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${{\mathit N}}$ BARYONS ($\mathit S$ = 0, $\mathit I$ = 1/2) ${{\mathit p}}$, ${{\mathit N}^{+}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit u}}$ ${\mathit {\mathit d}}$; ${{\mathit n}}$, ${{\mathit N}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit d}}$ ${\mathit {\mathit d}}$

INSPIRE   JSON PDGID: B061

${{\mathit N}{(1440)}}$ $I(J^P)$ = $1/2(1/2^{+})$

Older and obsolete values are listed and referenced in the 2014 edition, Chinese Physics C38 070001 (2014).

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▸  exp ${{\mathit N}{(1440)}}$ POLE POSITION

REAL PART 1360 TO 1380 $(\approx 1370 )$ MeV

$-2{\times }$IMAGINARY PART 180 TO 205 $(\approx 190 )$ MeV

▸  exp ${{\mathit N}{(1440)}}$ ELASTIC POLE RESIDUE

MODULUS $\vert \mathit r\vert $ 50 TO 60 $(\approx 55 )$ MeV

PHASE $\theta $ -100 TO -80 $(\approx -90 )$ $^\circ{}$

▸  exp ${{\mathit N}{(1440)}}$ INELASTIC POLE RESIDUE

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \eta}}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit \Delta}}{{\mathit \pi}}$, ${\mathit P}{\mathrm -wave}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit K}}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit N}}$ (${{\mathit \pi}{\mathit \pi}}){}^{\mathit I = 0}_{{\mathit S}{\mathrm -wave}}$

${{\mathit N}{(1440)}}$ BREIT-WIGNER MASS 1410 TO 1470 $(\approx 1440 )$ MeV

${{\mathit N}{(1440)}}$ BREIT-WIGNER WIDTH 250 TO 450 $(\approx 350 )$ MeV

▸  exp ${{\mathit N}{(1440)}}$ PHOTON DECAY AMPLITUDES AT THE POLE

${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

▸  exp ${{\mathit N}{(1440)}}$ BREIT-WIGNER PHOTON DECAY AMPLITUDES

${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$ -0.080 TO -0.050 $(\approx -0.065 )$ GeV${}^{−1/2}$

${{\mathit N}{(1440)}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$ 0.035 TO 0.055 $(\approx 0.045 )$ GeV${}^{−1/2}$

${{\mathit N}{(1440)}}$ DECAY MODES
The following branching fractions are our estimates, not fits or averages.
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit N}}{{\mathit \pi}}$ $(55 - 75) \%$ 398   $\Gamma_{2}$ ${{\mathit N}}{{\mathit \eta}}$ < 1 $\%$ -1   $\Gamma_{3}$ ${{\mathit N}}{{\mathit \pi}}{{\mathit \pi}}$ $(17 - 50) \%$ 347   $\Gamma_{4}$ ${{\mathit \Delta}{(1232)}}{{\mathit \pi}}$ , ${\mathit P}{\mathrm -wave}$ $(6 - 27) \%$ 147   $\Gamma_{5}$ ${{\mathit N}}{{\mathit \sigma}}$ $(11 - 23) \%$     $\Gamma_{6}$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity=1/2 $(0.035 - 0.048) \%$ 414   $\Gamma_{7}$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity=1/2 $(0.02 - 0.04) \%$ 413