443 research outputs found
Evidence of a p- bound state
The existence of a nucleon- (N-) bound state has been subject of
theoretical and experimental investigations for decades. In this letter a
re-analysis of the p- correlation measured at the LHC is presented, using
as input recent lattice calculations of the N- interaction in the spin
3/2 channel obtained by the HAL QCD collaboration. A constrained fit of the
experimental data allows to determine the spin 1/2 channel of the p-
interaction with evidence of the formation of a p- bound state. The
scattering length and effective range extracted from the spin 1/2 channel are
fm and
fm, respectively. The corresponding binding energy is estimated to be in the
range MeV. This is the first experimental evidence of a p-
bound state
Search for deeply bound kaonic nuclear states in the AMADEUS experiment
We briefly report on the search for Deeply Bound Kaonic Nuclear States with AMADEUS in the Σ0p channel, and future perspectives
Strongest atomic physics bounds on Non-Commutative Quantum Gravity Models
Investigations of possible violations of the Pauli Exclusion Principle
represent critical tests of the microscopic space-time structure and
properties. Space-time non-commutativity provides a class of universality for
several Quantum Gravity models. In this context the VIP-2 Lead experiment sets
the strongest bounds, searching for Pauli Exclusion Principle violating
atomic-transitions in lead, excluding the -Poincar\'e Non Commutative
Quantum Gravity models far above the Planck scale for non-vanishing
``electric-like'' components, and up to
Planck scales if .Comment: 7 pages, 2 figure
Experimental test of Non-Commutative Quantum Gravity by VIP-2 Lead
Pauli Exclusion Principle (PEP) violations induced by space-time
non-commutativity, a class of universality for several models of Quantum
Gravity, are investigated by the VIP-2 Lead experiment at the Gran Sasso
underground National Laboratory of INFN. The VIP-2 Lead experimental bound on
the non-commutative space-time scale excludes -Poincar\'e far
above the Planck scale for non vanishing ``electric-like" components of
, and up to Planck scales if they are
null. Therefore, this new bound represents the tightest one so far provided by
atomic transitions tests. This result strongly motivates high sensitivity
underground X-ray measurements as critical tests of Quantum Gravity and of the
very microscopic space-time structure.Comment: 13 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:2209.0007
VIP-2 —High-Sensitivity Tests on the Pauli Exclusion Principle for Electrons
The VIP collaboration is performing high sensitivity tests of the Pauli Exclusion Principle for electrons in the extremely low cosmic background environment of the underground Gran Sasso National Laboratory INFN (Italy). In particular, the VIP-2 Open Systems experiment was conceived to put strong constraints on those Pauli Exclusion Principle violation models which respect the so-called Messiah–Greenberg superselection rule. The experimental technique consists of introducing a direct current in a copper conductor, and searching for the X-rays emission coming from a forbidden atomic transition from the L shell to the K shell of copper when the K shell is already occupied by two electrons. The analysis of the first three months of collected data (in 2018) is presented. The obtained result represents the best bound on the Pauli Exclusion Principle violation probability which fulfills the Messiah–Greenberg rule
HIGH SENSITIVITY QUANTUM MECHANICS TESTS IN THE COSMIC SILENCE
The VIP experiment aims to perform high-precision tests of the Pauli Exclusion Principle for electrons in the extremely low cosmic background environment of the Underground Gran Sasso Laboratories of INFN (Italy).
The experimental technique consists in introducing a DC current in a copper conductor, searching for K α PEP-forbidden atomic transitions when the K shell is already occupied by two electrons. The results of a preliminary data analysis, corresponding to the first run of the VIP-2 data taking (2016–2017), are presented. The experimental setup in the final configuration is described together with preliminary spectra from the 2019 data-taking campaign
High Precision Test of the Pauli Exclusion Principle for Electrons
The VIP-2 experiment aims to perform high precision tests of the Pauli Exclusion Principle for electrons. The method consists in circulating a continuous current in a copper strip, searching for the X radiation emission due to a prohibited transition (from the 2p level to the 1s level of copper when this is already occupied by two electrons). VIP already set the best limit on the PEP violation probability for electrons , the goal of the upgraded VIP-2 (VIolation of the Pauli Exclusion Principle-2) experiment is to improve this result of two orders of magnitude at least. The experimental apparatus and the results of the analysis of a first set of collected data will be presented
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