± 6

a0(980)

IG(JPC)=1−(0++)

Seeourminireviewonscalarmesonsunderf0(1370).(Seetheindexforthepagenumber.)

983.4±0.9OURAVERAGEIncludesdatafromthe2datablocksthatfollowthisone.

ηπFINALSTATEONLY

VALUE(MeV)

EVTS

DOCUMENTID

TECN

CHG

COMMENT

982±2

1AMSLER

pp→ωηπ0

92CBAR

0.0

pp→7π

•••Wedonotusethefollowingdataforaverages,fits,limits,etc.•••987

TORNQVIST

96RVUE

ππ→ππ,Kηπ

4.5π−p→pX−12–15π−p→nη2π3.1–6K−p→Λη2π4–5K−p→Λη2π2.7π+d

4.5K−N→ηπΛ5.5K−p→Λη2π

K,Kπ,

980±1147CONFORTO978±1650CORDEN989±470WELLS970±1520BARNES980±10CAMPBELL980±1015MILLER980±1030AMMAR1FromasingleBreit-Wignerfit.2Fromf(1285)decay.

1

78787569C6969B68OSPKOMEGHBCHBCDBCHBCHBC−±−−±−±

KKONLY

VALUE(MeV)

EVTS

DOCUMENTID

TECN

CHG

COMMENT

982±3

3ABELE

98CBAR0.0

pp→f1(1285)ω

•••Wedonotusethefollowingdataforaverages,fits,limits,etc.•••

4ASTIER1016±1010067HBC±0.0

ReviewofParticlePhysics:C.Casoetal.(ParticleDataGroup),EuropeanPhysicalJournalC3,1(1998)

3T-matrixpoleonsheetII,thepoleonsheetIIIisat1006-i49MeV.

a0(980)WIDTH

VALUE(MeV)

EVTS

DOCUMENTID

TECN

CHG

COMMENT

202JANSSEN6AMSLER

95RVUE

ηπ

ηπ→ηπ,K

K,Kπ,

pp→ωηπ0

92CBAR

0.0

54±10

406080±15±30±30

1530

CAMPBELLMILLERAMMAR69DBC69BHBC68HBC±−±

pp→7π2.7π+d

4.5K−N→ηπΛ5.5K−p→Λη2π

6FromasingleBreit-Wignerfit.7Fromf(1285)decay.

1

8Usingatwo-channelresonanceparametrizationofGAY76Bdata.

KKONLY

VALUE(MeV)

EVTS

DOCUMENTID

TECN

CHG

COMMENT

92±8

9ABELE

98CBAR0.0

10ASTIER67includesdataofBARLOW67,CONFORTO67,ARMENTEROS65.11Plussystematicerrors.

ReviewofParticlePhysics:C.Casoetal.(ParticleDataGroup),EuropeanPhysicalJournalC3,1(1998)

a0(980)DECAYMODES

Mode

Fraction(Γi/Γ)seenseen

Γ3Γ4Γ5

Kρπγγe+e−

󰀂󰀁󰀂󰀁

ΓKK/Γηπ

VALUE

a0(980)BRANCHINGRATIOS

Γ2/Γ1

DOCUMENTID

TECN

CHG

COMMENT

•••Wedonotusethefollowingdataforaverages,fits,limits,etc.•••

13BUGG1.16±0.1894RVUE

pp→

±∓K0LKπ

p→7π

12Usingπ0π0ηfromAMSLER94D.

•••Wedonotusethefollowingdataforaverages,fits,limits,etc.•••<0.25

70

AMMAR

70HBC

±

4.1,5.5K−p→Λη2π

ReviewofParticlePhysics:C.Casoetal.(ParticleDataGroup),EuropeanPhysicalJournalC3,1(1998)

a0(980)REFERENCES

ABELE

TORNQVISTJANSSENAMSLERAMSLERBUGGAMSLER

ARMSTRONGOEST

VOROBYEV

98969594C94D949291B9088

PRD573860A.Abele,Adomeit,Amsler+(CrystalBarrelCollab.)PRL761575+Roos(HELS)PRD522690+Pearce,Holinde,Speth(STON,ADLD,JULI)PLB327425+Armstrong,Ravndal+(CrystalBarrelCollab.)PLB333277+Anisovich,Spanier+(CrystalBarrelCollab.)PRD504412+Anisovich+(LOQM)PLB291347+Augustin,Baker+(CrystalBarrelCollab.)ZPHYC52389+Barnes+(ATHU,BARI,BIRM,CERN,CDEF)ZPHYC47343+Olsson+(JADECollab.)SJNP48273+Golubev,Dolinsky,Druzhinin+(NOVO)TranslatedfromYAF48436.PRD331847+Aschman,Besset,Bienlein+(CrystalBallCollab.)PL138B459+(BONN,CERN,GLAS,LANC,MCHS,CURIN+)NPB178197+(BARI,BONN,CERN,DARE,LIVP+)NPB1761+Briand,Duboc,Levy+(CURIN,LAUS,NEUC,GLAS)NPB151181+Gavillet,Blokzijl+(CERN,ZEEM,NIJM,OXF)LNC23419+Conforto,Key+(RHEL,TNTO,CHIC,FNAL+)NPB144253+Corbett,Alexander+(BIRM,RHEL,TELA,LOWC)NPB121189+(AACH3,BERL,BONN,CERN,CRAC,HEIDH+)PL63B224(CERN)PL63B220+Chaloupka,Blokzijl,Heinen+(CERN,AMST,NIJM)JPNPB101333+Radojicic,Roscoe,Lyons(OXF)NPB44125+Nascimento,Bizzarri+(CDEF,CERN)PRD2430+Kropac,Davis+(KANS,NWES,ANL,WISC)PRL23610+Chung,Eisner,Bassano,Goldberg+(BNL,SYRA)PRL221204+Lichtman,Loeffler+(PURD)PL29B255+Kramer,Carmony+(PURD)PR1882011Yen,Ammann,Carmony,Elsner+(PURD)PRL211832+Davis,Kropac,Derrick,Fields+(NWES,ANL)PL25B294+Montanet,Baubillier,Duboc+(CDEF,CERN,IRAD)BARLOW67,CONFORTO67,andARMENTEROS65.NC50A701+Lillestol,Montanet+(CERN,CDEF,IRAD,LIVP)NPB3469+Marechal+(CERN,CDEF,IPNP,LIVP)PL17344+Edwards,Jacobsen+(CERN,CDEF)OxfordConf.58(LRL)

ANTREASYAN86

ATKINSON84EEVANGELISTA81DEBILLY80GURTU79CONFORTO78CORDEN78GRASSLER77FLATTE76GAY76BWELLS75DEFOIX72AMMAR70BARNES69CCAMPBELL69MILLER69B

Also69AMMAR68ASTIER67

IncludesdataofBARLOW67CONFORTO67ARMENTEROS65ROSENFELD65

ACHASOVACHASOVAMSLERTORNQVISTWEINSTEINACHASOVWEINSTEINTORNQVISTBRAMONTURKOT97C97D94D908988B83B828063PRD564084PRD56203PLB333277NPBPS21196UTPT8903ZPHYC41309PRD27588PRL49624PL93B65

SienaConf.1661

N.N.Achasov+N.N.Achasov++Anisovich,Spanier++Isgur

+Shestakov+Isgur

+Masso

+Collins,Fujii,Kemp+

(CrystalBarrelCollab.)

(HELS)(TNTO)(NOVM)(TNTO)(HELS)(BARC)(BNL,PITT)