کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8190463 | 1528855 | 2012 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Search for FCNC single top-quark production at s=7 TeV with the ATLAS detector
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of s=7 TeV, corresponding to an integrated luminosity of 2.05 fbâ1, are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the tâWb branching fraction is measured to be ÏqgâtÃB(tâWb)<3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κugt/Î<6.9â
10â3 TeVâ1 and κcgt/Î<1.6â
10â2 TeVâ1, where Î is the new physics scale, and on the branching fractions B(tâug)<5.7â
10â5 and B(tâcg)<2.7â
10â4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 712, Issues 4â5, 12 June 2012, Pages 351-369
Journal: Physics Letters B - Volume 712, Issues 4â5, 12 June 2012, Pages 351-369
نویسندگان
ATLAS Collaboration ATLAS Collaboration, G. Aad, B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, M. Abolins, O.S. AbouZeid, H. Abramowicz, H. Abreu, E. Acerbi, B.S. Acharya, L. Adamczyk, D.L. Adams, T.N. Addy, J. Adelman,