Centre for Advanced Studies in Electronics Science and Technology

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Browsing Centre for Advanced Studies in Electronics Science and Technology by Author "Abhayasinghe, D. K."
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    Combinations of single-top-quark production cross-section measurements and |f < inf > LV < /inf > V < inf > tb < /inf > | determinations at √s = 7 and 8 TeV with the ATLAS and CMS experiments
    ( 2019-05-01) Aaboud, M. ; Aad, G. ; Abbott, B. ; Abbott, D. C. ; Abdinov, O. ; Abed Abud, A. ; Abhayasinghe, D. K. ; Abidi, S. H. ; AbouZeid, O. S. ; Abraham, N. L. ; Abramowicz, H. ; Abreu, H. ; Abulaiti, Y. ; Acharya, B. S. ; Adachi, S. ; Adam, L. ; Adamczyk, L. ; Adamek, L. ; Adelman, J. ; Adersberger, M. ; Adiguzel, A. ; Adorni, S. ; Adye, T. ; Affolder, A. A. ; Afik, Y. ; Agapopoulou, C. ; Agaras, M. N. ; Aggarwal, A. ; Agheorghiesei, C. ; Aguilar-Saavedra, J. A. ; Ahmadov, F. ; Ai, X. ; Aielli, G. ; Akatsuka, S. ; Åkesson, T. P.A. ; Akilli, E. ; Akimov, A. V. ; Al Khoury, K. ; Alberghi, G. L. ; Albert, J. ; Alconada Verzini, M. J. ; Alderweireldt, S. ; Aleksa, M. ; Aleksandrov, I. N. ; Alexa, C. ; Alexandre, D. ; Alexopoulos, T. ; Alfonsi, A. ; Alhroob, M. ; Ali, B. ; Alimonti, G. ; Alison, J. ; Alkire, S. P. ; Allaire, C. ; Allbrooke, B. M.M. ; Allen, B. W. ; Allport, P. P. ; Aloisio, A. ; Alonso, A. ; Alonso, F. ; Alpigiani, C. ; Alshehri, A. A. ; Alstaty, M. I. ; Alvarez Estevez, M. ; Alvarez Gonzalez, B. ; Álvarez Piqueras, D. ; Alviggi, M. G. ; Amaral Coutinho, Y. ; Ambler, A. ; Ambroz, L. ; Amelung, C. ; Amidei, D. ; Amor Dos Santos, S. P. ; Amoroso, S. ; Amrouche, C. S. ; An, F. ; Anastopoulos, C. ; Andari, N. ; Andeen, T. ; Anders, C. F. ; Anders, J. K. ; Andreazza, A. ; Andrei, V. ; Anelli, C. R. ; Angelidakis, S. ; Angelozzi, I. ; Angerami, A. ; Anisenkov, A. V. ; Annovi, A. ; Antel, C. ; Anthony, M. T. ; Antonelli, M. ; Antrim, D. J.A. ; Anulli, F. ; Aoki, M. ; Aparisi Pozo, J. A. ; Aperio Bella, L. ; Arabidze, G. ; Araque, J. P. ; Araujo Ferraz, V.
    This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at s = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb−1 at s = 7 TeV and 12.2 to 20.3 fb−1 at s = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t-channel, tW, and s-channel. The combined t-channel cross-sections are 67.5 ± 5.7 pb and 87.7 ± 5.8 pb at s = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at s = 7 and 8 TeV respectively. For the s-channel cross-section, the combination yields 4.9 ± 1.4 pb at s = 8 TeV. The square of the magnitude of the CKM matrix element Vtb multiplied by a form factor fLV is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related CKM matrix elements obey the relation |Vtd|, |Vts| ≪ |Vtb|. All the |fLVVtb|2 determinations, extracted from individual ratios at s = 7 and 8 TeV, are combined, resulting in |fLVVtb| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.[Figure not available: see fulltext.].