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

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VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 250\text{ to }600 }$ OUR ESTIMATE $380$ $\pm80$ 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. • • $422.01$ $\pm2.10$ $\pm12.72$ 894k AAIJ 2018 AI LHCB ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{\mp}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\mp}}$ $430$ $\pm24$ $\pm31$ 2 DARGENT 2017 RVUE ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ $367$ $\pm9$ ${}^{+28}_{-25}$ 420k 3 ALEKSEEV 2010 COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$ $410$ $\pm31$ $\pm30$ 4 AUBERT 2007 AU BABR 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \rho}^{0}}{{\mathit \rho}^{\pm}}{{\mathit \pi}^{\mp}}{{\mathit \gamma}}$ $\text{520 - 680}$ 6360 5 LINK 2007 A FOCS ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ $480$ $\pm20$ 6 GOMEZ-DUMM 2004 RVUE ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}_{{{\tau}}}}$ $580$ $\pm41$ 90k SALVINI 2004 OBLX ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$ $460$ $\pm85$ 205 7 DRUTSKOY 2002 BELL ${{\mathit B}}$ ${}^{(*)}$ ${{\mathit K}^{-}}$ ${{\mathit K}^{*0}}$ $814$ $\pm36$ $\pm13$ 37k 8 ASNER 2000 CLE2 $10.6$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$, ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$ $450$ $\pm50$ 22k 9 AKHMETSHIN 1999 E CMD2 $1.05 - 1.38$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $570$ $\pm10$ 10 BONDAR 1999 RVUE ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 4 ${{\mathit \pi}}$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}_{{{\tau}}}}$ $587$ $\pm27$ $\pm21$ 5904 11 ABREU 1998 G DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $478$ $\pm3$ $\pm15$ 5904 12 ABREU 1998 G DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $425$ $\pm14$ $\pm8$ 5904 13, 14 ABREU 1998 G DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $400$ $\pm35$ BARBERIS 1998 B 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}_{{{s}}}}$ $621$ $\pm32$ $\pm58$ 11, 15 ACKERSTAFF 1997 R OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$ $457$ $\pm15$ $\pm17$ 12, 15 ACKERSTAFF 1997 R OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$ $446$ $\pm21$ ${}^{+140}_{-0}$ 12 ALBRECHT 1993 C ARG ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $239$ $\pm11$ ANDO 1992 SPEC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$ $266$ $\pm13$ $\pm4$ 16 ANDO 1992 SPEC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$ $465$ ${}^{+228}_{-143}$ 17 IVANOV 1991 RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $298$ ${}^{+40}_{-34}$ 18 IVANOV 1991 RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $488$ $\pm32$ 19 IVANOV 1991 RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $430$ $\pm50$ ARMSTRONG 1990 OMEG 300.0${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $420$ $\pm40$ 20 ISGUR 1989 RVUE ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $396$ $\pm43$ 21 BOWLER 1988 RVUE $405$ $\pm75$ $\pm25$ BAND 1987 MAC ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $419$ $\pm108$ $\pm57$ BAND 1987 MAC ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \nu}}$ $521$ $\pm27$ ALBRECHT 1986 B ARG ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $476$ ${}^{+132}_{-120}$ $\pm54$ RUCKSTUHL 1986 DLCO ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $462$ $\pm56$ $\pm30$ SCHMIDKE 1986 MRK2 ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $292$ $\pm40$ BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $380$ $\pm100$ 22 DANKOWYCH 1981 SPEC 8.45 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$3 ${{\mathit \pi}}$ $300$ $\pm50$ 22 DAUM 1981 B CNTR 63,94 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$3 ${{\mathit \pi}}$ $230$ $\pm50$ 23 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 of the ${{\mathit K}^{-}}{{\mathit K}^{*0}}$ distribution assuming ${\mathit m}_{{{\mathit a}_{{{1}}}}}$= 1230 MeV and purely resonant production of the ${{\mathit K}^{-}}{{\mathit K}^{*0}}$ system. 8  From a fit to the 3${{\mathit \pi}}$ mass spectrum including the ${{\mathit K}}{{\overline{\mathit K}}^{*}{(892)}}$ threshold. 9  Using the ${{\mathit a}_{{{1}}}{(1260)}}$ mass of 1230 MeV. 10  From AKHMETSHIN 1999E and ASNER 2000 data using the ${{\mathit a}_{{{1}}}{(1260)}}$ mass of 1230 MeV. 11  Uses the model of KUHN 1990. 12  Uses the model of ISGUR 1989. 13  Includes the effect of a possible ${{\mathit a}_{{{1}}}^{\,'}}$ state. 14  Uses the model of FEINDT 1990. 15  Supersedes AKERS 1995P. 16  Average and spread of values using 2 variants of the model of BOWLER 1975. 17  Reanalysis of RUCKSTUHL 1986. 18  Reanalysis of SCHMIDKE 1986. 19  Reanalysis of ALBRECHT 1986B. 20  From a combined reanalysis of ALBRECHT 1986B, SCHMIDKE 1986, and RUCKSTUHL 1986. 21  From a combined reanalysis of ALBRECHT 1986B and DAUM 1981B. 22  Uses the model of BOWLER 1975. 23  Produced in ${{\mathit K}^{-}}$ backward scattering.

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