searches in diphoton and multilepton final states yields observed (expected) 95% CL upper limits on the t Hc and t Hu branching ratios of 1.1 x 10(-3) (8.3 x 10(-4)) and 1.2 x 10(-3) (8.3 x 10(-4)), respectively. The corresponding combined observed (expected) upper limits on the |(tcH)| and |(tuH)| couplings are 0.064 (0.055) and 0.066 (0.055), respectively. |
| وصف الملف: | |
| URL الوصول: | https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253736 https://doi.org/10.1007/JHEP05(2019)123 |
| قاعدة البيانات: | SwePub |
Find this article in full text from Springer Verlag. | تدمد: | 11266708 10298479 |
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| DOI: | 10.1007/JHEP05(2019)123 |