4,728 research outputs found
Roughness of stylolites: a stress-induced instability with non local interactions
We study the roughness of stylolite surfaces (i.e. natural
pressure-dissolution surfaces in sedimentary rocks) from profiler measurements
at laboratory scales. The roughness is shown to be nicely described by a
self-affine scaling invariance. At large scales, the roughness exponent is
and very different from that at small scales where
. A cross-over length scale at around mm is
well characterized and interpreted as a possible fossil stress measurement if
related to the Asaro-Tiller-Grinfeld stress-induced instability. Measurements
are consistent with a Langevin equation that describes the growth of stylolite
surfaces in a quenched disordered material with long range elastic
correlations.Comment: 4 pages, 5 figure
Remarkable virtual SUSY effects in production at high energy hadron colliders
We present a complete 1-loop study of the electroweak corrections to the
process in MSSM and SM.
The occurrence of a number of remarkable properties in the behavior of the
helicity amplitudes at high energies is stressed, and the crucial role of the
virtual SUSY contributions in establishing them, is emphasized. The approach to
asymptopia of these amplitudes is discussed, comparing the effects of the
logarithmic and constant contributions to the mass suppressed ones, which are
relevant at lower energies. Applying crossing to , we obtain all
subprocesses needed for the 1-loop electroweak corrections to
-production at LHC. The SUSY model dependence of such a production is
then studied, and illustrations are given for the transverse momentum
distribution, as well as the angular distribution in the subprocess center of
mass.Comment: 21 pages, 12 figures, version to appear in Phys.Rev.
Specific supersimple properties of at high energy
We study the process , where represents ,
or , which occurs at the one loop level in the standard model (SM)
or in the minimal supersymmetric standard model (MSSM). We establish
supersimple (sim) high energy expressions for all helicity amplitudes of this
process, and we identify their level of accuracy for describing the various
polarized and unpolarized observables, and for distinguishing SM from MSSM or
another beyond the standard model (BSM). We pay a special attention to
transverse electron-positron polarizations and azimuthal dependencies induced
by the imaginary parts of the amplitudes, which are relatively important in
this process.Comment: 33 pages, 66 figures. Version to appear in Phys. Rev.
Higgs boson form factor effects in production by and fusion
We study the fusion processes and
observable at a future collider and we discuss their sensitivity to an
form factor which may be due to compositeness, in particular when the
and the top quark have common constituents. We make an amplitude analysis and
illustrate which helicity amplitudes and cross sections for specific final
polarizations are especially sensitive to this form factor.Comment: 24 pages, 37 figures, version including changes suggested by the
Physical Review D publication tea
A supersimple analysis of at high energy
According to supersimplicity in MSSM, a renormalization scheme (SRS) may be
defined for any high energy 2-to-2 process, to the 1loop EW order; where the
helicity conserving (HC) amplitudes, are expressed as a linear combination of
just three universal logarithm-involving forms.
All other helicity amplitudes vanish asymptotically. Including to these SRS
amplitudes the corresponding counter terms, the "supersimple" expressions for
the high energy HC amplitudes, renormalized on-shell, are obtained.
Previously, this property was noted for a large number of processes that do
not involve Yukawa interactions or renormalization group corrections. Here we
extend it to , which does involve large Yukawa and
renormalization group contributions. We show that the resulting "supersimple"
expressions may provide an accurate description, even at energies comparable to
the SUSY scale. Such descriptions clearly identify the origin of the important
SUSY effects, and they may be used for quickly constraining physics
contributions, beyond MSSM.Comment: 26 pages, 15 figures. Paper appeared in Phys. Rev. D. The Journal
where Reference 20 has appeared has been adde
The Higgs boson structure functions as signposts of new physics
We show that the Higgs boson structure functions observable in the inclusive
process may reveal the presence of anomalous
contributions corresponding to several types of new physics partners, Higgs
boson compositeness or invisible (dark) matter. This could be done without
making a difficult or even an impossible experimental analysis of the contents
of the "anything". We give illustrations showing how the shapes of the various
structure functions containing such typical new contributions may differ from
the standard prediction and allow their identification.Comment: 19 pages, 36 figures, version accepted in Phys. Rev.
Test of the triple Higgs boson form factor in
We study the sensitivity of the process to the
-dependence of the form factor, which can reflect the Higgs boson
structure, especially in the case of compositeness. We compute the Born and 1
loop SM contribution to this process. We then show how the
polarized and unpolarized cross sections are modified by the presence of
various types of anomalous contributions to the form factor, in
particular Higgs constituents in the case of compositeness.Comment: 24 pages, 22 figures, Version to appear to Physical Review D. arXiv
admin note: substantial text overlap with arXiv:1510.0410
Subleading terms in asymptotic Passarino-Veltman functions
We write explicit and self-contained asymptotic expressions for the tensorial
B, C and D Passarino-Veltman functions. These include quadratic and linear
logarithmic terms, as well as subleading constant terms. Only mass-suppressed
O(m^2/s) contributions are neglected. We discuss the usefulness of such
expressions, particularly for studying one-loop effects in 2-to-2 body
processes at high energy.Comment: 25 pages, 9 eps figure
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