Low-energy {eta}N interactions: Scattering lengths and resonance parameters

We consider the impact of two recent ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}\ensuremath{\eta}n$ measurements on the $\ensuremath{\eta}N$ scattering length and $\ensuremath{\eta}N$ branching fractions for the $N(1535)$ and $N(1520)$ resonances within a coupled-channel analysis of $\ensuremath{\pi}N$ elastic scattering and $\ensuremath{\eta}N$ production data. The sensitivity of these results to model input is also explored.

[1]  A. Budzanowski,et al.  A precision determination of the mass of the η meson , 2005, hep-ex/0505006.

[2]  A. Green,et al.  {eta}-Nucleon scattering length and effective range uncertainties , 2004, nucl-th/0411024.

[3]  R. Workman,et al.  Dispersion relation constrained partial wave analysis ofπNelastic andπN→ηNscattering data: The baryon spectrum , 2003, nucl-th/0311089.

[4]  C. Hanhart,et al.  Pion nucleon scattering in a meson exchange model , 2003 .

[5]  J. P. McCarthy,et al.  Eta photoproduction on the proton for photon energies from 0.75 to 1.95 GeV. , 2002, Physical review letters.

[6]  A. Fix,et al.  The Eta-3N problem with separable interactions , 2002, nucl-th/0202080.

[7]  A. Lleres,et al.  Differential cross section measurement of η photoproduction on the proton from threshold to 1100 MeV , 2000, hep-ex/0011098.

[8]  B. Krippa.  Chiral expansion for low-energy eta-nucleon interactions with explicit resonance , 2001 .

[9]  J. Nieves,et al.  S 11 -N(1535) and -N(1650) resonances in meson-baryon unitarized coupled channel chiral perturbation theory , 2001, hep-ph/0104307.

[10]  J. Haidenbauer,et al.  $\eta N$ final-state interaction in incoherent photoproduction of $\eta$-mesons from the deuteron , 2001, nucl-th/0104011.

[11]  C. Hanhart,et al.  What is the structure of the Roper resonance , 2000 .

[12]  N. Kaiser,et al.  Chiral SU(3) dynamics with coupled channels: inclusion of p-wave multipoles , 1999, nucl-th/9912053.

[13]  S. Dytman,et al.  Baryon resonance extraction from πN data using a unitary multichannel model , 1999, nucl-th/9910012.

[14]  C. Hanhart,et al.  η- and η′-meson production in the reaction pn→dM near threshold , 1999, nucl-th/9905049.

[15]  A. Green,et al.  A coupled K-matrix description of the reactions pi+N -> pi+N, pi+N -> eta+N, gamma+N -> pi+N and gamma+N -> eta+N , 1999, nucl-th/9905011.

[16]  L. Tiator,et al.  Analysis of resonance multipoles from polarization observables in [eta] photoproduction , 1999, nucl-th/9902028.

[17]  V. Belyaev,et al.  Faddeev type calculation of eta d threshold scattering , 1998, nucl-th/9808009.

[18]  I. Šlaus,et al.  The New Determination of the ηN S-wave Scattering Length From a Three-Channel, Multi-Resonance Amplitude Analysis , 1998 .

[19]  U. Mosel,et al.  Unitary model for meson-nucleon scattering , 1997, nucl-th/9708051.

[20]  N. C. Mukhopadhyay,et al.  Constraining N∗(1535) parameters from the eta photoproduction , 1997 .

[21]  J. Yonnet,et al.  η-helium quasi-bound states , 1997, nucl-ex/9703002.

[22]  A. Green,et al.  $\eta$-nucleon scattering length and effective range , 1997, nucl-th/9703009.

[23]  B. Friman,et al.  η-meson photoproduction off protons and deuterons , 1997, nucl-th/9701022.

[24]  N. Kaiser,et al.  SU(3) chiral dynamics with coupled channels eta and kaon photoproduction , 1996, hep-ph/9607459.

[25]  B. L. Birbrair,et al.  Ambiguities in theη-nucleon scattering length determination , 1996 .

[26]  Abaev,et al.  S-wave resonance coupled-channel approach to the reactions pi -+p--> eta +n and K-+p--> eta + Lambda, and a determination of the eta n and eta Lambda scattering lengths. , 1996, Physical review. C, Nuclear physics.

[27]  N. Kaiser,et al.  Chiral dynamics and the S11 (1535) nucleon resonance , 1995, nucl-th/9507036.

[28]  N. Kaiser,et al.  Chiral dynamics and the low-energy kaon - nucleon interaction , 1995, nucl-th/9505043.

[29]  Pavan,et al.  Updated analysis of pi N elastic scattering data to 2.1 GeV: The baryon spectrum. , 1995, Physical review. C, Nuclear physics.

[30]  C. Wilkin,et al.  The reaction pd→3Heη near threshold , 1995 .

[31]  Macgregor,et al.  Near threshold photoproduction of eta mesons off the proton. , 1995, Physical review letters.

[32]  Yamazaki,et al.  Study of baryon resonances through gamma p--> eta p differential cross sections. , 1995, Physical review. C, Nuclear physics.

[33]  Bock,et al.  eta meson photoproduction on hydrogen near threshold. , 1995, Physical review. C, Nuclear physics.

[34]  Slaus,et al.  eta N S-wave scattering length in a three-coupled-channel, multiresonance, unitary model. , 1995, Physical review. C, Nuclear physics.

[35]  Nefkens,et al.  π N →η N and η N →η N partial-wave T matrices in a coupled, three-channel model , 1995, nucl-th/9501011.

[36]  B. Friman,et al.  Resonance Model for $\pi$N Scattering and $\eta$-Meson Production in the s$_{11}$ Channel , 1994, nucl-th/9408012.

[37]  L. Tiator,et al.  The ηNN coupling in eta photoproduction , 1994, nucl-th/9404013.

[38]  Wilkin,et al.  Near-threshold production of eta mesons. , 1993, Physical review. C, Nuclear physics.

[39]  K. Yazaki,et al.  A study of π-nucleon S-wave resonances and the η-nucleon interaction , 1992 .

[40]  C. Bennhold,et al.  Coherent and incoherent η-photoproduction from nuclei☆ , 1991 .

[41]  Q. Haider,et al.  Formation of an eta-mesic nucleus , 1986 .

[42]  Ford,et al.  Pion-nucleon partial-wave analysis to 1100 MeV. , 1985, Physical review. D, Particles and fields.

[43]  Liu,et al.  Off-shell model for threshold pionic eta production on a nucleon and for eta N scattering. , 1985, Physical review letters.

[44]  I. Siotis,et al.  Backward pi- p Reactions Between 0.6-GeV/c and 1-GeV/c , 1975 .

[45]  I. Siotis,et al.  Study of narrow mesons near their thresholds , 1973 .

[46]  V. Stenger,et al.  Production and Neutral Decay of the η Meson in π - p Collisions , 1970 .

[47]  B. Delcourt,et al.  Photoproduction of η meson between threshold and 900 MeV , 1969 .

[48]  F. Gasparini,et al.  CHARGE EXCHANGE AND PRODUCTION OF eta MESONS AND MULTIPLE NEUTRAL PIONS IN $pi$$sup -$p REACTIONS BETWEEN 654 AND 1247 MeV/c. , 1969 .

[49]  S. Tuan.  Dynamical Basis for η -Baryon Interactions , 1965 .