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${{\mathit \rho}{(770)}}$ MASS

We no longer list ${\mathit S}{\mathrm -wave}$ Breit-Wigner fits, or data with high combinatorial background.

NEUTRAL ONLY, PHOTOPRODUCED

INSPIRE   PDGID:

M009M0P

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 769.2 \pm0.9}$ OUR AVERAGE $770.8$ $\pm1.3$ ${}^{+2.3}_{-2.4}$ 900k ANDREEV 2020 H1 ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $771$ $\pm2$ ${}^{+2}_{-1}$ 63.5k 1 ABRAMOWICZ 2012 ZEUS ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $770$ $\pm2$ $\pm1$ 79k 2 BREITWEG 1998 B ZEUS $50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$ $767.6$ $\pm2.7$ BARTALUCCI 1978 CNTR ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit p}}$ $775$ $\pm5$ GLADDING 1973 CNTR 2.9$-$4.7 ${{\mathit \gamma}}{{\mathit p}}$ $767$ $\pm4$ 1930 BALLAM 1972 HBC 2.8 ${{\mathit \gamma}}{{\mathit p}}$ $770$ $\pm4$ 2430 BALLAM 1972 HBC 4.7 ${{\mathit \gamma}}{{\mathit p}}$ $765$ $\pm10$ ALVENSLEBEN 1970 CNTR ${{\mathit \gamma}}{}^{}\mathrm {A}$, $\mathit t$ $<$0.01 $767.7$ $\pm1.9$ 140k BIGGS 1970 CNTR $<$4.1 ${{\mathit \gamma}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{}^{}\mathrm {C}$ $765$ $\pm5$ 4000 ASBURY 1967 B CNTR ${{\mathit \gamma}}{+}$ ${}^{}\mathrm {Pb}$ • • We do not use the following data for averages, fits, limits, etc. • • $771$ $\pm2$ 79k 3 BREITWEG 1998 B ZEUS $50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$ 1  Using the KUHN 1990 parametrization of the pion form factor, neglecting ${{\mathit \rho}}−{{\mathit \omega}}$ interference. 2  From the parametrization according to SOEDING 1966. 3  From the parametrization according to ROSS 1966.

References

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