pdgLive Home   >   LIGHT UNFLAVORED MESONS ($\mathit S$ = $\mathit C$ = $\mathit B$ = 0)   >   ${{\mathit a}_{{{1}}}{(1260)}}$   >   ${{\mathit a}_{{{1}}}{(1260)}}$ WIDTH

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

INSPIRE   JSON  (beta) PDGID:

M010W

M010W VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 250\text{ to }600 }$ OUR ESTIMATE $\bf{ 422 \pm12}$ OUR AVERAGE $422.01$ $\pm2.10$ $\pm12.72$ 894k 1 AAIJ 2018 AI   LHCB ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{\mp}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\mp}}$ $380$ $\pm80$ 46M 2, 3 AGHASYAN 2018 B   COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $430$ $\pm24$ $\pm31$ 1, 4 DARGENT 2017   RVUE ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ • • We do not use the following data for averages, fits, limits, etc. • • $367$ $\pm9$ ${}^{+28}_{-25}$ 420k 5 ALEKSEEV 2010   COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$ $410$ $\pm31$ $\pm30$ 6 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 7 LINK 2007 A   FOCS ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ $480$ $\pm20$ 8 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 9 DRUTSKOY 2002   BELL ${{\mathit B}}$ ${}^{(*)}$ ${{\mathit K}^{-}}$ ${{\mathit K}^{*0}}$ $814$ $\pm36$ $\pm13$ 37k 10 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 11 AKHMETSHIN 1999 E   CMD2 $1.05 - 1.38$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $570$ $\pm10$ 12 BONDAR 1999   RVUE ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 4 ${{\mathit \pi}}$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}_{{{\tau}}}}$ $587$ $\pm27$ $\pm21$ 5904 13 ABREU 1998 G   DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $478$ $\pm3$ $\pm15$ 5904 14 ABREU 1998 G   DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $425$ $\pm14$ $\pm8$ 5904 15, 16 ABREU 1998 G   DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $400$ $\pm35$ BARBERIS 1998 B   450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}_{{{s}}}}$ $621$ $\pm32$ $\pm58$ 13, 17 ACKERSTAFF 1997 R   OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$ $457$ $\pm15$ $\pm17$ 14, 17 ACKERSTAFF 1997 R   OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$ $446$ $\pm21$ ${}^{+140}_{-0}$ 14 ALBRECHT 1993 C   ARG ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $239$ $\pm11$ ANDO 1992   SPEC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$ $266$ $\pm13$ $\pm4$ 18 ANDO 1992   SPEC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$ $465$ ${}^{+228}_{-143}$ 19 IVANOV 1991   RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $298$ ${}^{+40}_{-34}$ 20 IVANOV 1991   RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $488$ $\pm32$ 21 IVANOV 1991   RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $430$ $\pm50$ ARMSTRONG 1990   OMEG 300.0${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $420$ $\pm40$ 22 ISGUR 1989   RVUE ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$ $396$ $\pm43$ 23 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 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ $380$ $\pm100$ 24 DANKOWYCH 1981   SPEC 8.45 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$3 ${{\mathit \pi}}$ $300$ $\pm50$ 24 DAUM 1981 B   CNTR 63,94 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$3 ${{\mathit \pi}}$ $230$ $\pm50$ 25 GAVILLET 1977   HBC 4.2 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Sigma}}$3 ${{\mathit \pi}}$ 1  Using Breit--Wigner functions and the covariant tensor formalism with exponential form factors, including the symmetrized $f_0\pi$ and $\rho\pi$ channels, as well as their interference. 2  Statistical error negligible. 3  Using Breit--Wigner functions and the helicity formalism with BlattWeisskopf form factors, including the symmetrized $\rho\pi$ channel. 4  Reanalysis of CLEO data using Breit-Wigner parameterization. 5  Superseded by AGHASYAN 2018B. 6  The ${{\mathit \rho}^{\pm}}{{\mathit \pi}^{\mp}}$ state can be also due to the ${{\mathit \pi}{(1300)}}$. 7  Using the Breit-Wigner parameterization; strong correlation between mass and width. 8  Using the data of BARATE 1998R. 9  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. 10  From a fit to the 3${{\mathit \pi}}$ mass spectrum including the ${{\mathit K}}{{\overline{\mathit K}}^{*}{(892)}}$ threshold. 11  Using the ${{\mathit a}_{{{1}}}{(1260)}}$ mass of 1230 MeV. 12  From AKHMETSHIN 1999E and ASNER 2000 data using the ${{\mathit a}_{{{1}}}{(1260)}}$ mass of 1230 MeV. 13  Uses the model of KUHN 1990. 14  Uses the model of ISGUR 1989. 15  Includes the effect of a possible ${{\mathit a}_{{{1}}}^{\,'}}$ state. 16  Uses the model of FEINDT 1990. 17  Supersedes AKERS 1995P. 18  Average and spread of values using 2 variants of the model of BOWLER 1975. 19  Reanalysis of RUCKSTUHL 1986. 20  Reanalysis of SCHMIDKE 1986. 21  Reanalysis of ALBRECHT 1986B. 22  From a combined reanalysis of ALBRECHT 1986B, SCHMIDKE 1986, and RUCKSTUHL 1986. 23  From a combined reanalysis of ALBRECHT 1986B and DAUM 1981B. 24  Uses the model of BOWLER 1975. 25  Produced in ${{\mathit K}^{-}}$ backward scattering.

References