6,376 research outputs found
Impact of top-Higgs couplings on di-Higgs production at future colliders
Measuring the Higgs-self coupling is one of the most crucial goals of the
future colliders, such as the LHC Run-II and the ILC-based photon collider.
Since the new physics can affects the di-Higgs production not only from the
Higgs self-coupling but also from the top-Higgs coupling, we investigate the
di-Higgs production in the presence of the non-standard top-Higgs coupling at
the LHC and ILC-based photon collider given the recent Higgs data. Due to the
changed interference behaviors of the top quark loops with itself or boson
loops, we find that the cross section of di-Higgs production at the LHC-14 TeV
and ILC-500 GeV can be respectively enhanced up to nearly 3 and 2 times the SM
predictions within 2 Higgs data allowed parameter region.Comment: 16 pages, references and discussions added, accepted by JHE
Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future
We present results from a state-of-the-art fit of electroweak precision
observables and Higgs-boson signal-strength measurements performed using 7 and
8 TeV data from the Large Hadron Collider. Based on the HEPfit package, our
study updates the traditional fit of electroweak precision observables and
extends it to include Higgs-boson measurements. As a result we obtain
constraints on new physics corrections to both electroweak observables and
Higgs-boson couplings. We present the projected accuracy of the fit taking into
account the expected sensitivities at future colliders.Comment: 34 pages, 30 figures, 23 table
Establishing the Isolated Standard Model
The goal of this article is to initiate a discussion on what it takes to
claim "there is no new physics at the weak scale," namely that the Standard
Model (SM) is "isolated." The lack of discovery of beyond the SM (BSM) physics
suggests that this may be the case. But to truly establish this statement
requires proving all "connected" BSM theories are false, which presents a
significant challenge. We propose a general approach to quantitatively assess
the current status and future prospects of establishing the isolated SM (ISM),
which we give a reasonable definition of. We consider broad elements of BSM
theories, and show many examples where current experimental results are not
sufficient to verify the ISM. In some cases, there is a clear roadmap for the
future experimental program, which we outline, while in other cases, further
efforts -- both theoretical and experimental -- are needed in order to robustly
claim the establishment of the ISM in the absence of new physics discoveries.Comment: 10 pages, 2 figures, 1 tabl
Current and future constraints on Higgs couplings in the nonlinear Effective Theory
We perform a Bayesian statistical analysis of the constraints on the
nonlinear Effective Theory given by the Higgs electroweak chiral Lagrangian. We
obtain bounds on the effective coefficients entering in Higgs observables at
the leading order, using all available Higgs-boson signal strengths from the
LHC runs 1 and 2. Using a prior dependence study of the solutions, we discuss
the results within the context of natural-sized Wilson coefficients. We further
study the expected sensitivities to the different Wilson coefficients at
various possible future colliders. Finally, we interpret our results in terms
of some minimal composite Higgs models.Comment: 45 pages, 9 figures, 8 tables; v2: updated references, experimental
input now includes data of Moriond 2018, extended discussion of projection to
future colliders; v3: added Appendix, matches Journal versio
Higgs Physics at future Linear Colliders - A Case for precise Vertexing
The discovery of a Higgs boson by the experiments at the LHC marks a major
breakthrough in particle physics, with far-reaching consequences for our
understanding of the fundamental principles of our Universe. To fully explore
this unique particle, experiments at high-energy electron-positron colliders
are being planned, providing substantial added benefit over the capabilities of
the LHC alone, such as model-independent measurements of couplings, constraints
on invisible decays and precise measurements of the self-coupling. This
contribution summarizes the Higgs physics program at such future facilities,
highlighting in particular also the role of precise vertexing in achieving the
ambitious goals of these experiments.Comment: 9 pages, 4 figures, to be published in the proceedings of the 22nd
International Workshop on Vertex Detectors VERTEX 2013, Lake Starnberg,
Germany, September 2013, v2 updated references. arXiv admin note: substantial
text overlap with arXiv:1211.724
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