<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Λ</mml:mi><mml:mo>(</mml:mo><mml:mn>1405</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>poles obtained from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mi>Σ</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:mrow></mml:math>photoproduction data

Roca, L.; Oset, E.

doi:10.1103/physrevc.87.055201

Cited by 84 publications

(126 citation statements)

References 53 publications

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“…Invariant π mass distributions from pp scattering experiments have recently been measured by the COSY Collaboration at Jülich [23] and by the HADES Collaboration at GSI [24]. In parallel with the increased experimental activity, the theoretical models have been revisited [25][26][27][28][29][30] and analyses of the new reactions, aiming at pinning down the properties of the (1405) better, have been performed [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

2015

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The meson-baryon interaction in s wave in the strangeness S = −1 sector has been studied, employing a chiral SU(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels. The parameters of the Lagrangian have been fitted to a large set of experimental data in different two-body channels, paying special attention to theKN → K reaction, which is particularly sensitive to the NLO terms. With the aim of improving the model in the K production channels, effects of the high spin hyperon resonances (2030) and (2250) have been taken into account phenomenologically.

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Section: Introductionmentioning

confidence: 99%

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

2015

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“…We will refer the b, c and d coefficients by initial production (IP) parameters in the following. In [30,31] it is shown that already good results are obtained fitting only the IP parameters and keeping the chiral parameters like in the original works. But since we want to extract information from photoproduction, we can try to get results with better χ 2 /dof by allowing the basic chiral unitary model to vary slightly.…”

Section: Fit To Photoproduction Datamentioning

confidence: 98%

The two Λ(1405) poles from photoproduction data

Oset

Roca

2015

EPJ Web of Conferences

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Abstract. We present results extracting the position of the two Λ(1405) poles from experimental photoproduction data measured recently at different energies in the γp → K + π 0 Σ 0 and γp → K + π ± Σ ∓ reactions at Jefferson Lab. The analysis is done by means of a chiral dynamics motivated potential but with free parameters, which guarantees analyticity and unitarity in the solutions. With the best result we find the two Λ(1405) poles at about 1352 − 48i MeV and 1419 − 29i MeV.

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“…[5,6] where we use a chiral unitary inspired potential to implement the meson-baryon final state interaction in the γp → KπΣ but allowing it to vary slightly through free parameters to account for possible small corrections from theoretical unknowns. This freedom allows to fine tune the position of the two Λ(1405) by fitting the model to experimental data.…”

Section: Extraction Of Both Pole Positions Of the λ(1405) From Photopmentioning

confidence: 99%

On the Double Pole Structure of the Λ(1405)

Roca¹,

Nieves²,

Oset³

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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In the last decade there have been increased theoretical and experimental evidences about the existence of two poles associated to the Λ(1405). In this contribution we summarize several recent works presenting a successful strategy to extract the position of the two Λ(1405) poles from experimental photoproduction data on the γp → KπΣ reaction at Jefferson Lab. The idea is based on considering a production mechanism as model independent as possible and implementing the final state interaction of the final meson-baryon pair based on small modifications of the unitary chiral perturbation theory amplitudes. Precise values for the two poles of the Λ(1405) resonance are then provided. On the other hand, we also present other work where we analyze theoretically the Λ b → J/ψK − p reaction from where a recent LHCb experiment extracts a Λ(1405) contribution in the K − p spectrum close to threshold and two baryon states of hidden charm in the J/ψ p spectrum, claimed to be pentaquarks. By assuming that the observed narrow state around 4450 MeV has a nature stemming mostly fromD * Σ c andD * Σ * c coupled channel dynamics with J P = 3/2 − , we are able to describe simultaneously the shapes and relative strength of the K − p mass distribution close to threshold and the peak of the J/ψ p distribution.

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Λ(1405)poles obtained fromπ0Σ0photoproduction data

Cited by 84 publications

References 53 publications

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

TheK¯N→KΞreaction in coupled-channels chiral models up to next-to-leading order

The two Λ(1405) poles from photoproduction data

On the Double Pole Structure of the Λ(1405)

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