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

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

NEUTRAL ONLY, PHOTOPRODUCED INSPIRE search

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:
AAIJ 2025AG
JHEP 2511 103 Coherent photoproduction of $\rho^0, \omega$ and excited vector mesons in ultraperipheral PbPb collisions
ACHARYA 2020F
JHEP 2006 035 Coherent photoproduction of $\rho^{0}$ vector mesons in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV
ANDREEV 2020
EPJ C80 1189 Measurement of exclusive $\pi^+ \pi ^-$ and $\rho^0$ meson photoproduction at HERA
SIRUNYAN 2019CS
EPJ C79 702 Measurement of exclusive $\rho^0$(770) photoproduction in ultraperipheral pPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV
ADAMCZYK 2017A
PR C96 054904 Coherent diffractive photoproduction of $\rho^{0}$ mesons on gold nuclei at RHIC
ABRAMOWICZ 2012
EPJ C72 1869 Exclusive Electroproduction of Two Pions at HERA
BREITWEG 1998B
EPJ C2 247 Measurement of Elastic ${{\mathit \rho}^{0}}$ Photoproduction at HERA
BARTALUCCI 1978
NC 44A 587 Measurement of the Photoproduction Phases of the ${{\mathit \rho}}$, ${{\mathit \omega}}$, and ${{\mathit \phi}}$ Mesons
GLADDING 1973
PR D8 3721 Measurement of Photoproduction of ${{\mathit \omega}}$ and ${{\mathit \rho}{(770)}^{0}}$ Mesons in Hydrogen
BALLAM 1972
PR D5 545 Bubble Chamber Study of Photoproduction by 2.8 and 4.7 GeV Polarized Photons. I. Cross Section Determinations and Production of ${{\mathit \rho}{(770)}^{0}}$ and ${{\mathit \Delta}{(1232)}}$ in the Reaction of ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
ALVENSLEBEN 1970
PRL 24 786 Photoproduction of Neutral ${{\mathit \rho}}$ Mesons from Complex Nuclei
BIGGS 1970
PRL 24 1197 Observation of ${{\mathit \rho}}$ ${{\mathit \omega}}$ Interference in the Photoproduction of Electron Positron Pairs from Carbon and a Measurement of the ${{\mathit \rho}}$ $−$ ${{\mathit \omega}}$ Phase
LANZEROTTI 1968
PR 166 1365 Photoproduction of Neutral ${{\mathit \rho}}$ Mesons
ASBURY 1967B
PRL 19 865 High Energy Photoproduction of Neutral ${{\mathit \rho}{(770)}^{0}}$ Mesons on Complex Nuclei