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

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

NEUTRAL ONLY, PHOTOPRODUCED

INSPIRE   JSON  (beta) PDGID:
M009W0P
M009W0P
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 152.3 \pm1.7}$ OUR AVERAGE
$148$ $\pm7$ 1
AAIJ
2025AG
 
LHCB 5 TeV ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ $\rightarrow$ ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$156$ $\pm2$ $\pm3$ 2
ACHARYA
2020F
 
ALCE 5 TeV ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ $\rightarrow$ ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$151.3$ $\pm2.2$ ${}^{+1.6}_{-2.8}$ 900k
ANDREEV
2020
 
H1 ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$155$ $\pm5$ $\pm2$ 63.5k 3
ABRAMOWICZ
2012
 
ZEUS ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$146$ $\pm3$ $\pm13$ 79k 4
BREITWEG
1998B
 
ZEUS $50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$
$150.9$ $\pm3.0$
BARTALUCCI
1978
 
CNTR ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit p}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$148$ $\pm3$ 5
SIRUNYAN
2019CS
 
CMS 5 TeV ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ $\rightarrow$ ${}^{}\mathrm {Pb}$ ${}^{}\mathrm {Pb}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$156$ $\pm1$ 384k 6
ADAMCZYK
2017A
 
STAR ${}^{}\mathrm {Au}$ ${}^{}\mathrm {Au}$ $\rightarrow$ ${}^{}\mathrm {Au}$ ${}^{}\mathrm {Au}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$138$ $\pm3$ 79k 7
BREITWEG
1998B
 
ZEUS $50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$
$147$ $\pm11$
GLADDING
1973
 
CNTR 2.9$-$4.7 ${{\mathit \gamma}}{{\mathit p}}$
$155$ $\pm12$ 2430
BALLAM
1972
 
HBC 4.7 ${{\mathit \gamma}}{{\mathit p}}$
$145$ $\pm13$ 1930
BALLAM
1972
 
HBC 2.8 ${{\mathit \gamma}}{{\mathit p}}$
$140$ $\pm5$
ALVENSLEBEN
1970
 
CNTR ${{\mathit \gamma}}{}^{}\mathrm {A}$, $\mathit t$ $<$0.01
$146.1$ $\pm2.9$ 140k
BIGGS
1970
 
CNTR $<$4.1 ${{\mathit \gamma}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{}^{}\mathrm {C}$
$160$ $\pm10$
LANZEROTTI
1968
 
CNTR ${{\mathit \gamma}}{{\mathit p}}$
$130$ $\pm5$ 4000
ASBURY
1967B
 
CNTR ${{\mathit \gamma}}{+}$ ${}^{}\mathrm {Pb}$
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