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Author 
YamagataSekihara, J.; Roca, L.; Oset, E. 


Title 
Nature of the K2*(1430), K3*(1780), K4*(2045), K5*(2380), and K6* as K*multirho states 
Type 
Journal Article 

Year 
2010 
Publication 
Physical Review D 
Abbreviated Journal 
Phys. Rev. D 


Volume 
82 
Issue 
9 
Pages 
094017  8pp 


Keywords 



Abstract 
We show that the K2*(1430), K3*(1780), K4*(2045), K5*(2380), and a notyetdiscovered K6* resonance are basically molecules made of an increasing number of rho(770) and one K*(892) mesons. The idea relies on the fact that the vectorvector interaction in the s wave with spins aligned is very strong for both rho rho and K*rho. We extend a recent work, where several resonances showed up as multirho(770) molecules, to the strange sector including the K*(892) into the system. The resonant structures show up in the multibody scattering amplitudes, which are evaluated in terms of the unitary twobody vectorvector scattering amplitudes by using the fixed center approximation to the Faddeev equations. 


Address 
[YamagataSekihara, J.; Oset, E.] Univ Valencia, CSIC, Dept Fis Teor IFIC, Ctr Mixto,Inst Invest Paterna, Valencia 46071, Spain 


Corporate Author 

Thesis 



Publisher 
Amer Physical Soc 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
15507998 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
ISI:000284206500003 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ elepoucu @ 
Serial 
323 

Permanent link to this record 




Author 
Roca, L.; Oset, E. 


Title 
Description of the f(2)(1270), rho(3)(1690), f(4)(2050), rho(5)(2350), f(6)(2510) resonances as multirho(770) states 
Type 
Journal Article 

Year 
2010 
Publication 
Physical Review D 
Abbreviated Journal 
Phys. Rev. D 


Volume 
82 
Issue 
5 
Pages 
054013  11pp 


Keywords 



Abstract 
In a previous work regarding the interaction of two rho(770) resonances, the f(2)(1270) (J(PC) = 2(++)) resonance was obtained dynamically as a tworho molecule with a very strong binding energy, 135 MeV per rho particle. In the present work we use the rho rho interaction in spin 2 and isospin 0 channel to show that the resonances rho(3)(1690) (3()), f(4)(2050) (4(++)), rho(5)(2350) (5()), and f(6)(2510) (6(++)) are basically molecules of increasing number of rho(770) particles. We use the fixed center approximation of the Faddeev equations to write the multibody interaction in terms of the twobody scattering amplitudes. We find the masses of the states very close to the experimental values and we get an increasing value of the binding energy per rho as the number of rho mesons is increased. 


Address 
[Roca, L.] Univ Murcia, Dept Fis, E30071 Murcia, Spain 


Corporate Author 

Thesis 



Publisher 
Amer Physical Soc 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
15507998 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
ISI:000281791100002 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ elepoucu @ 
Serial 
381 

Permanent link to this record 




Author 
Roca, L.; Oset, E. 


Title 
Asymmetry observables in e(+)e() > pi(+) pi() gamma in the phi region within a chiral unitary approach 
Type 
Journal Article 

Year 
2010 
Publication 
Physical Review D 
Abbreviated Journal 
Phys. Rev. D 


Volume 
81 
Issue 
1 
Pages 
014010  8pp 


Keywords 



Abstract 
We make a theoretical study of the charge and forwardbackward pion asymmetries in the e(+)e() > pi(+) pi() gamma process on and off the phi resonance energy. These observables are rather sensitive to the inner details of the theoretical models to describe the reaction. In addition to the standard implementation of the initial state radiation and the bremsstrahlung contribution to the final state radiation, we use the techniques of the chiral unitary approach to evaluate the contribution from the mechanisms of phi decay into pi(+) pi() gamma. This contribution involves the implementation of final state interaction from direct chiral loops, the exchange of vector and axialvector resonances and the final state interaction through the consideration of the mesonmeson unitarized amplitudes, which were found important in a previous work describing the phi > pi pi gamma. We find a good reproduction of the experimental data from KLOE for the forwardbackward asymmetry, both at the phi peak and away from it. We also make predictions for the angular distributions of the charge asymmetry and show that this observable is very sensitive to the chiral loops involved in phi radiative decay. 


Address 
[Roca, L.] Univ Murcia, Dept Fis, E30071 Murcia, Spain 


Corporate Author 

Thesis 



Publisher 
Amer Physical Soc 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
15507998 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
ISI:000274002800021 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ elepoucu @ 
Serial 
503 

Permanent link to this record 




Author 
Roca, L.; Oset, E. 


Title 
Scattering of unstable particles in a finite volume: The case of pi rho scattering and the a(1)(1260) resonance 
Type 
Journal Article 

Year 
2012 
Publication 
Physical Review D 
Abbreviated Journal 
Phys. Rev. D 


Volume 
85 
Issue 
5 
Pages 
054507  13pp 


Keywords 



Abstract 
We present a way to evaluate the scattering of unstable particles quantized in a finite volume with the aim of extracting physical observables for infinite volume from lattice data. We illustrate the method with the pi rho scattering which generates dynamically the axialvector a(1)(1260) resonance. Energy levels in a finite box are evaluated both considering the rho as a stable and unstable resonance and we find significant differences between both cases. We discuss how to solve the problem to get the physical scattering amplitudes in the infinite volume, and hence phase shifts, from possible lattice results on energy levels quantized inside a finite box. 


Address 
[Roca, L.] Univ Murcia, Dept Fis, E30071 Murcia, Spain 


Corporate Author 

Thesis 



Publisher 
Amer Physical Soc 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
15507998 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
WOS:000301706700004 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ pastor @ 
Serial 
941 

Permanent link to this record 




Author 
Oset, E.; Martinez Torres, A.; Khemchandani, K.P.; Roca, L.; YamagataSekihara, J. 


Title 
Two, three, many body systems involving mesons 
Type 
Journal Article 

Year 
2012 
Publication 
Progress in Particle and Nuclear Physics 
Abbreviated Journal 
Prog. Part. Nucl. Phys. 


Volume 
67 
Issue 
2 
Pages 
455460 


Keywords 
Meson many body; Chiral dynamics; Dynamically generated resonances 


Abstract 
In this talk we show recent developments on few body systems involving mesons. We report on an approach to Faddeev equations using chiral unitary dynamics, where an explicit cancellation of the two body off shell amplitude with three body forces stemming from the same chiral Lagrangians takes place. This removal of the unphysical off shell part of the amplitudes is most welcome and renders the approach unambiguous, showing that only on shell two body amplitudes need to be used. Within this approach, systems of two mesons and one baryon are studied, reproducing properties of the low lying 1/2(+) states. On the other hand we also report on multirho and K* multirho states which can be associated to known meson resonances of high spin. 


Address 
[Oset, E.; Yamagata, J.] Ctr Mixto CSIC UV, Inst Fis Corpuscular, Inst Invest Paterna, Valencia 46071, Spain, Email: oset@ific.uv.es 


Corporate Author 

Thesis 



Publisher 
Elsevier Science Bv 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
01466410 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
WOS:000303282200060 
Approved 
no 


Is ISI 
yes 
International Collaboration 
yes 


Call Number 
IFIC @ pastor @ 
Serial 
998 

Permanent link to this record 




Author 
Albaladejo, M.; Oller, J.A.; Oset, E.; Rios, G.; Roca, L. 


Title 
Finite volume treatment of pi pi scattering and limits to phase shifts extraction from lattice QCD 
Type 
Journal Article 

Year 
2012 
Publication 
Journal of High Energy Physics 
Abbreviated Journal 
J. High Energy Phys. 


Volume 
08 
Issue 
8 
Pages 
071  22pp 


Keywords 
Lattice QCD; Chiral Lagrangians; Phenomenological Models 


Abstract 
We study theoretically the effects of finite volume for pi pi scattering in order to extract physical observables for infinite volume from lattice QCD. We compare three different approaches for pi pi scattering (lowest order BetheSalpeter approach, N/D and inverse amplitude methods) with the aim of studying the effects of the finite size of the box in the potential of the different theories, specially the lefthand cut contribution through loops in the crossed t, uchannels. We quantify the error made by neglecting these effects in usual extractions of physical observables from lattice ()CD spectrum. We conclude that for pi pi phaseshifts in the scalarisoscalar channel up to 800 MeV this effect is negligible for box sizes bigger than 2,5m(pi)(1) and of the order of 5% at around 1.5 – 2m(pi)(1). For isospin 2 the finite size effects can reach up to 10% for that energy. We also quantify the error made when using the standard Luscher method to extract physical observables from lattice QCD, which is widely used in the literature but is an approximation of the one used in the present work. 


Address 
[Albaladejo, M.; Oller, J. A.; Rios, G.; Roca, L.] Univ Murcia, Dept Fis, E30100 Murcia, Spain, Email: albaladejo@um.es; 


Corporate Author 

Thesis 



Publisher 
Springer 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
11266708 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
WOS:000309883600014 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ pastor @ 
Serial 
1214 

Permanent link to this record 




Author 
Roca, L.; Oset, E. 


Title 
Lambda(1405) poles obtained from pi(0)Sigma(0) photoproduction data 
Type 
Journal Article 

Year 
2013 
Publication 
Physical Review C 
Abbreviated Journal 
Phys. Rev. C 


Volume 
87 
Issue 
5 
Pages 
055201  8pp 


Keywords 



Abstract 
We present a strategy to extract the position of the two Lambda(1405) poles from experimental photoproduction data measured recently at different energies in the gamma p > K+pi(0)Sigma(0) reaction at Jefferson Laboratory. By means of a chiral dynamics motivated potential with free parameters, we solve the BetheSalpeter equation in the coupled channels (K) over barN and pi Sigma in isospin I = 0 and parametrize the amplitude for the photonuclear reaction in terms of a linear combination of the pi Sigma > pi Sigma and (K) over barN > pi Sigma scattering amplitudes in I = 0, with a different linear combination for each energy. Good fits to the data are obtained with some sets of parameters, by means of which one can also predict the cross section for the K p > pi(0)Sigma(0) reaction. These later results help us decide among the possible solutions. The result is that the different solutions lead to two poles similar to those found in the chiral unitary approach. With the best result we find the two Lambda(1405) poles at 1385 – 68i MeV and 1419 – 22i MeV. 


Address 
Univ Murcia, Dept Fis, E30100 Murcia, Spain 


Corporate Author 

Thesis 



Publisher 
Amer Physical Soc 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
05562813 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
WOS:000318527400004 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ pastor @ 
Serial 
1442 

Permanent link to this record 




Author 
Roca, L.; Oset, E. 


Title 
Isospin 0 and 1 resonances from pi Sigma photoproduction data 
Type 
Journal Article 

Year 
2013 
Publication 
Physical Review C 
Abbreviated Journal 
Phys. Rev. C 


Volume 
88 
Issue 
5 
Pages 
055206  7pp 


Keywords 



Abstract 
Recently we presented a successful strategy to extract the position of the two Lambda ( 1405) poles from experimental photoproduction data on the gamma p > K+pi(0)Sigma(0) reaction at Jefferson Lab. Following a similar strategy, we extend the previous method to incorporate also the isospin 1 component which allows us to consider in addition the experimental data on gamma p > K+pi(+/)Sigma(/+). The idea is based on considering a production mechanism as model independent as possible and implementing the final state interaction of the final mesonbaryon pair based on small modifications of the unitary chiral perturbation theory amplitudes. Good fits to the data are obtained with this procedure, by means of which we can also predict the cross sections for the K p > (K) over barN, pi Sigma, and pi Lambda reactions for the different charge channels. Besides the two poles found for the Lambda(1405) resonance, we discuss the possible existence of an isospin 1 resonance in the vicinity of the (K) over barN threshold. 


Address 
[Roca, L.] Univ Murcia, Dept Fis, E30100 Murcia, Spain 


Corporate Author 

Thesis 



Publisher 
Amer Physical Soc 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
05562813 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
WOS:000327315800008 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ pastor @ 
Serial 
1655 

Permanent link to this record 




Author 
Aceti, F.; Oset, E.; Roca, L. 


Title 
Composite nature of the Lambda (1520) resonance 
Type 
Journal Article 

Year 
2014 
Publication 
Physical Review C 
Abbreviated Journal 
Phys. Rev. C 


Volume 
90 
Issue 
2 
Pages 
025208  8pp 


Keywords 



Abstract 
Recently, the Weinberg compositeness condition of a bound state was generalized to account for resonant states and higher partial waves. We apply this extension to the case of the Lambda (1520) resonance and quantify the weight of the mesonbaryon components in contrast to other possible genuine building blocks. This resonance was theoretically obtained from a coupled channels analysis using the swave pi Sigma* and K Xi* and the dwave (K) over bar N and pi Sigma channels, applying the techniques of the chiral unitary approach. We obtain the result that this resonance is essentially dynamically generated from these mesonbaryon channels, leaving room for only 15% weight of other kinds of components in its wave function. 


Address 
[Aceti, F.; Oset, E.] Univ Valencia, CSIC, Ctr Mixto, Inst Invest Paterna,Dept Fis Teor, E46071 Valencia, Spain 


Corporate Author 

Thesis 



Publisher 
Amer Physical Soc 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
05562813 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
WOS:000341271300006 
Approved 
no 


Is ISI 
yes 
International Collaboration 
no 


Call Number 
IFIC @ pastor @ 
Serial 
1907 

Permanent link to this record 




Author 
Roca, L.; Mai, M.; Oset, E.; Meissner, U.G. 


Title 
Predictions for the Lambda(b) > J/psi Lambda (1405) decay 
Type 
Journal Article 

Year 
2015 
Publication 
European Physical Journal C 
Abbreviated Journal 
Eur. Phys. J. C 


Volume 
75 
Issue 
5 
Pages 
218  9pp 


Keywords 



Abstract 
We calculate the shape of the pi Sigma and (K) over bar N invariant mass distributions in the Lambda(b) > J/psi pi Sigma and Lambda(b) > J/psi (K) over bar N decays that are dominated by the Lambda (1405) resonance. The weak interaction part is the same for both processes and the hadronization into the different mesonbaryon channels in the final state is given by symmetry arguments. The most important feature is the implementation of the mesonbaryon finalstate interaction using two chiral unitary models from different theoretical groups. Both approaches give a good description of antikaonnucleon scattering data, the complex energy shift in kaonic hydrogen and the line shapes of pi Sigma K in photoproduction, based on the twopole scenario for the Lambda (1405). We find that this reaction reflects more the higher mass pole and we make predictions of the line shapes and relative strength of the mesonbaryon distributions in the final state. 


Address 
[Roca, L.] Univ Murcia, Dept Fis, Murcia 30100, Spain, Email: luisroca@um.es; 


Corporate Author 

Thesis 



Publisher 
Springer 
Place of Publication 

Editor 



Language 
English 
Summary Language 

Original Title 



Series Editor 

Series Title 

Abbreviated Series Title 



Series Volume 

Series Issue 

Edition 



ISSN 
14346044 
ISBN 

Medium 



Area 

Expedition 

Conference 



Notes 
WOS:000355678900006 
Approved 
no 


Is ISI 
yes 
International Collaboration 
yes 


Call Number 
IFIC @ pastor @ 
Serial 
2271 

Permanent link to this record 