Results 1 - 10 of 19303
Results 1 - 10 of 19303. Search took: 0.033 seconds
|Sort by: date | relevance|
[en] The latest experimental results concerning the top quark physics obtained by the experiments at Large Hadron Colliders using the data produced in proton-proton collisions at √s = 7 and 8 TeV are shown. The data were collected by the ATLAS detector in 2011 (7 TeV) and 2012 (8 TeV) with the integrated luminosity of 4.9 fb−1 and 21 fb−1 and the CMS detector at the same collision energies with the integrated luminosity of 5 fb−1 and 20 fb−1, respectively. The results on different aspects of the top quark studies including searches of physics beyond the Standard Model are also reported. No signs of physics beyond the Standard Model has been found so far. (author)
[en] We consider p–p collisions at very high energy. This becomes relevant in view of the Lhc which has just resumed operation. Such collisions will take place in it and indeed already have taken place. Though recent results at the Tevatron in the U.S. seem to rule out the Higgs bosons, there are other results which are eagerly expected, some of these are surveyed here. (author)
[en] Theoretical and experimental limits on the Higgs boson mass restrict CKM mixing of a possible fourth family beyond the constraints previously obtained from precision electroweak data alone. Existing experimental and theoretical bounds on mH already significantly restrict the allowed parameter space. Zero CKM mixing is excluded and mixing of order θCabbibo is allowed. Upper and lower limits on 3-4 CKM mixing are exhibited as a function of mH. We use the default inputs of the Electroweak Working Group and also explore the sensitivity of both the three and four family fits to alternative inputs.
[en] Assuming the Minimal Standard Model (MSM) Higgs sector the present electroweak data concerning their sensitivity to the Higgs-boson mass are analyzed. Already the LEP data alone show a sensitivity to the Higgs-boson mass. Together with all other electroweak data from the SLC, the bar p-colliders, the νN-experiments and in particular the CDF top-quark mass determination it is possible to give an upper 95% CL limit (corresponding to an increase of 2.7 in χ2) of 490 GeV for the Higgs-boson mass. Extrapolating the current experiments to 1995 one finds that the LEP data alone even in the most optimistic case will not give a useful upper limit on mH. The measurement of the W-boson mass at LEP200 will also not significantly improve the sensitivity to mH. However in combination with all other electroweak data in 1995 an interesting upper limit on MH could be reached. If the Higgs-boson is not discovered at LEP200 the significance of the data will not be strong enough to exclude the MSM
[en] We search for a light Higgs boson A0 in the radiative decay Y(3S) → γA0, A0 → T+T-, T+ → e+νeνT, or T+ → μ+ νμT. The data sample contains 122 x 106 Y(3S) events recorded with the BABAR detector. We find no evidence for a narrow structure in the studied T+T- invariant mass region of 4.03 < mT+T- < 10.10 GeV/c2. We exclude at the 90% confidence level (C.L.) a low-mass Higgs boson decaying to T+T- with a product branching fraction B(Y(3S) → γA0) x B(A0 → T+T-) > (1.5-16) x 10-5 across the mT+T- range. We also set a 90% C.L. upper limit on the T+T- decay of the ηb at B(ηb → T+T-) < 8%.
[en] Recent astrophysical and terrestrial experiments have motivated the proposal of a dark sector with GeV-scale gauge boson force carriers and new Higgs bosons. We present a search for a dark Higgs boson using 516 fb-1 of data collected with the BABAR detector. We do not observe a significant signal and we set 90% confidence level upper limits on the product of the Standard Model-dark sector mixing angle and the dark sector coupling constant.
[en] I will review the scenario in which general relativistic 'warping' of higher-dimensional space-time is a core unifying principle underlying microphysics. I will give a non-technical account of the basic theory in its current (but less well-known) form and its implications for past and future experiments. I will also discuss the deep connection to the scenario in which the Higgs boson is a composite of other particles.