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Measurement of the B-8 solar neutrino flux in SNO plus with very low backgrounds

PHYSICAL REVIEW D 99:1 (2019) ARTN 012012

Authors:

M Anderson, S Andringa, S Asahi, M Askins, DJ Auty, N Barros, D Bartlett, F Barao, R Bayes, EW Beier, A Bialek, SD Biller, E Blucher, R Bonventre, M Boulay, E Caden, EJ Callaghan, J Caravaca, D Chauhan, M Chen, O Chkvorets, B Cleveland, C Connors, IT Coulter, MM Depatie, F Di Lodovico, F Duncan, J Dunger, E Falk, V Fischer, E Fletcher, R Ford, N Gagnon, K Gilje, C Grant, J Grove, AL Hallin, D Hallman, S Hans, J Hartnell, WJ Heintzelman, RL Helmer, JL Hernandez-Hernandez, B Hreljac, J Hu, AS Inacio, CJ Jillings, T Kaptanoglu, P Khaghani, JR Klein, R Knapik, LL Kormos, B Krar, C Kraus, CB Krauss, T Kroupova, I Lam, BJ Land, R Lane, A LaTorre, I Lawson, L Lebanowski, EJ Leming, A Li, J Lidgard, B Liggins, Y Liu, V Lozza, M Luo, S Maguire, A Maio, S Manecki, J Maneira, RD Martin, E Marzec, A Mastbaum, N McCauley, AB McDonald, P Mekarski, M Meyer, M Mlejnek, I Morton-Blake, S Nae, M Nirkko, HM O'Keeffe, GD Orebi Gann, MJ Parnell, J Paton, SJM Peeters, T Pershing, L Pickard, D Pracsovics, G Prior, A Reichold, R Richardson, M Rigan, J Rose, R Rosero, J Rumleskie, I Semenec, K Singh, P Skensved, MI Stringer, R Svoboda, B Tam, L Tian, J Tseng, E Turner, R Van Berg, JGC Veinot, CJ Virtue, E Vazquez-Jauregui, J Wang, JJ Weigand, JR Wilson, P Woosaree, A Wright, JP Yanez, M Yeh, K Zuber, A Zummo, SNO Collaboration
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Search for scalar resonances decaying into $μ^{+}μ^{-}$ in events with and without $b$-tagged jets produced in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ArXiv 1901.08144 (2019)
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Measurement of the $t\bar{t}Z$ and $t\bar{t}W$ cross sections in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ArXiv 1901.03584 (2019)
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Search for pair production of Higgs bosons in the bb¯¯bb¯¯ final state using proton-proton collisions at s√=13 TeV with the ATLAS detector

Journal of High Energy Physics Springer Verlag 2019:1 (2019) 30

Authors:

M Aaboud, G Aad, B Abbott, Luca Ambroz, Giacomo Artoni, Moritz Backes, Alan Barr, Lydia Beresford, Daniela Bortoletto, JTP Burr, Amanda Cooper-Sarkar, James Frost, Elizabeth Gallas, F Giuli, Claire Gwenlan, CP Hays, Todd Huffman, Cigdem Issever, JKK Liu, Luigi Marchese, Koichi Nagai, Michael Nelson, Richard Nickerson, Nurfikri Norjoharuddeen, M Petrov, MA Pickering, Abhishek Sharma, Ian Shipsey, Cecilia Tosciri, Jeffrey Tseng, Georg Viehhauser, Luigi Vigani, Anthony Weidberg, Miha Zgubič

Abstract:

A search for Higgs boson pair production in the bb¯¯bb¯¯ final state is carried out with up to 36.1 fb−1 of LHC proton-proton collision data collected at s√=13 TeV with the ATLAS detector in 2015 and 2016. Three benchmark signals are studied: a spin-2 graviton decaying into a Higgs boson pair, a scalar resonance decaying into a Higgs boson pair, and Standard Model non-resonant Higgs boson pair production. Two analyses are carried out, each implementing a particular technique for the event reconstruction that targets Higgs bosons reconstructed as pairs of jets or single boosted jets. The resonance mass range covered is 260–3000 GeV. The analyses are statistically combined and upper limits on the production cross section of Higgs boson pairs times branching ratio to bb¯¯bb¯¯ are set in each model. No significant excess is observed; the largest deviation of data over prediction is found at a mass of 280 GeV, corresponding to 2.3 standard deviations globally. The observed 95% confidence level upper limit on the non-resonant production is 13 times the Standard Model prediction. Open image in new window
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Determination of the strong coupling constant αs(MZ) in next-to-next-to-leading order QCD using H1 jet cross section measurements

Proceedings of Science 340 (2019)

Authors:

D Britzger, V Bertone, J Currie, C Gwenlan, T Gehrmann, A Huss, J Niehues, M Sutton

Abstract:

The strong coupling constant is one of the least known parameters of the Standard Model (SM) and a precise knowledge is of great importance for precision physics and searches for physics beyond the SM at the LHC. The value of the strong coupling constant αs(MZ) is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic ep scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. Using inclusive jet and dijet data together, the strong coupling constant is determined to be αs(MZ) = 0.1157(20)exp(29)th. Complementary, αs(MZ) is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The value αs(MZ) = 0.1142(28)tot obtained is consistent with the determination from jet data alone. The impact of the jet data on the PDFs is studied. The running of the strong coupling is tested at different values of the renormalisation scale and the results are found to be in agreement with expectations.