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${{\mathit a}_{{{1}}}{(1260)}}$ MASS

INSPIRE   PDGID:

M010M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1230 \pm40}$ OUR ESTIMATE $1299$ ${}^{+12}_{-28}$ 46M 1 AGHASYAN 2018 B COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1195.05$ $\pm1.05$ $\pm6.33$ 894k AAIJ 2018 AI LHCB ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{\mp}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\mp}}$ $1225$ $\pm9$ $\pm20$ 7k 2 DARGENT 2017 RVUE ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ $1255$ $\pm6$ ${}^{+7}_{-17}$ 420k 3 ALEKSEEV 2010 COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$ $1243$ $\pm12$ $\pm20$ 4 AUBERT 2007 AU BABR 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \rho}^{0}}{{\mathit \rho}^{\pm}}{{\mathit \pi}^{\mp}}{{\mathit \gamma}}$ $\text{1230 - 1270}$ 6360 5 LINK 2007 A FOCS ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ $1203$ $\pm3$ 6 GOMEZ-DUMM 2004 RVUE ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}_{{{\tau}}}}$ $1330$ $\pm24$ 90k SALVINI 2004 OBLX ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$ $1331$ $\pm10$ $\pm3$ 37k 7 ASNER 2000 CLE2 $10.6$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$, ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$ $1255$ $\pm7$ $\pm6$ 5904 8 ABREU 1998 G DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $1207$ $\pm5$ $\pm8$ 5904 9 ABREU 1998 G DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $1196$ $\pm4$ $\pm5$ 5904 10, 11 ABREU 1998 G DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $1240$ $\pm10$ BARBERIS 1998 B 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}_{{{s}}}}$ $1262$ $\pm9$ $\pm7$ 8, 12 ACKERSTAFF 1997 R OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$ $1210$ $\pm7$ $\pm2$ 9, 12 ACKERSTAFF 1997 R OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$ $1211$ $\pm7$ ${}^{+50}_{-0}$ 9 ALBRECHT 1993 C ARG ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1121$ $\pm8$ 13 ANDO 1992 SPEC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$ $1242$ $\pm37$ 14 IVANOV 1991 RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1260$ $\pm14$ 15 IVANOV 1991 RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1250$ $\pm9$ 16 IVANOV 1991 RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1208$ $\pm15$ ARMSTRONG 1990 OMEG 300.0 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $1220$ $\pm15$ 17 ISGUR 1989 RVUE ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1260$ $\pm25$ 18 BOWLER 1988 RVUE $1166$ $\pm18$ $\pm11$ BAND 1987 MAC ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1164$ $\pm41$ $\pm23$ BAND 1987 MAC ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \nu}}$ $1250$ $\pm40$ 17 TORNQVIST 1987 RVUE $1046$ $\pm11$ ALBRECHT 1986 B ARG ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1056$ $\pm20$ $\pm15$ RUCKSTUHL 1986 DLCO ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1194$ $\pm14$ $\pm10$ SCHMIDKE 1986 MRK2 ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $1255$ $\pm23$ BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $1240$ $\pm80$ 19 DANKOWYCH 1981 SPEC 8.45 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$3 ${{\mathit \pi}}$ $1280$ $\pm30$ 19 DAUM 1981 B CNTR 63,94 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$3 ${{\mathit \pi}}$ $1041$ $\pm13$ 20 GAVILLET 1977 HBC 4.2 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Sigma}}$3 ${{\mathit \pi}}$ 1  Statistical error negligible. 2  Reanalysis of CLEO data using Breit-Wigner parameterization. 3  Superseded by AGHASYAN 2018B. 4  The ${{\mathit \rho}^{\pm}}{{\mathit \pi}^{\mp}}$ state can be also due to the ${{\mathit \pi}{(1300)}}$. 5  Using the Breit-Wigner parameterization; strong correlation between mass and width. 6  Using the data of BARATE 1998R. 7  From a fit to the 3${{\mathit \pi}}$ mass spectrum including the ${{\mathit K}}{{\overline{\mathit K}}^{*}{(892)}}$ threshold. 8  Uses the model of KUHN 1990. 9  Uses the model of ISGUR 1989. 10  Includes the effect of a possible ${{\mathit a}_{{{1}}}^{\,'}}$ state. 11  Uses the model of FEINDT 1990. 12  Supersedes AKERS 1995P. 13  Average and spread of values using 2 variants of the model of BOWLER 1975. 14  Reanalysis of RUCKSTUHL 1986. 15  Reanalysis of SCHMIDKE 1986. 16  Reanalysis of ALBRECHT 1986B. 17  From a combined reanalysis of ALBRECHT 1986B, SCHMIDKE 1986, and RUCKSTUHL 1986. 18  From a combined reanalysis of ALBRECHT 1986B and DAUM 1981B. 19  Uses the model of BOWLER 1975. 20  Produced in ${{\mathit K}^{-}}$ backward scattering.

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