Spin and parity measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Λ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1405</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math>baryon

Moriya, K.; Schumacher, R. A.; Aghasyan, M.; Amaryan, M. J.; Pereira, S. Anefalos; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Bellis, M.; Biselli, A.; Bono, J.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Burkert, Volker; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Cole, P. L.; Collins, P.; Contalbrigo, M.; Cortes, O.; Credé, V.; D’Angelo, A.; Dashyan, N.; Vita, R. De; Sanctis, E. De; Dey, B.; Djalali, C.; Dugger, M.; Dupré, R.; Egiyan, H.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Fegan, S.; Fleming, J. A.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Guidal, M.; Griffioen, K. A.; Hafidi, K.; Hakobyan, H.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Ишханов, Б. С.; Isupov, E. L.; Jo, H. S.; Joo, K. S.; Keller, D.; Khandaker, M.; Kim, W.; Koirala, S.; Kubarovsky, V.; Kuleshov, S.; Lenisa, P.; Lu, H. Y.; MacGregor, I. J. D.; Markov, N.; McCracken, M. E.; McKinnon, B.; Mestayer, M. D.; Meyer, C. A.; Mirazita, M.; Mokeev, V.; Montgomery, R. A.; Moutarde, H.; Munévar, E.; Nadel-Turoński, P.; Niccolai, S.; Niculescu, I.; Osipenko, M.; Pappalardo, L. L.; Pasyuk, E.; Peng, P.; Phillips, J. J.; Pisano, S.; Pogorelko, O.; Pozdniakov, S.; Price, J. W.; Procureur, S.; Puckett, A. J. R.; Raue, B. A.; Rimal, D.; Ripani, M.; Ritchie, B. G.; Rizzo, A.; Rosner, G.; Roy, P.; Sabatié, F.; Salgado, C.; Schott, D.; Seder, E.; Senderovich, I.; Smith, E. S.; Sokhan, D.; Smith, G. D.; Stepanyan, S.; Strauch, S.; Tang, W.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Watts, D. P.; Weinstein, L. B.; Williams, M.; Wood, M. H.; Zachariou, N.; Zana, L.; Zhang, J.; Ziegler, V.; Zhao, Z. W.; Zonta, I.

doi:10.1103/physrevlett.112.082004

Cited by 50 publications

(30 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lowest-lying state in the negative parity sector, the Λ(1405), is highly debated since its mass is surprisingly low; in fact, despite its strange quark content it is even lower than the ground state in the corresponding non-strange channel. Its spin and parity quantum numbers have only been identified unambiguously from photoproduction data at Jefferson Lab [34]. Quark models assign a dominant flavour singlet nature to this state, which seems confirmed by exploratory lattice calculations [35,36].…”

Section: Nucleon Resonancesmentioning

confidence: 86%

See 1 more Smart Citation

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

418

530

View full text Add to dashboard Cite

We review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD. The composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and other) currents. Both present many unsolved problems despite decades of experimental and theoretical research. We discuss the progress in these fields from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We give a systematic overview as to how results are obtained in this framework and explain technical connections to lattice QCD. We also discuss the mutual relations to the quark model, which still serves as a reference to distinguish 'expected' from 'unexpected' physics. We confront recent results on the spectrum of non-strange and strange baryons, their form factors and the issues of two-photon processes and Compton scattering determined in the DysonSchwinger framework with those of lattice QCD and the available experimental data. The general aim is to identify the underlying physical mechanisms behind the plethora of observable phenomena in terms of the underlying quark and gluon degrees of freedom.

show abstract

Section: Nucleon Resonancesmentioning

confidence: 86%

“…2 led to significant activity aimed at understanding and resolving this discrepancy. It was noted early [16] that there was significant scatter between the results of different Rosenbluth extractions [11,31,32,33,34], as illustrated in Fig. 3, suggesting that the problem was related to the cross section measurements.…”

Section: Verification Of the Discrepancymentioning

confidence: 97%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

418

530

View full text Add to dashboard Cite

show abstract

“…In principle, one requires the four independent observables calculated here to completely determine the reaction amplitude [55]. Of course, measurements of the spin obervables, in particular, are challenging experimentally by any standard, but one may exploit the self-analyzing nature of the produced hyperon to help extract these observables [55,72]. For the target-recoil asymmetry measurements, one requires a polarized target in addition to spin measurements of the produced Ξ. Polarized targets available at some of the world's major laboratories combined with the availability of intense beams make measuring these spin observables no longer out of reach.…”

Section: Discussionmentioning

confidence: 99%

K¯+N→K+Ξreaction andS=−1hyperon resonances

Jackson

Haberzettl

et al. 2015

Phys. Rev. C

View full text Add to dashboard Cite

TheK+N → K +Ξ reaction is studied for center-of-momentum energies ranging from threshold to 3 GeV in an effective Lagrangian approach that includes the hyperon s-and u-channel contributions as well as a phenomenological contact amplitude. The latter accounts for the rescattering term in the scattering equation and possible short-range dynamics not included explicitly in the model. Existing data are well reproduced and three above-the-threshold resonances were found to be required to describe the data, namely, the Λ(1890), Σ(2030), and Σ(2250). For the latter resonance we have assumed the spin-parity of J P = 5/2 − and a mass of 2265 MeV. The Σ(2030) resonance is crucial in achieving a good reproduction of not only the measured total and differential cross sections, but also the recoil polarization asymmetry. More precise data are required before a more definitive statement can be made about the other two resonances, in particular, about the Σ(2250) resonance that is introduced to describe a small bump structure observed in the total cross section ofThe present analysis also reveals a peculiar behavior of the total cross section data in the threshold energy region in K − + p → K + + Ξ − , where the P -and D-waves dominate instead of the usual S-wave. Predictions for the target-recoil asymmetries of theK + N → K + Ξ reaction are also presented.

show abstract

“…However, other analyses interpret the low-mass NK and πΣ spectra with a single resonance [47,48,49]. The emphasis of the present analysis is not a study of Λ(1405)1/2 − properties: important data on πΣ interactions below the K − p threshold [51,52,53], on the K − p atom [54,55], and on K − p decays at rest [56,57] are not included in this analysis. For this reason, we introduce Λ(1405)1/2 − as a single resonance with fixed parameters from Ref.…”

Section: The λ * Hyperonsmentioning

confidence: 99%

Hyperon II: Properties of excited hyperons

et al. 2019

View full text Add to dashboard Cite

We report properties of Λ and Σ hyperon resonances formed in K − induced reactions. Special emphasis is laid on the analysis of the three-body final states 2π 0 Λ and 2π 0 Σ and of the quasi-two-body final states πΛ(1520),K∆(1232), πΣ(1385),K * N , and ωΛ. We give pole positions of Λ and Σ hyperon resonances and transition residues from the K − p initial to various final states as well as Breit-Wigner masses and widths and decay branching ratios. Twenty resonances and "bumps" reported in the Review of Particle Physics are not required in our fits, evidence for five new resonances is reported. The observed mass spectrum is compared to the spectrum calculated in the Bonn quark model. Three spin doublets, six Λ hyperons, are tentatively assigned to the SU(3) singlet system.2 Data on K − p → three-body finals states 2.1 Reactions K − p → π 0 π 0 Λ and K − p → π 0 π 0 Σ The reactions K − p → π 0 π 0 Λ [18] and K − p → π 0 π 0 Σ [19] were studied at BNL at eight incident K − momenta between 514 and 750 MeV/c using the Crystal Ball multiphoton spectrometer. Figure 1 shows the Dalitz plots for the arXiv:1907.13387v1 [nucl-ex]

show abstract

Spin and parity measurement of theΛ(1405)baryon

Cited by 50 publications

References 17 publications

Baryons as relativistic three-quark bound states

Baryons as relativistic three-quark bound states

K¯+N→K+Ξreaction andS=−1hyperon resonances

Hyperon II: Properties of excited hyperons

Contact Info

Product

Resources

About