196 research outputs found
Heavy Quarkonia sector in PYTHIA 6.324: tuning, validation and perspectives at LHC(b)
In this note we investigate the impact of the recent insertion of Color Octet Model processes in PYTHIA version 6.324, through a tuning of different PYTHIA parameters, including the low-p behaviour. The Non-relativistic QCD parameters have been chosen according to the most recent theoretical calculations and fits to CDF data. This analysis has been mainly focused on J/ and prompt production, with a comparison of the Monte Carlo predictions with available data from CDF at Run I and Run II energies. A prediction at the LHC energy, within different acceptance regions (CMS-Atlas and LHCb ones), is also given
Guidelines for public administrations on location privacy
Public administrations increasingly use location data to deliver public services, including location-enabled tools, apps for tourists, toll collection services and cadastral web applications.
Location data, such as addresses, GPS coordinates or camera images, is key to many public services and can also be linked to all sorts of other data, generating new information that was not available before. Despite the increased consumption of location data, its potential to reveal personal information is often underestimated, especially in comparison to other sensitive data, for instance in the financial and health domains.
Location data not only say where an individual is, but it also says who he/she is and what his/her interests and preferences are. Therefore, location data privacy is of paramount importance for public administrations dealing with location data. While location data privacy has many aspects in common with general data protection principles, it also has unique characteristics that require specific consideration.
The goal of this guidance document is therefore twofold: to outline the key obligations that public administrations should comply with when handling personal location data and raising awareness about the importance of location data privacy, highlighting key implications and risks associated with the processing of location data. It does so by guiding the reader through concrete scenarios that public administrations might face when processing personal location data and provides a set of effective and practical recommendations that can help ensure the adequate protection of personal location data.
The guidance has been updated following the introduction of GDPR, taking into account market research in the location industry of the impact of GDPR. The updated document includes new models and concepts as well as using examples throughout to illustrate changes and potential approaches. It is a guide to practitioners and while touching on the key relevant parts of GDPR, it is not a legal document or legal advice.JRC.B.6-Digital Econom
Phenomenological Constraints on Extended Quark Sectors
We study the flavor physics in two extensions of the quark sector of the
Standard Model (SM): a four generation model and a model with a single
vector--like down--type quark (VDQ). In our analysis we take into account the
experimental constraints from tree--level charged current processes, rare Kaon
decay processes, rare B decay processes, the decay, ,
and mass differences, and the CP violating parameters \frac
\epsilon^\prime}{\epsilon}, and . All the constraints
are taken at two sigma. We find bounds on parameters which can be used to
represent the New Physics contributions in these models (, and in the
four--generation model, and , and in the VDQ model)
due to all the above constraints. In both models the predicted ranges for
(the CP asymmetry in semi-leptonic decays), ,
, and can be significantly higher than the predictions of the
SM, while the allowed ranges for and for are
consistent with the SM prediction.Comment: 22 pages, 5 figures (v3: added a reference, updated a reference,
added missing units
Complex flavour couplings in supersymmetry and unexpected CP-violation in the decay B -> phi K
Complex flavour couplings (off-diagonal mass terms) in the squark sector of
supersymmetric theories may drastically alter both the rate and the
CP-violating asymmetry of certain B-meson decays. We consider the effects of
couplings that induce b -> s transitions and lead to final state with
strangeness one. We investigate the bounds that must be satisfied by the new
terms and explore the possible implications on direct and mixing induced
asymmetries in the charged and neutral B -> J/Psi K and B -> phi K decays.Comment: 14 pages, 3 figure
Developments in Rare Kaon Decay Physics
We review the current status of the field of rare kaon decays. The study of
rare kaon decays has played a key role in the development of the standard
model, and the field continues to have significant impact. The two areas of
greatest import are the search for physics beyond the standard model and the
determination of fundamental standard-model parameters. Due to the exquisite
sensitivity of rare kaon decay experiments, searches for new physics can probe
very high mass scales. Studies of the k->pnn modes in particular, where the
first event has recently been seen, will permit tests of the standard-model
picture of quark mixing and CP violation.Comment: One major revision to the text is the branching ratio of KL->ppg,
based on a new result from KTeV. Several references were updated, with minor
modifications to the text. A total of 48 pages, with 28 figures, in LaTeX; to
be published in the Annual Review of Nuclear and Particle Science, Vol. 50,
December 200
Extraction of the KK-bar isovector scattering length from pp -> d K^+ K-bar^0 data near threshold
The results of a recent experiment measuring the reaction pp -> dK^+ \bar K^0
near threshold are interpreted in terms of a spectator model that encapsulates
the main features of the observed K^+ \bar K^0 invariant mass distribution. A
chi^2 fit to this data leads to an imaginary part of the isovector scattering
length in the K \bar K channel of Im(a_1) = -(0.63 \pm 0.24) fm. We then use
the Flatte representation of the scattering amplitude to infer a value Re(a_1)
= -(0.02 \pm 0.02) fm for the real part under the assumption that scaling is
approximately satisfied. We show further that it is not possible to exclude the
effects of \pi^+\eta to K^+ \bar K^0 channel coupling within the context of our
model.Comment: 10 pages, 2 figures, 1 tabl
The CKM Matrix and The Unitarity Triangle: Another Look
The unitarity triangle can be determined by means of two measurements of its
sides or angles. Assuming the same relative errors on the angles
and the sides , we find that the pairs
and are most efficient in determining
that describe the apex of the unitarity triangle. They
are followed by , , ,
and . As the set \vus, \vcb, and appears to be
the best candidate for the fundamental set of flavour violating parameters in
the coming years, we show various constraints on the CKM matrix in the
plane. Using the best available input we determine the universal
unitarity triangle for models with minimal flavour violation (MFV) and compare
it with the one in the Standard Model. We present allowed ranges for , , , , and within the
Standard Model and MFV models. We also update the allowed range for the
function that parametrizes various MFV-models.Comment: "published version. few typos corrected, results unchanged
Positive Parity Scalar Mesons in the 1-2 GeV Mass Range
Based on the observation that K_0(1430) is lighter than its SU_3 counterpart,
a_0(1450), we examine the possibility that these particles, together with
f_0(1370), f_0(1500) and f_0(1710), fill a tetraquark recurrence of the sub-GeV
0^{++} nonet mixed with a glueball state. We find the picture to be consistent
with the known data about the three f_0 resonances, more than the q-qbar
hypothesis. Conventional spin-orbit coupling suggests the q-qbar, P-wave, nonet
to lie around 1200 MeV. We review possible experimental indications of a scalar
isovector resonance at 1.29 GeV, first observed by OBELIX in p-pbar
annihilation.Comment: 12 pages, 9 figures. Extended version. References added. Results and
conclusions unchange
The antinucleon-nucleon interaction at low energy : annihilation dynamics
The general properties of antiproton-proton annihilation at rest are
presented, with special focus on the two-meson final states. The data exhibit
remarkable dynamical selection rules : some allowed annihilation modes are
suppressed by one order of magnitude with respect to modes of comparable
phase-space. Various phenomenological analyses are reviewed, based on
microscopic quark dynamics or symmetry considerations. The role of initial- and
final-state interaction is also examined.Comment: 128 pages, 49 tables, 27 figure
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