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Holographic decays of largespin mesons
"... Abstract: We study the decay process of largespin mesons in the context of the gauge/string duality, using generic properties of confining backgrounds and systems with flavour branes. In the string picture, meson decay corresponds to the quantummechanical process in which a string rotating on the ..."
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Abstract: We study the decay process of largespin mesons in the context of the gauge/string duality, using generic properties of confining backgrounds and systems with flavour branes. In the string picture, meson decay corresponds to the quantummechanical process in which a string rotating on the IR “wall ” fluctuates, touches a flavour brane and splits into two smaller strings. This process automatically encodes flavour conservation as well as the Zweig rule. We show that the decay width computed in the string picture is in remarkable agreement with the decay width obtained using the phenomenological Lund model. Keywords: AdS/CFT, meson decay, spinning strings. Contents
The string/gauge theory correspondence in QCD
, 2007
"... Ideas about a duality between gauge fields and strings have been around for many decades. During the last ten years, these ideas have taken a much more concrete mathematical form. String descriptions of the strongly coupled dynamics of semirealistic gauge theories, exhibiting confinement and chira ..."
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Ideas about a duality between gauge fields and strings have been around for many decades. During the last ten years, these ideas have taken a much more concrete mathematical form. String descriptions of the strongly coupled dynamics of semirealistic gauge theories, exhibiting confinement and chiral symmetry breaking, are now available. These provide remarkably simple ways to compute properties of the strongly coupled quarkgluon fluid phase, and also shed new light on various phenomenological models of hadron fragmentation. We present a review and highlight some exciting recent developments.
Identified Particle Transverse Momentum Distributions from Au+Au Collisions at 62.4 GeV per Nucleon Pair
, 2005
"... llansverse momentum (pT) distributions for pions, kaons, protons and antiprotons have been measured near midrapidity for Au+Au collisions at,/ = = 62.4 GeV using the PHOBOS detector at the Relativistic HeavyIon Collider (RHIC) in Brookhaven National Laboratory. Particle identification is perform ..."
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llansverse momentum (pT) distributions for pions, kaons, protons and antiprotons have been measured near midrapidity for Au+Au collisions at,/ = = 62.4 GeV using the PHOBOS detector at the Relativistic HeavyIon Collider (RHIC) in Brookhaven National Laboratory. Particle identification is performed using the PHOBOS TimeofFlight plastic scintillator walls and specific energy loss in the multilayer silicon Spectrometer, which is also used for track reconstruction and momentumdet ermination. The spectra are corrected for all det ectordependent effects, including feeddown from weak decays. At p, 3 GeV/c, protons are measured to be the dominant species of charged hadrons and scale much faster with respect to collision centrality than mesons. This behaviour at 62.4 GeV is found to be remarkably similar to that observed in Au+Au collisions at 200 GeV, an interesting observation which should serve as an important constraint on the various mechanisms which have been proposed to describe particle production over this p r range.
1 PENTAQUARKS IN CHIRAL SOLITON MODELS; notes and discussion. 1
, 2005
"... The spectra of pentaquarks, some of them being observed recently, are discussed within topological soliton model and compared with simplified quark picture. Results obtained within chiral soliton model depend to some extent on the quantization scheme: rigid rotator, soft rotator, or bound state mode ..."
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The spectra of pentaquarks, some of them being observed recently, are discussed within topological soliton model and compared with simplified quark picture. Results obtained within chiral soliton model depend to some extent on the quantization scheme: rigid rotator, soft rotator, or bound state model. The similarity of spectra of baryon resonances obtained within quark model and chiral soliton model is pointed out, although certain differences take place as well, which require careful interpretation. In particular, considerable variation of the strange antiquark mass in different SU(3) multiplets of pentaquarks is required to fit their spectra obtained from chiral solitons. Certain difference of masses of ”good ” and ”bad ” diquarks is required as well, in qualitative agreement with previously made estimates. The partners of exotic states with different values of spin which belong to higher SU(3) multiplets, have the energy considerably higher than states with lowest spin, and this could be a point where the difference from simple quark models is striking. The antiflavor excitation energies for multibaryons are estimated as well, and binding energies of Θhypernuclei and anticharm (antibeauty) hypernuclei are presented for several baryon numbers. Some deficiencies in the argumentation against validity of the chiral soliton approach and/or SU(3) quantization models, existing in the literature, are pointed out. 1
1 PENTAQUARKS IN CHIRAL SOLITON MODELS 1.
, 2006
"... The spectra of pentaquarks, some of them being observed recently, are discussed within topological soliton model and compared with simplified quark picture. Results obtained within chiral soliton model depend to some extent on the quantization scheme: rigid rotator, soft rotator, or bound state mode ..."
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The spectra of pentaquarks, some of them being observed recently, are discussed within topological soliton model and compared with simplified quark picture. Results obtained within chiral soliton model depend to some extent on the quantization scheme: rigid rotator, soft rotator, or bound state model. The similarity of spectra of baryon resonances obtained within quark model and chiral soliton model is pointed out, although certain differences take place as well, which require careful interpretation. In particular, considerable variation of the strange antiquark mass in different SU(3) multiplets of pentaquarks is required to fit their spectra obtained from chiral solitons. Certain difference of masses of ”good ” and ”bad ” diquarks is required as well, in qualitative agreement with previously made estimates. The partners of exotic states with different values of spin which belong to higher SU(3) multiplets, have the energy considerably higher than states with lowest spin, and this could be a point where the difference from simple quark models is striking. The antiflavor excitation energies for multibaryons are estimated as well, and binding energies of Θhypernuclei and anticharm (antibeauty) hypernuclei are presented for several baryon numbers. Some deficiencies in the argumentation against validity of the chiral soliton approach and/or SU(3) quantization models, existing in the literature, are pointed out. 1
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"... I review recent developments in lattice calculations of nucleon structure. In particular, I cover the calculations of nucleon matrix elements related to generalized parton distribution functions, structure functions and form factors. PoS(LAT2006)018 ..."
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I review recent developments in lattice calculations of nucleon structure. In particular, I cover the calculations of nucleon matrix elements related to generalized parton distribution functions, structure functions and form factors. PoS(LAT2006)018
A Holographic Model of Deconfinement and Chiral Symmetry Restoration
, 2006
"... We analyze the finite temperature behavior of the SakaiSugimoto model, which is a holographic dual of a theory which spontaneously breaks a U(Nf)L×U(Nf)R chiral flavor symmetry at zero temperature. The theory involved is a 4+1 dimensional supersymmetric SU(Nc) gauge theory compactified on a circle ..."
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We analyze the finite temperature behavior of the SakaiSugimoto model, which is a holographic dual of a theory which spontaneously breaks a U(Nf)L×U(Nf)R chiral flavor symmetry at zero temperature. The theory involved is a 4+1 dimensional supersymmetric SU(Nc) gauge theory compactified on a circle of radius R with antiperiodic boundary conditions for fermions, coupled to Nf lefthanded quarks and Nf righthanded quarks which are localized at different points on the compact circle (separated by a distance L). In the supergravity limit which we analyze (corresponding in particular to the large Nc limit of the gauge theory), the theory undergoes a deconfinement phase transition at a temperature Td = 1/2πR. For quark separations obeying L> Lc ≃ 0.97 ∗ R the chiral symmetry is restored at this temperature, but for L < Lc ≃ 0.97 ∗ R there is an intermediate phase which is deconfined with broken chiral symmetry, and the chiral symmetry is restored at TχSB ≃ 0.154/L. All of these phase transitions are of first order.
The CBELSA/TAPS Collaboration
"... EPJ manuscript No. (will be inserted by the editor) ..."
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