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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   JSON  (beta) PDGID:

M009M0P

M009M0P VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 769.6 \pm0.8}$ OUR AVERAGE $774$ $\pm3$ 1 AAIJ 2025 AG   LHCB 5 TeV ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ $\rightarrow$ ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $769.5$ $\pm1.2$ $\pm2.0$ 2 ACHARYA 2020 F   ALCE 5 TeV ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ $\rightarrow$ ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $770.8$ $\pm1.3$ ${}^{+2.3}_{-2.4}$ 900k ANDREEV 2020   H1 ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $771$ $\pm2$ ${}^{+2}_{-1}$ 63.5k 3 ABRAMOWICZ 2012   ZEUS ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $770$ $\pm2$ $\pm1$ 79k 4 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. • • $773$ $\pm1$ 5 SIRUNYAN 2019 CS   CMS 5 TeV ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ $\rightarrow$ ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $776.2$ $\pm0.6$ 384k 6 ADAMCZYK 2017 A   STAR ${}^{}\mathrm {Au}$ ${}^{}\mathrm {Au}$ $\rightarrow$ ${}^{}\mathrm {Au}$ ${}^{}\mathrm {Au}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $771$ $\pm2$ 79k 7 BREITWEG 1998 B   ZEUS $50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$ 1  Using the parametrisation as in ANDREEV 2020 with ${{\mathit \rho}}-{{\mathit \omega}}$ interference with the additional presence of two Breit-Wigner resonances for excited ${{\mathit \rho}}$ states. 2  From the parametrization according to SOEDING 1966 plus an additional constant term. 3  Using the KUHN 1990 parametrization of the pion form factor, neglecting ${{\mathit \rho}}−{{\mathit \omega}}$ interference. 4  From the parametrization according to SOEDING 1966. 5  Including interference with direct ${{\mathit \pi}}{{\mathit \pi}}$ production and ${{\mathit \rho}}-{{\mathit \omega}}$ interference, statistical error only. 6  From the parametrization according to SOEDING 1966 with an additional relativistic Breit-Wigner component to account for ${{\mathit \omega}}$ photoproduction. Systematic errors not evaluated. 7  From the parametrization according to ROSS 1966.

References

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