294 research outputs found
Distributionally robust stability of payoff allocations in stochastic coalitional games
We consider multi-agent coalitional games with uncertainty in the coalitional
values. We provide a novel methodology to study the stability of the grand
coalition in the case where each coalition constructs ambiguity sets for the
(possibly) unknown probability distribution of the uncertainty. As a less
conservative solution concept compared to worst-case approaches for coalitional
stability, we consider a stochastic version of the so-called core set, i.e.,
the expected value core. Unfortunately, without exact knowledge of the
probability distribution, the evaluation of the expected value core is an
extremely challenging task. Hence, we propose the concept of distributionaly
robust (DR) core. Leveraging tools from data-driven DR optimization under the
Wasserstein distance, we provide finite-sample guarantees that any allocation
which lies in the DR core is also stable with respect to the true probability
distribution. Furthermore, we show that as the number of samples grows
unbounded, the DR core converges almost surely to the true expected value core.
We dedicate the last section to the computational tractability of finding an
allocation in the DR core.Comment: Accepted for publication at the IEEE Conference on Decision and
Control 202
A relaxed-inertial forward-backward-forward algorithm for Stochastic Generalized Nash equilibrium seeking
In this paper we propose a new operator splitting algorithm for distributed
Nash equilibrium seeking under stochastic uncertainty, featuring relaxation and
inertial effects. Our work is inspired by recent deterministic operator
splitting methods, designed for solving structured monotone inclusion problems.
The algorithm is derived from a forward-backward-forward scheme for solving
structured monotone inclusion problems featuring a Lipschitz continuous and
monotone game operator. To the best of our knowledge, this is the first
distributed (generalized) Nash equilibrium seeking algorithm featuring
acceleration techniques in stochastic Nash games without assuming cocoercivity.
Numerical examples illustrate the effect of inertia and relaxation on the
performance of our proposed algorithm
Prenatal diagnosis and post-mortem examination in a fetus with thrombocytopenia-absent radius (TAR) syndrome due to compound heterozygosity for a 1q21.1 microdeletion and a RBM8A hypomorphic allele: a case report
Background: Thrombocytopenia-absent radius syndrome is a rare autosomal recessive disorder characterized by megakaryocytic thrombocytopenia and longitudinal limb deficiencies mostly affecting the radial ray. Most patients are compound heterozygotes for a 200 kb interstitial microdeletion in 1q21.1 and a hypomorphic allele in RBM8A, mapping in the deleted segment. At the moment, the complete molecular characterization of thrombocytopenia-absent radius syndrome is limited to a handful of patients mostly ascertained in the pediatric age. Case presentation. We report on a fetus with bilateral upper limb deficiency found at standard prenatal ultrasound examination. The fetus had bilateral radial agenesis and humeral hypo/aplasia with intact thumbs, micrognathia and urinary anomalies, indicating thrombocytopenia-absent radius syndrome. Molecular studies demonstrated compound heterozygosity for the 1q21.1 microdeletion and the RBM8A rs139428292 variant at the hemizygous state, inherited from the mother and father, respectively. Conclusion: The molecular information allowed prenatal diagnosis in the following pregnancy resulting in the birth of a healthy carrier female. A review was carried out with the attempt to the trace the fetal ultrasound presentation of thrombocytopenia-absent radius syndrome and discussing opportunities for second-tier molecular studies within a multidisciplinary setting. © 2013 Bottillo et al.; licensee BioMed Central Ltd
Multidifferential study of identified charged hadron distributions in -tagged jets in proton-proton collisions at 13 TeV
Jet fragmentation functions are measured for the first time in proton-proton
collisions for charged pions, kaons, and protons within jets recoiling against
a boson. The charged-hadron distributions are studied longitudinally and
transversely to the jet direction for jets with transverse momentum 20 GeV and in the pseudorapidity range . The
data sample was collected with the LHCb experiment at a center-of-mass energy
of 13 TeV, corresponding to an integrated luminosity of 1.64 fb. Triple
differential distributions as a function of the hadron longitudinal momentum
fraction, hadron transverse momentum, and jet transverse momentum are also
measured for the first time. This helps constrain transverse-momentum-dependent
fragmentation functions. Differences in the shapes and magnitudes of the
measured distributions for the different hadron species provide insights into
the hadronization process for jets predominantly initiated by light quarks.Comment: All figures and tables, along with machine-readable versions and any
supplementary material and additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-013.html (LHCb
public pages
Study of the decay
The decay is studied
in proton-proton collisions at a center-of-mass energy of TeV
using data corresponding to an integrated luminosity of 5
collected by the LHCb experiment. In the system, the
state observed at the BaBar and Belle experiments is
resolved into two narrower states, and ,
whose masses and widths are measured to be where the first uncertainties are statistical and the second
systematic. The results are consistent with a previous LHCb measurement using a
prompt sample. Evidence of a new
state is found with a local significance of , whose mass and width
are measured to be and , respectively. In addition, evidence of a new decay mode
is found with a significance of
. The relative branching fraction of with respect to the
decay is measured to be , where the first
uncertainty is statistical, the second systematic and the third originates from
the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb
public pages
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