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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: B024

${{\mathit N}{(2120)}}$ $I(J^P)$ = $1/2(3/2^{-})$

Before the 2012 $\mathit Review$, all the evidence for a $\mathit J{}^{P} = 3/2{}^{-}$ state with a mass above 1800 MeV was filed under a two-star ${{\mathit N}{(2080)}}$. There is now evidence from ANISOVICH 2012A for two ${}^{}3/2{}^{-}$ states in this region, so we have split the older data (according to mass) between a three-star ${{\mathit N}{(1875)}}$ and a two-star ${{\mathit N}{(2120)}}$.

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▸  exp ${{\mathit N}{(2120)}}$ POLE POSITION

REAL PART 2050 TO 2150 $(\approx 2100 )$ MeV

$-2{\times }$IMAGINARY PART 200 TO 360 $(\approx 280 )$ MeV

▸  exp ${{\mathit N}{(2120)}}$ ELASTIC POLE RESIDUE

MODULUS $\vert \mathit r\vert $ 10 TO 30 $(\approx 20 )$ MeV

PHASE $\theta $ -40 TO 20 $(\approx -10 )$ $^\circ{}$

▸  exp ${{\mathit N}{(2120)}}$ INELASTIC POLE RESIDUE

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit K}}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit N}{(1535)}}{{\mathit \pi}}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit \Delta}{(1232)}}{{\mathit \pi}}$, ${\mathit S}{\mathrm -wave}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit \Delta}{(1232)}}{{\mathit \pi}}$, ${\mathit D}{\mathrm -wave}$

Normalized residue in ${{\mathit N}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \sigma}}$

${{\mathit N}{(2120)}}$ BREIT-WIGNER MASS 2060 TO 2160 $(\approx 2120 )$ MeV

${{\mathit N}{(2120)}}$ BREIT-WIGNER WIDTH 260 TO 360 $(\approx 300 )$ MeV

▸  exp ${{\mathit N}{(2120)}}$ PHOTON DECAY AMPLITUDES AT THE POLE

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity-3/2 amplitude A$_{3/2}$

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity-3/2 amplitude A$_{3/2}$

▸  exp ${{\mathit N}{(2120)}}$ BREIT-WIGNER PHOTON DECAY AMPLITUDES

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity-3/2 amplitude A$_{3/2}$

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

${{\mathit N}{(2120)}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity-3/2 amplitude A$_{3/2}$

${{\mathit N}{(2120)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit N}}{{\mathit \pi}}$ $(5 - 15) \%$ 846   $\Gamma_{2}$ ${{\mathit N}}{{\mathit \eta}}$ $(1 - 5) \%$ 743   $\Gamma_{3}$ ${{\mathit N}}{{\mathit \eta}^{\,'}}$ $(2 - 6) \%$ 474   $\Gamma_{4}$ ${{\mathit N}}{{\mathit \omega}}$ $(4 - 20) \%$ 617   $\Gamma_{5}$ ${{\mathit \Lambda}}{{\mathit K}}$ $(6 - 11) \%$ 660   $\Gamma_{6}$ ${{\mathit N}}{{\mathit \pi}}{{\mathit \pi}}$ >27 $\%$ 827   $\Gamma_{7}$ ${{\mathit \Delta}{(1232)}}{{\mathit \pi}}$ >23 $\%$ 693   $\Gamma_{8}$ ${{\mathit \Delta}{(1232)}}{{\mathit \pi}}$ , ${\mathit S}{\mathrm -wave}$ $(15 - 70) \%$ 693   $\Gamma_{9}$ ${{\mathit \Delta}{(1232)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$ $(8 - 45) \%$ 693   $\Gamma_{10}$ ${{\mathit N}}{{\mathit \rho}}$ , $\mathit S$=3/2 , ${\mathit S}{\mathrm -wave}$ < 3 $\%$ 622   $\Gamma_{11}$ ${{\mathit N}}{{\mathit \sigma}}$ $(4 - 15) \%$     $\Gamma_{12}$ ${{\mathit N}{(1535)}}{{\mathit \pi}}$ $(7 - 23) \%$ 494   $\Gamma_{13}$ ${{\mathit \Lambda}}{{\mathit K}^{*}{(892)}}$ < 0.2 $\%$ 339   $\Gamma_{14}$ ${{\mathit p}}{{\mathit \gamma}}$ $(0.16 - 2.1) \%$ 852   $\Gamma_{15}$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity=1/2 $(0.07 - 0.80) \%$ 852   $\Gamma_{16}$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity=3/2 $(0.09 - 1.3) \%$ 852   $\Gamma_{17}$ ${{\mathit n}}{{\mathit \gamma}}$ $(0.04 - 0.72) \%$ 852   $\Gamma_{18}$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity=1/2 $(0.04 - 0.60) \%$ 852   $\Gamma_{19}$ ${{\mathit n}}{{\mathit \gamma}}$ , helicity=3/2 $(0.001 - 0.12) \%$ 852