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Search Results: 1 - 10 of 47357 matches for " Jean-Marc Richard "
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About the stability of the dodecatoplet
Richard, Jean-Marc
High Energy Physics - Phenomenology , 2008, DOI: 10.1007/s00601-009-0017-8
Abstract: A new investigation is done of the possibility of binding the "dodecatoplet", a system of six top quarks and six top antiquarks, using the Yukawa potential mediated by Higgs exchange. A simple variational method gives a upper bound close to that recently estimated in a mean-field calculation. It is supplemented by a lower bound provided by identities among the Hamiltonians describing the system and its subsystems.
Remarks about spin measurements in $\bar{\rm p}{\rm p} \to \overlineΛΛ$
Jean-Marc Richard
Physics , 1996, DOI: 10.1016/0370-2693(95)01598-1
Abstract: We comment on the proposed measurement of the spin-depolarisation parameter $D_{nn}$ in the strangeness-exchange reaction $\bar{\rm p}{\rm p} \rightarrow \overline{\Lambda}{\Lambda}$. It is shown that the existing data on the correlation coefficients $C_{ij}$ limit the range allowed for $D_{nn}$.
The domain of stability of unnatural parity states of three unit charges
Jean-Marc Richard
Physics , 2009, DOI: 10.1103/PhysRevA.80.054502
Abstract: We investigate the domain of masses for which a state with total orbital momentum L=1 and unnatural parity $P=+1$ exists for the Coulomb systems $(m_1^+,m_2^-,m_3^-)$.
SOME ASPECTS OF ANTIPROTON--NUCLEUS PHYSICS
Jean-Marc RICHARD
Physics , 1995,
Abstract: A brief review of antiproton--nucleus physics is presented. Some topics are related to early LEAR experiments, and others to more recent measurements or proposals. These include: exotic molecules, elastic and inelastic scattering, deep annihilation, strangeness production, neutron--antineutron oscillations, halo nuclei, antiproton production in nuclear reactions etc.
Tests of flavour independence in heavy quark potential models
Jean-Marc Richard
Physics , 1994, DOI: 10.1016/0920-5632(95)00115-P
Abstract: We review some rigourous consequences of flavour independence on the spectrum and properties of hadrons in potential models, with emphasis on hadrons with two heavy quarks, such as $(b\bar c)$ mesons and $(QQq)$ baryons.
Spin and Flavour: Concluding Remarks
Jean-Marc Richard
Physics , 1993,
Abstract: Summmary talk at the Workshop on Sin and Flavour in Hadronic and Electromagnetic Interactions, Turin (Italy), september 1992, to appear in the Proceedings,
Antiproton Induced Reactions
Jean-Marc Richard
Physics , 1994, DOI: 10.1007/BF01689773
Abstract: The various aspects of antiproton physics are shortly reviewed, and its relevance for the possible discovery of new particles and effects is pointed out. Then a survey of the nucleon-antinucleon interactions is given. In the nucleon-antinucleon annihilations, there is a big amount of experimental data that call for theoretical explanation. Importance of specific spin and isospin channels for our understanding of antiproton physics is stressed.
Critically-bound four-body molecules
Jean-Marc Richard
Physics , 2003, DOI: 10.1103/PhysRevA.67.034702
Abstract: The $(p,d,\bar{p},\bar{d})$ molecule, with a proton, a deuteron and their antiparticles, is stable againt spontaneous dissociation, but none of its three-body subsystems are stable. This molecule should be built by combining two atoms, for instance a protonium $(p\bar{p})$ and its heavier analogue $(d\bar{d})$. Most other four-body molecules have at least one stable three-body subsystem and thus can be built by adding the constituents one by one.
Hadrons with Two Heavy Quarks
Jean-Marc Richard
Physics , 1994,
Abstract: We review the spectroscopy and some properties of hadrons containing two charmed quarks, or more generally, two heavy quarks. This includes heavy baryons such as $(bcu)$, and possible exotic multiquark states.
Stability of the Hydrogen and Hydrogen-like Molecules
Jean-Marc Richard
Physics , 1994, DOI: 10.1103/PhysRevA.49.3573
Abstract: We present a simple proof of the stability of the hydrogen molecule $(M^+M^+m^-m^-)$. It does not rely on the proton-to-electron mass ratio $M/m$ being very large, and actually holds for arbitrary values of $M/m$. Some asymmetric molecules of the type $(m_1^+m_2^+m_3^-m_4^-)$ are also stable. Possible applications to molecules containing antiparticles and to exotic hadrons in the quark model are briefly outlined. Revtex Version 3.0, 4 Figures available on request by Fax or Mail.
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