2,436 research outputs found
Large Squark-Mixing Impact on H^+ Decay in the MSSM
We study the decays of the charged Higgs boson H^+ within the Minimal
Supersymmetric Standard Model. We find that the supersymetric mode 'stop +
sbottom-bar' can dominate the H^+ decays in a wide range of the model
parameters due to the large Yukawa couplings and mixings of stop and sbottom.
Compared to the conventional modes 'tau^+ nu' and 't b-bar', this mode has very
distinctive signatures. This could have a decisive impact on H^+ searches at
future colliders. We find also that the QCD corrections to the 'stop +
sbottom-bar' mode are significant, but that they do not invalidate our
tree-level conclusion above.Comment: 4 pages, latex, 1 eps figure, uses stwol.sty; Invited talk at the
28th International Conference on High Energy Physics, Warsaw, Poland, 25-31
July 1996 (to appear in the proceedings (World Scientific)
Impact of bosonic decays on the search for t~_1 and b~_1 squarks
We perform a detailed study of the decays of the lighter top and bottom
squarks (t~_1 and b~_1) in the Minimal Supersymmetric Standard Model (MSSM). We
show that the decays into Higgs or gauge bosons, i.e. t~_1 -> b~_1 + (H^+ or
W^+) and b~_1 -> t~_1 + (H^- or W^-), can be dominant in a wide range of the
MSSM parameters due to the large Yukawa couplings and mixings of t~ and b~.
Compared to the decays into fermions, such as t~_1 -> t + (neutralino_i or
gluino) and t~_1 -> b + chargino_j, these bosonic decay modes can have
significantly different decay distributions. We also show that the effect of
the supersymmetric QCD running of the quark and squark parameters on the t~_1
and b~_1 decay branching ratios is quite dramatic. These could have an
important impact on the search for t~_1 and b~_1 and the determination of the
MSSM parameters at future colliders.Comment: 14 pages, 4 figures, LaTeX2
Correlation between the decays in the MSSM with quark flavour violation
We study the loop-induced decays and in the Minimal Supersymmetric Standard Model (MSSM) with quark flavour
violation (QFV), identifying with the Higgs boson with a mass of 125 GeV,
where and are photon and gluon, respectively. We perform a MSSM
parameter scan and a detailed analysis around a fixed reference point
respecting theoretical constraints from vacuum stability conditions and
experimental constraints, such as those from B meson data and electroweak
precision data, as well as recent limits on supersymmetric (SUSY) particle
masses from LHC experiments. We find that (i) the relative deviation of the
decay width from the Standard Model value, ,
can be large and negative, , (ii) the analogous deviation of
is strongly correlated, for , (iii) the relative deviation of the
width ratio from the
SM value, , can be large (up to 20\%), (iv) the
deviations can be large due to the up-type squark loop contributions, (v) the
SUSY QFV parameters can have a significant effect on these deviations. Such
large deviations can be observed at a future collider like ILC.
Observation of the deviation patterns as shown in this study would favour the
MSSM with flavour-violating squark mixings and encourage to perform further
studies in this model.Comment: Version accepted for publication in IJMP
Impact of SUSY CP Phases on Stop and Sbottom Decays in the MSSM
We study the decays of top squarks and bottom squarks in the Minimal
Supersymmetric Standard Model with complex parameters A_t, A_b and mu. In a
large region of the supersymmetric parameter space the branching ratios of
stop_1 and sbottom_1 show a pronounced phase dependence. This could have an
important impact on the search for stop_1 and sbottom_1 at a future linear
collider and on the determination of the supersymmetric parameters.Comment: 10 pages, LaTeX, 4 eps figures; contribution to the Extended Joint
ECFA/DESY Study on Physics and Detectors for a Linear Electron-Positron
Collider; v2: parameter space excluded by B(b -> s gamma) correcte
Higgs boson decay to charm pair at full one-loop level in the MSSM with flavour violation
We study the decay of the lightest neutral Higgs boson to a charm quark pair
at full one-loop level in the MSSM with non-minimal quark flavour violation
(QFV). In the numerical analysis we consider mixing between the second and the
third squark generation and all relevant constraints from B meson data are
taken into account. It is shown that the full one-loop corrected decay width
can be quite sensitive to the MSSM QFV parameters due to large mixing and large trilinear couplings. After summarising the
theoretical and experimental errors, we conclude that an observation of these
SUSY QFV effects is possible at the ILC.Comment: 9 papes, 2 figures, talk presented at the International Workshop on
Future Linear Colliders (LCWS14), Belgrade, Serbia, 6-10 October 201
The decays and in the light of the MSSM with quark flavour violation
We calculate the decay width of h0 -> b bbar in the Minimal Supersymmetric
Standard Model (MSSM) with quark flavour violation (QFV) at full one-loop
level. We study the effect of scharm-stop mixing and sstrange-sbottom mixing
taking into account the constraints from the B meson data. We discuss and
compare in detail the decays h0 -> c cbar and h0 -> b bbar within the framework
of the perturbative mass insertion technique using the Flavour Expansion
Theorem. The deviation of both decay widths from the Standard Model values can
be quite large. Whereas in h0 -> c cbar it is almost entirely due to the
flavour violating part of the MSSM, in h0 -> b bbar it is mainly due to the
flavour conserving part. Nevertheless, the QFV contribution to Gamma(h0 -> b
bbar) due to scharm-stop mixing and chargino exchange can go up to about 8%.Comment: Minor changes, version published in JHE
Improved SUSY QCD corrections to Higgs boson decays into quarks and squarks
We improve the calculation of the supersymmetric QCD
corrections to the decays of Higgs bosons into quarks and squarks in the
Minimal Supersymmetric Standard Model. In the on-shell renormalization scheme
these corrections can be very large, which makes the perturbative expansion
unreliable. This is especially serious for decays into bottom quarks and
squarks for large . Their corrected widths can even become negative.
We show that this problem can be solved by a careful choice of the tree-level
Higgs boson couplings to quarks and squarks, in terms of the QCD and SUSY QCD
running quark masses, running trilinear couplings , and on-shell
left-right mixing angles of squarks. We also present numerical results for the
corrected partial decay widths for the large case.Comment: Version to be published in PR
Impact of CP phases on the search for top and bottom squarks
We study the decays of top squarks (~t_{1,2}) and bottom squarks (~b_{1,2})
in the Minimal Supersymmetric Standard Model (MSSM) with complex parameters
A_t, A_b, mu and M_1. We show that including the corresponding phases strongly
affects the branching ratios of ~t_{1,2} and ~b_{1,2} decays in a large domain
of the MSSM parameter space. This could have an important impact on the search
for ~t_{1,2} and ~b_{1,2} and the determination of the underlying MSSM
parameters at future colliders.Comment: 6 pages, 1 figure, Invited talk presented by K. Hidaka in The 12th
International Conference on Supersymmetry and Unification of Fundamental
Interactions (SUSY04), June 17-23, 2004, Tsukuba, Japa
Impact of quark flavor violation on the decay in the MSSM
We compute the decay width of in the MSSM with quark
flavor violation (QFV) at full one-loop level in the
renormalization scheme. We study the effects of mixing,
taking into account the constraints on QFV from the B meson data. We find that
the full one-loop corrected decay width is very
sensitive to the MSSM QFV parameters. In a scenario with large
mixing, can
differ up to from its SM value. After estimating the
uncertainties of the width, we conclude that an observation of these QFV SUSY
effects is possible at a future collider such as ILC.Comment: 4 pages, 2 figures, Proceedings of International Workshop on Higgs as
a Probe of New Physics 2015 (HPNP2015), Toyama, Japan, 11-15, February, 2015
(to be published in eConf
Design of Quantum Annealing Machine for Prime Factoring
We propose a prime factoring machine operated in a frame work of quantum
annealing (QA). The idea is inverse operation of a quantum-mechanically
reversible multiplier implemented with QA-based Boolean logic circuits. We
designed the QA machine on an application-specific-annealing-computing
architecture which efficiently increases available hardware budgets at the cost
of restricted functionality. The circuits are to be implemented and fabricated
by using superconducting integrated circuit technology. We propose a
three-dimensional packaging scheme of a qubit-chip / interposer /
package-substrate structure for realizing practically-large scale QA systems.Comment: 3 pages, 6 figures, to appear in IEEE Xplore Conference Proceedings
of the 16th International Superconductive Electronics Conference (ISEC 2017
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