527 research outputs found
Probing triple-Higgs productions via decay channel at a 100 TeV hadron collider
The quartic self-coupling of the Standard Model Higgs boson can only be
measured by observing the triple-Higgs production process, but it is
challenging for the Large Hadron Collider (LHC) Run 2 or International Linear
Collider (ILC) at a few TeV because of its extremely small production rate. In
this paper, we present a detailed Monte Carlo simulation study of the
triple-Higgs production through gluon fusion at a 100 TeV hadron collider and
explore the feasibility of observing this production mode. We focus on the
decay channel , investigating
detector effects and optimizing the kinematic cuts to discriminate the signal
from the backgrounds. Our study shows that, in order to observe the Standard
Model triple-Higgs signal, the integrated luminosity of a 100 TeV hadron
collider should be greater than ab. We also explore the
dependence of the cross section upon the trilinear () and quartic
() self-couplings of the Higgs. We find that, through a search in
the triple-Higgs production, the parameters and can be
restricted to the ranges and , respectively. We also
examine how new physics can change the production rate of triple-Higgs events.
For example, in the singlet extension of the Standard Model, we find that the
triple-Higgs production rate can be increased by a factor of .Comment: 33 pages, 11 figures, added references, corrected typos, improved
text, affiliation is changed. This is the publication versio
Tuning Pythia8 for future colliders
The majority of Monte-Carlo (MC) simulation campaigns for future
colliders has so far been based on the leading-order (LO) matrix elements
provided by Whizard 1.95, followed by parton shower and hadronization in
Pythia6, using the tune of the OPAL experiment at LEP. In this contribution, we
test and develop the interface between Whizard3 and Pythia8. As a first step,
we simulate the process with LO matrix elements, and
compare three tunes in Pythia8: the standard Pythia8 tune, the OPAL tune and
the ALEPH tune. At stable-hadron level, predictions of charged and neutral
hadron multiplicities of these tunes are compared to LEP data, since they are
strongly relevant to the performance of particle flow algorithms.
The events are used to perform a full detector simulation and reconstruction
of the International Large Detector concept (ILD) as an example for a
particle-flow-optimised detector. At reconstruction level, a comparison of the
jet energy resolution in these tunes is presented. We found good agreement with
previous results that were simulated by Whizard1+Pythia6. In addition, the
preliminary next-to-leading order (NLO) results are also presented. This modern
MC simulation chain, with matched NLO matrix elements in the future, should be
introduced to ILC or other future colliders.Comment: 8 pages, 7 figures, 1 table, LCWS 202
Sharp estimates and non-degeneracy of low energy nodal solutions for the Lane-Emden equation in dimension two
We study the Lane-Emden problem where is a smooth bounded domain and
is sufficiently large. We obtain sharp estimates and non-degeneracy of
low energy nodal solutions (i.e. nodal solutions satisfying
). As applications, we
prove that the comparable condition
holds automatically for least
energy nodal solutions, which confirms a conjecture raised by
(Grossi-Grumiau-Pacella, Ann.I.H. Poincare-AN, 30 (2013), 121-140) and
(Grossi-Grumiau-Pacella, J.Math.Pures Appl. 101 (2014), 735-754)
Constraining rare B decays by at future lepton colliders
Motivated by the recent rare B decays measurements, we study the matching
procedure of operators in the low energy effective Hamiltonian
and operators in the Standard Model effective theory (SMEFT). It is noticed
that there are more related operators in the SMEFT whose coefficients can not
be determined only from the low-energy data from B physics. We demonstrate how
to determine these coefficients with some new physics models, like
model and leptoquark models, and then consider how to probe these operators of
SMEFT at high energy by using the process at future muon
colliders, which can provide complementary information except for on the underlying models which lead to rare B decay processes. We
perform a Monte Carlo study (a hadron level analysis) to show how to separate
the signal events from the SM background events and estimate the sensitivity to
the Wilson coefficients for different models.Comment: 29 pages, 8 figures, 3 tables, added references, publication versio
An equivalent-effect phenomenon in eddy current non-destructive testing of thin structures
The inductance/impedance due to thin metallic structures in non-destructive
testing (NDT) is difficult to evaluate. In particular, in Finite Element Method
(FEM) eddy current simulation, an extremely fine mesh is required to accurately
simulate skin effects especially at high frequencies, and this could cause an
extremely large total mesh for the whole problem, i.e. including, for example,
other surrounding structures and excitation sources like coils. Consequently,
intensive computation requirements are needed. In this paper, an
equivalent-effect phenomenon is found, which has revealed that alternative
structures can produce the same effect on the sensor response, i.e. mutual
impedance/inductance of coupled coils if a relationship (reciprocal
relationship) between the electrical conductivity and the thickness of the
structure is observed. By using this relationship, the mutual
inductance/impedance can be calculated from the equivalent structures with much
fewer mesh elements, which can significantly save the computation time. In eddy
current NDT, coils inductance/impedance is normally used as a critical
parameter for various industrial applications, such as flaw detection, coating
and microstructure sensing. Theoretical derivation, measurements and
simulations have been presented to verify the feasibility of the proposed
phenomenon
Studying the Impact of Filling Information Gaps on the Output Quality of Neural Data-to-Text
Acknowledgments We would like to thank our reviewers for their insightful feedback and questions. The work presented here is partially funded by the Engineering and Physical Sciences Research Council (EPSRC), which funds Craig Thomson under a National Productivity Investment Fund Doctoral Studentship (EP/R512412/1).Peer reviewedPublisher PD
Prospects of gravitational waves in the minimal left-right symmetric model
The left-right symmetric model (LRSM) is a well-motivated framework to
restore parity and implement seesaw mechanisms for the tiny neutrino masses at
or above the TeV-scale, and has a very rich phenomenology at both the
high-energy and high-precision frontiers. In this paper we examine the phase
transition and resultant gravitational waves (GWs) in the minimal version of
LRSM. Taking into account all the theoretical and experimental constraints on
LRSM, we identify the parameter regions with strong first-order phase
transition and detectable GWs in the future experiments. It turns out in a
sizeable region of the parameter space, GWs can be generated in the phase
transition with the strength of to at the frequency of
0.1 to 10 Hz, which can be detected by BBO and DECIGO. Furthermore, GWs in the
LRSM favor a relatively light -breaking scalar , which is
largely complementary to the direct searches of a long-lived neutral scalar at
the high-energy colliders. It is found that the other heavy scalars and the
right-handed neutrinos in the LRSM also play an important part for GW signal
production in the phase transition.Comment: 41 pages, 10 figures, 5 tables, added references, improved tex
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