144 research outputs found
Observation of Odderon Effects at LHC energies -- A Real Extended Bialas-Bzdak Model Study
The unitarily extended Bialas-Bzdak model of elastic proton-proton scattering
is applied, without modifications, to describe the differential cross-section
of elastic proton-antiproton collisions in the TeV energy range, and to
extrapolate these differential cross-sections to LHC energies. In this
model-dependent study we find that the differential cross-sections of elastic
proton-proton collision data at 2.76 and 7 TeV energies differ significantly
from the differential cross-section of elastic proton-antiproton collisions
extrapolated to these energies. The elastic proton-proton differential
cross-sections, extrapolated to 1.96 TeV energy with the help of this extended
Bialas-Bzdak model do not differ significantly from that of elastic
proton-antiproton collisions, within the theoretical errors of the
extrapolation. Taken together these results provide a model-dependent, but
statistically significant evidence for a crossing-odd component of the elastic
scattering amplitude at the at least 7.08 sigma level. From the reconstructed
Odderon and Pomeron amplitudes, we determine the dependence of the
corresponding total and differential cross-sections.Comment: Final version, typos fixed, accepted for a publication in EPJ C,
including 3 tables, 32 figures, 61 pages. Model dependent Odderon
significance stands at 7.08 sigma. Appendix C and D added to discuss the
s-dependent Pomeron and Odderon amplitudes and cross-sections and to
cross-check possible non-linear evolution of the model parameters at ISR
energie
Shape of Proton and the Pion Cloud
Proton-proton differential and total cross sections provide information on
the energy dependence of proton shape and size. We show that the deviation from
exponential behavior of the diffraction cone observed near GeV,
(so-called break), both at the ISR and the LHC follows from the -channel
two-pion loop contributions, imposed by unitarity. By using a simple Regge-pole
model, we extrapolate the "break" from the ISR energy region to that of the
LHC. This allows us to answer two important questions: 1) To what extent is the
"break" observed recently at the LHC a "recurrence" of that seen at the ISR
(universality)? 2) What is the relative weight of two-pion effect to the vertex
coupling (Regge residue) compared to expanding size (pomeron propagator) in
producing the "break"? We find that the effect comes both from the Regge
residue (proton-pomeron coupling) and from the Regge propagator. A detail
analyses of their balance, including the correlation between the relevant
parameters is presented.Comment: 9 pages, 7 figures, 3 table
Evidence of Odderon-exchange from scaling properties of elastic scattering at TeV energies
We study the scaling properties of the differential cross section of elastic
proton-proton () and proton-antiproton () collisions at high
energies. We introduce a new scaling function, that scales -- within the
experimental errors -- all the ISR data on elastic scattering from
to GeV to the same universal curve. We explore the
scaling properties of the differential cross-sections of the elastic and
collisions in a limited TeV energy range. Rescaling the TOTEM
data from TeV to and TeV, and comparing it to D0
data at TeV, our results provide an evidence for a -channel
Odderon exchange at TeV energies, with a significance of at least 6.26.
We complete this work with a model-dependent evaluation of the domain of
validity of the new scaling and its violations. We find that the scaling
is valid, model dependently, within GeV TeV,
with a range gradually narrowing with decreasing colliding energies.Comment: Accepted in EPJ C, with typos fixed, reorganized institutions
updated, Appendix A, B, C, D, E added, 60 pages, 29 figures, 13 tables,
Odderon significance: 6.26 sigma, conclusions unchange
The ReBB model and its scaling version at 8 TeV
The Real Extended Bialas-Bzdak (ReBB) model is shown here to describe, in the
0.37 1.2 GeV region, the proton-proton elastic differential
cross section data published by the TOTEM Collaboration at LHC at
8 TeV colliding energy. In this kinematic range, corresponding to the
diffractive minimum-maximum region, a model-dependent Odderon signal higher
than 18 is obtained by comparing the ReBB model prediction for the
elastic differential cross section to this TOTEM measured
elastic differential cross section data at 8 TeV. However, when combining this
signal with the Odderon signals from the ReBB model in the 0.37
1.2 GeV four-momentum-transfer range at 1.96, 2.76 and 7 TeV,
it turns out that the combined significance is dominated not by the new 8 TeV
but by that of earlier 7 TeV TOTEM data, that carry an even larger Odderon
effect. Thus, in any practical terms, within the framework of the ReBB model,
the Odderon signal in the limited 0.37 1.2 GeV and 1.96
8 TeV kinematic region is not a probability, but a
certainty. We show also that the version of the ReBB model works
reasonably well at 8 TeV in the 0.37 0.97 GeV region.Comment: 8 pages, 3 figures, 2 table
Proton Holography -- Discovering Odderon from Scaling Properties of Elastic Scattering
We investigate the scaling properties of elastic scattering data at ISR and
LHC energies and find that the significance of an Odderon observation is larger
than the discovery threshold of 5. As an unexpected by-product of these
investigations, for certain experimentally relevant cases, we also conjecture
the possibility of proton holography with the help of elastic proton-proton
scattering.Comment: 10 pages in one-column (better readable) form, 2 figures, invited
theory talk of T. Csorgo at the ISMD 2019 conference in Santa Fe, NM, USA,
final version, to appear in EPJ Web of Conferences (in two-column format
Curvature of the diffraction cone of proton-proton elastic scattering at high energies in maximal Pomeron and Odderon model
The values of the slope B(s,t) and curvature parameter C(s,t) have been calculated within the framework of the maximal Pomeron and Odderon approach in the wide s- and low t-range with the allowance made for the diffraction cone shape. The absolute values of the averaged curvature parameter is predicted to be decreasing depending on s and change of sign at asymptotically large energies far from achievable ones.Нахил B(s,t) та параметр кривизни C(s,t) розраховані у рамках моделі максимального Померона та Оддерона у широкому діапазоні s і при малих t з урахуванням форми дифракційного конуса. Передбачається, що абсолютне значення усередненого параметра кривизни спадає залежно від s і змінює знак при асимптотично високих енергіях, далеких від досяжних
Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin)
TheNógrád-GömörVolcanic Field (NGVF) is one of the five mantle xenolith bearing
alkaline basalt locations in the Carpathian Pannonian Region. This allows us to constrain
the structure and properties (e.g. composition, current deformation state, seismic anisotropy,
electrical conductivity) of the upper mantle, including the lithosphere-asthenosphere boundary
(LAB) using not only geophysical, but also petrologic and geochemical methods. For
this pilot study, eight upper mantle xenoliths have been chosen from Bárna-Nagyk˝o, the
southernmost location of the NGVF. The aim of this study is estimating the average seismic
properties of the underlying mantle. Based on these estimations, the thickness of the
anisotropic layer causing the observed average SKS delay time in the area was modelled
considering five lineation and foliation end-member orientations. We conclude that a 142–
333km thick layer is required to explain the observed SKS anisotropy, assuming seismic
properties calculated by averaging the properties of the eight xenoliths. It is larger than the
thickness of the lithospheric mantle. Therefore, the majority of the delay time accumulates
in the sublithospheric mantle. However, it is still in question whether a single anisotropic
layer, represented by the studied xenoliths, is responsible for the observed SKS anisotropy,as it is assumed beneath the Bakony–Balaton Highland Volcanic Field (Kovács et al. 2012),
or the sublithospheric mantle has different layers. In addition, the depths of the Moho and
the LAB (25 ± 5, 65 ± 10 km, respectively) were estimated based on S receiver function
analyses of data from three nearby permanent seismological stations
Catches of Euxoa tritici in pheromone traps for Anarsia lineatella are due to the presence of (Z)-5-decenyl acetate as an impurity
Traps baited with the synthetic pheromone of Anarsia lineatella Zeller (Lepidoptera: Gelechiidae) frequently captured also Euxoa tritici L. males (Lepidoptera: Noctuidae) in field tests in Hungary. As (E)-monounsaturated compounds are uncommon among sex attractants or pheromone components of Noctuidae, it was hypothesized that the Euxoa catches may have been due to impurities of the (Z) isomer in synthetic (E)-5-decenyl acetate, which is the major component in the pheromone lure of A. lineatella. Traps baited with synthetic (Z)-5-decenyl acetate captured large numbers of E. tritici, and the compound showed a clear dose–response effect. Reanalysis of the synthetic batch of (E)-5-decenyl acetate used in preparation of the A. lineatella lure showed the presence of 10% of the (Z) isomer. Traps baited with synthetic (Z)-5-decenyl acetate can be used in the future for detection and monitoring purposes of E. tritici, a widely distributed pest of cereals and other field crops. The compound also showed attraction of Euxoa seliginis Duponche
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