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

INSPIRE   JSON  (beta) PDGID:
M010M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 1230 \pm40}$ OUR ESTIMATE
$1299$ ${}^{+12}_{-28}$ 46M 1
AGHASYAN
01B
 
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
01AI
 
LHCB ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{\mp}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\pm}}{{\mathit \pi}^{\mp}}$
$1225$ $\pm9$ $\pm20$ 7k 2
DARGENT
01
 
RVUE ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$
$1255$ $\pm6$ ${}^{+7}_{-17}$ 420k 3
ALEKSEEV
01
 
COMP 190 ${{\mathit \pi}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit P}}{{\mathit b}^{\,'}}$
$1243$ $\pm12$ $\pm20$ 4
AUBERT
00AU
 
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
00A
 
FOCS ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$
$1203$ $\pm3$ 6
GOMEZ-DUMM
00
 
RVUE ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}_{{{\tau}}}}$
$1330$ $\pm24$ 90k
SALVINI
00
 
OBLX ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$
$1331$ $\pm10$ $\pm3$ 37k 7
ASNER
00
 
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
99G
 
DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$1207$ $\pm5$ $\pm8$ 5904 9
ABREU
99G
 
DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$1196$ $\pm4$ $\pm5$ 5904 10, 11
ABREU
99G
 
DLPH ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$1240$ $\pm10$
BARBERIS
99B
 
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
99R
 
OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$
$1210$ $\pm7$ $\pm2$ 9, 12
ACKERSTAFF
99R
 
OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $88 - 94$, ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}}$
$1211$ $\pm7$ ${}^{+50}_{-0}$ 9
ALBRECHT
99C
 
ARG ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1121$ $\pm8$ 13
ANDO
99
 
SPEC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$
$1242$ $\pm37$ 14
IVANOV
99
 
RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1260$ $\pm14$ 15
IVANOV
99
 
RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1250$ $\pm9$ 16
IVANOV
99
 
RVUE ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1208$ $\pm15$
ARMSTRONG
99
 
OMEG 300.0${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$1220$ $\pm15$ 17
ISGUR
98
 
RVUE ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1260$ $\pm25$ 18
BOWLER
98
 
RVUE
$1166$ $\pm18$ $\pm11$
BAND
98
 
MAC ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1164$ $\pm41$ $\pm23$
BAND
98
 
MAC ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \nu}}$
$1250$ $\pm40$ 17
TORNQVIST
98
 
RVUE
$1046$ $\pm11$
ALBRECHT
98B
 
ARG ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1056$ $\pm20$ $\pm15$
RUCKSTUHL
98
 
DLCO ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1194$ $\pm14$ $\pm10$
SCHMIDKE
98
 
MRK2 ${{\mathit \tau}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}}$
$1255$ $\pm23$
BELLINI
98
 
SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$
$1240$ $\pm80$ 19
DANKOWYCH
98
 
SPEC 8.45 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$3 ${{\mathit \pi}}$
$1280$ $\pm30$ 19
DAUM
98B
 
CNTR 63,94 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$3 ${{\mathit \pi}}$
$1041$ $\pm13$ 20
GAVILLET
97
 
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.
References