RECENT PROGRESS IN CHARMONIUM PHYSICS: ROLE OF HEAVY MESON LOOPS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 353-358
Author(s):  
CHRISTOPH HANHART
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Recent Progress ◽  
Heavy Meson ◽  
Effective Field ◽  
The Other ◽  
Inelastic Threshold ◽  
New States ◽  
Molecular Nature

In recent years a large number of new states in the charm sector was discovered above the first inelastic threshold that not at all match to the predictions of the quark model, which on the other hand was extremely successful below that threshold. Since most of those states are located close to a two–hadron threshold, many authors proposed a molecular nature for them. In this talk we will collect the evidences and discuss how the picture can be tested further. In addition, if hadron loops induce non-perturbative effects above the inelastic threshold, one should also expect them to have some impact on the properties of standard charmonia. In the last part of this write-up an effective field theory is introduced that allows one to investigate this issue systematically.

Recent Results from Nuclear Lattice Simulations

2007 ◽  
Vol 22 (07n10) ◽  
pp. 555-564
Author(s):  
DEAN LEE
Keyword(s):  
Field Theory ◽  
Nuclear Matter ◽  
Effective Field Theory ◽  
Recent Progress ◽  
Effective Field ◽  
Matter Density ◽  
Neutron Matter ◽  
Chiral Effective Field Theory ◽  
Nuclear Matter Density ◽  
Work Done

We discuss recent progress in the study of nuclear and neutron matter by combining chiral effective field theory with non-perturbative lattice methods. We present results for hot neutron matter at temperatures 20 to 40 MeV and densities below twice nuclear matter density. This proceedings article is a summary of results from work done in collaboration with Bugra Borasoy and Thomas Schaefer1.

scholarly journals The Role of Scalar Mesons in Extended Perturbation Scheme for Effective Field Theory

2008 ◽  
Author(s):  
Kirill Semenov-Tian-Shansky ◽  
Alexander Vereshagin ◽  
Vladimir Vereshagin ◽  
George Rupp ◽  
Eef van Beveren ◽  
...  
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Perturbation Scheme ◽  
Scalar Mesons

scholarly journals Heavy hybrids and tetraquarks in effective field theory

2019 ◽  
Vol 202 ◽  
pp. 01005 ◽  
Author(s):  
Jaume Tarrús Castellà
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Bound States ◽  
Heavy Meson ◽  
Effective Field ◽  
Full Description ◽  
Wilson Loops ◽  
Inclusive Decays ◽  
Lattice Calculations

We report on an effective field theory (EFT) description of exotic quarkonia as bound states on the spectrum of hybrid and tetraquarks static energies. We provide expressions for hybrid and tetraquarks static energies in terms of Wilson loops. The former have been computed in quenched lattice calculations but the latter are yet unavailable. From the few simulations with dynamical light-quarks we argue that the overall picture from hybrid static energies does not change but additional states, such as heavy meson pairs, need to be considered for a full description. In this EFT framework for quarkonium hybrids, we report on recent results for mixing with standard quarkonium, spin-dependent contributions, and semi-inclusive decays.

scholarly journals Role of trans-Planckian modes in cosmology

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Arjun Berera ◽  
Suddhasattwa Brahma ◽  
Jaime R. Calderón
Keyword(s):  
Field Theory ◽  
Power Spectrum ◽  
Effective Field Theory ◽  
Effective Field ◽  
Inflationary Cosmology ◽  
De Sitter ◽  
Warm Inflation ◽  
Primordial Power Spectrum ◽  
Hubble Horizon

Abstract Motivated by the old trans-Planckian (TP) problem of inflationary cosmology, it has been conjectured that any consistent effective field theory should keep TP modes ‘hidden’ behind the Hubble horizon, so as to prevent them from turning classical and thereby affecting macroscopic observations. In this paper we present two arguments against the Hubble horizon being a scale of singular significance as has been put forward in the TP Censorship Conjecture (TCC). First, refinements of TCC are presented that allow for the TP modes to grow beyond the horizon while still keeping the de-Sitter conjecture valid. Second, we show that TP modes can turn classical even well within the Hubble horizon, which, as such, negates this rationale behind keeping them from crossing it. The role of TP modes is known to be less of a problem in warm inflation, because fluctuations start out usually as classical. This allows warm inflation to be more resilient to the TP problem compared to cold inflation. To understand how robust this is, we identity limits where quantum modes can affect the primordial power spectrum in one specific case.

scholarly journals HEAVY MESON MOLECULES IN EFFECTIVE FIELD THEORY

2007 ◽  
Author(s):  
MOHAMMAD T. ALFIKY ◽  
FABRIZIO GABBIANI ◽  
ALEXEY A. PETROV
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Heavy Meson ◽  
Effective Field
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