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

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

References:

AAIJ 2018AI EPJ C78 443 Studies of the resonance structure in $D^{0} \rightarrow K^\mp \pi ^\pm \pi ^\pm \pi ^\mp $ decays AGHASYAN 2018B PR D98 092003 Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$ DARGENT 2017 JHEP 1705 143 Amplitude Analyses of ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ and ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Decays ALEKSEEV 2010 PRL 104 241803 Observation of a $\mathit J{}^{PC} = 1-+$ Exotic Resonance in Diffractive Dissociation of 190 GeV/$\mathit c$ ${{\mathit \pi}^{-}}$ into ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ AUBERT 2007AU PR D76 092005 The ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) ${{\mathit \pi}^{0}}$ , 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) ${{\mathit \eta}}$ , ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ and ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$ Cross Sections Measured with Initial-State Radiation Also PR D77 119902E (errat.) Erratum: The ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) ${{\mathit \pi}^{0}}$ , 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) ${{\mathit \eta}}$ , ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ and ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$ Cross Sections Measured with Initial-State Radiation [Phys. Rev. D 76, 092005 (2007)] LINK 2007A PR D75 052003 Study of the ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ Decay GOMEZ-DUMM 2004 PR D69 073002 ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}{{\mathit \pi}}{{\mathit \nu}_{{\tau}}}$ Decays in the Resonance Effective Theory SALVINI 2004 EPJ C35 21 ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation into Four Charged Pions at Rest and in Flight ASNER 2000 PR D61 012002 Hadronic Structure in the Decay ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \nu}_{{\tau}}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ and the Sign of the ${{\mathit \nu}_{{\tau}}}$ Helicity ABREU 1998G PL B426 411 A Study of the Hadronic Resonance Structure in the Decay ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}_{{\tau}}}$ BARBERIS 1998B PL B422 399 A Study of the Centrally Produced ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Channel in ${{\mathit p}}{{\mathit p}}$ Interactions at 450 ${\mathrm {GeV/}}\mathit c$ ACKERSTAFF 1997R ZPHY C75 593 A Measurement of the Hadronic Decay Current and the ${{\mathit \nu}_{{\tau}}}$ Helicity in ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \nu}_{{\tau}}}$ ALBRECHT 1993C ZPHY C58 61 Analysis of the Decay ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \nu}_{{\tau}}}$ and Determination of the ${{\mathit a}_{{1}}{(1260)}}$ Resonance Parameters ANDO 1992 PL B291 496 Experimental Study of the Axial-Vector Resonances of ${{\mathit a}_{{1}}}$ and ${{\mathit h}_{{1}}}$ in the ${{\mathit \pi}^{-}}{{\mathit p}}$ Charge Exchange Reaction IVANOV 1991 ZPHY C49 563 The Decay ${{\mathit \tau}}$ $\rightarrow$ 3 ${{\mathit \pi}}{{\mathit \nu}_{{\tau}}}$ and Characteristics of ${{\mathit a}_{{1}}}$ Meson ARMSTRONG 1990 ZPHY C48 213 A Study of the Centrally Produced ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ System Formed in the Reaction ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$) ${{\mathit p}_{{s}}}$ at 300 ${\mathrm {GeV/}}\mathit c$ ISGUR 1989 PR D39 1357 The ${{\mathit a}_{{1}}}$ in ${{\mathit \tau}}$ Decay BOWLER 1988 PL B209 99 The Parameters of the ${{\mathit a}_{{1}}}$ Meson BAND 1987 PL B198 297 Measurements of ${{\mathit \tau}}$ Decays to Three Pions TORNQVIST 1987 ZPHY C36 695 The ${{\mathit a}_{{1}}}$ Mass from ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit a}_{{1}}}$ Decay ALBRECHT 1986B ZPHY C33 7 Measurement of ${{\mathit \tau}}$ Decays into Three Charged Pions RUCKSTUHL 1986 PRL 56 2132 Study of Three Prong ${{\mathit \tau}}$ Decays and Determination of the $\mathit A_{1}$ Parameters SCHMIDKE 1986 PRL 57 527 Study of the Decay ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \nu}_{{\tau}}}$ BELLINI 1985 SJNP 41 781 $2{}^{-}{}^{}$ Resonances in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ Systems DANKOWYCH 1981 PRL 46 580 Evidence for $\mathit I = 1$ (${{\mathit A}_{{1}}}$) and $\mathit I = 0$ (${{\mathit H}}$) Axial Vector Resonances in Charge Exchange DAUM 1981B NP B182 269 Diffractive Production of 3${{\mathit \pi}}$ States at 63 and 94 GeV GAVILLET 1977 PL 69B 119 Backward Production of a Spin Parity $1{}^{+}{}^{}{{\mathit \rho}}{{\mathit \pi}}$ Enhancement at 1.04 GeV