Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) LIGHT UNFLAVORED MESONS (S = C = B = 0) p For I = 1 (�, b, �, a): ud, (uu−dd)/ 2, du; 0 0 0 for I = 0 (�, � , h, h , !, �, f , f ): c1(uu + d d) + c2(s s) �� IG (JP) = 1−(0−) Mass m = 139:57018 � 0:00035 MeV (S = 1.2) −8 Mean life � = (2:6033 � 0:0005) � 10 s (S = 1.2) c� = 7:8045 m �� ! ‘��γ form factors [a] FV = 0:017 � 0:008 FA = 0:0116 � 0:0016 (S = 1.3) +0:009 R = 0:059−0:008 �− modes are charge conjugates of the modes below. For decay limits to particles which are not established, see the appropriate Search setions (Massive Neutrino Peak Search Test, A0 (axion), and Other Light Boson (X0) Searches, etc.). p �+ DECAY MODES Fraction (Γi /Γ) Con�dence level (MeV/c) + � �� [b] (99:98770�0:00004) % 30 �+��γ [c] ( 2:00 �0:25 ) � 10−4 30 e+�e [b] ( 1:230 �0:004 ) � 10−4 70 e+�e γ [c] ( 1:61 �0:23 ) � 10−7 70 e+�e �0 ( 1:025 �0:034 ) � 10−8 4 e+�e e+ e− ( 3:2 �0:5 ) � 10−9 70 e+�e � � < 5 � 10−6 90% 70 Lepton Family number (LF) or Lepton number (L) violating modes �+�e L [d] < 1:5 � 10−3 90% 30 �+�e LF [d] < 8:0 � 10−3 90% 30 �−e+e+� LF < 1:6 � 10−6 90% 30 HTTP://PDG.LBL.GOV Page 1 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) �0 IG (JPC ) = 1−(0 − +) Mass m = 134:9766 � 0:0006 MeV (S = 1.1) m �� − m�0 = 4:5936 � 0:0005 MeV −17 Mean life � = (8:4 � 0:6) � 10 s (S = 3.0) c� = 25:1 nm For decay limits to particles which are not established, see the appropriate 0 0 Search setions (A (axion), and Other Light Boson (X ) Searches, etc.). Scale factor/ p �0 DECAY MODES Fraction (Γ /Γ) Con�dence level (MeV/c) i 2γ (98:798�0:032) % S=1.1 67 + − e e γ ( 1:198�0:032) % S=1.1 67 −9 γ positronium ( 1:82 �0:29 ) � 10 67 + + − − −5 e e e e ( 3:14 �0:30 ) � 10 67 + − −8 e e ( 6:2 �0:5 ) � 10 67 −8 4γ < 2 � 10 CL=90% 67 −7 � � [e] < 8:3 � 10 CL=90% 67 −6 �e �e < 1:7 � 10 CL=90% 67 −6 �� �� < 3:1 � 10 CL=90% 67 −6 �� �� < 2:1 � 10 CL=90% 67 −4 γ � � < 6 � 10 CL=90% 67 Charge conjugation (C) or Lepton Family number (LF) violating modes −8 3γ C < 3:1 � 10 CL=90% 67 + − −10 � e LF < 3:8 � 10 CL=90% 26 − + −9 � e LF < 3:4 � 10 CL=90% 26 + − − + −8 � e + � e LF < 1:72 � 10 CL=90% 26 � IG (JPC ) = 0+(0 − +) [f ] Mass m = 547:75 � 0:12 MeV (S = 2.6) [g] Full width Γ = 1:29 � 0:07 keV C-nonconserving decay parameters + − 0 −2 � � � Left-right asymmetry = (0:09 � 0:17) � 10 + − 0 −2 � � � Sextant asymmetry = (0:18 � 0:16) � 10 + − 0 −2 � � � Quadrant asymmetry = (−0:17 � 0:17) � 10 + − −2 � � γ Left-right asymmetry = (0:9 � 0:4) � 10 + − � � γ � (D-wave) = −0:02 � 0:07 (S = 1.3) HTTP://PDG.LBL.GOV Page 2 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) Dalitz plot parameter 0 0 0 � � � � = −0:031 � 0:004 (S = 1.1) Scale factor/ p � DECAY MODES Fraction (Γ /Γ) Con�dence level (MeV/c) i Neutral modes neutral modes (72:0 � 0:5 ) % S=1.3 { 2γ [g] (39:43� 0:26) % S=1.2 274 0 3� (32:51� 0:29) % S=1.2 179 0 −4 � 2γ ( 7:2 � 1:4 ) � 10 257 other neutral modes < 2:8 % CL=90% { Charged modes charged modes (28:0 � 0:5 ) % S=1.3 { + − 0 � � � (22:6 � 0:4 ) % S=1.3 174 + − � � γ ( 4:68� 0:11) % S=1.2 236 + − −3 e e γ ( 6:0 � 0:8 ) � 10 S=1.4 274 + − −4 � � γ ( 3:1 � 0:4 ) � 10 253 + − −5 e e < 7:7 � 10 CL=90% 274 + − −6 � � ( 5:8 � 0:8 ) � 10 253 + − + − −5 e e e e < 6:9 � 10 CL=90% 274 + − + − +14:0 −4 � � e e ( 4:0 ) � 10 S=5.8 235 − 2:7 + − −3 � � 2γ < 2:0 � 10 236 + − 0 −4 � � � γ < 5 � 10 CL=90% 174 0 + − −6 � � � γ < 3 � 10 CL=90% 210 Charge conjugation (C), Parity (P), Charge conjugation � Parity (CP), or Lepton Family number (LF) violating modes + − −4 � � P,CP < 3:3 � 10 CL=90% 236 0 0 −4 � � P,CP < 4:3 � 10 CL=90% 238 −4 3γ C < 5 � 10 CL=95% 274 0 −7 4� P,CP < 6:9 � 10 CL=90% 40 0 + − −5 � e e C [h] < 4 � 10 CL=90% 257 0 + − −6 � � � C [h] < 5 � 10 CL=90% 210 + − − + −6 � e + � e LF < 6 � 10 CL=90% 264 HTTP://PDG.LBL.GOV Page 3 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) [i ] f 0(600) IG (JPC ) = 0+(0 + +) or � Mass m = (400{1200) MeV Full width Γ = (600{1000) MeV f0 0(600) DECAY MODES Fraction (Γi /Γ) p (MeV/c) �� dominant { γ γ seen { [j] G PC + −− �(770) I (J ) = 1 (1 ) Mass m = 775:8 � 0:5 MeV Full width Γ = 150:3 � 1:6 MeV Γee = 7:02 � 0:11 keV Scale factor/ p �(770) DECAY MODES Fraction (Γ /Γ) Con�dence level (MeV/c) i �� � 100 % 364 � �(770) decays � −4 � γ ( 4:5 �0:5 ) � 10 S=2.2 375 � −3 � � < 6 � 10 CL=84% 153 � + − 0 −3 � � � � < 2:0 � 10 CL=84% 254 0 �(770) decays + − −3 � � γ ( 9:9 �1:6 ) � 10 362 0 −4 � γ ( 6:0 �1:3 ) � 10 S=1.1 376 −4 �γ ( 3:0 �0:4 ) � 10 S=1.4 195 0 0 −5 � � γ ( 4:5 �0:8 ) � 10 364 + − −5 � � [k] ( 4:55�0:28 ) � 10 373 + − −5 e e [k] ( 4:67�0:09 ) � 10 388 + − 0 +0:54 −4 � � � ( 1:01 �0:34) � 10 323 −0:36 + − + − −5 � � � � ( 1:8 �0:9 ) � 10 251 + − 0 0 −5 � � � � < 4 � 10 CL=90% 257 HTTP://PDG.LBL.GOV Page 4 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) G PC − −− !(782) I (J ) = 0 (1 ) Mass m = 782:59 � 0:11 MeV (S = 1.7) Full width Γ = 8:49 � 0:08 MeV Γee = 0:60 � 0:02 keV Scale factor/ p !(782) DECAY MODES Fraction (Γ /Γ) Con�dence level (MeV/c) i + − 0 � � � (89:1 �0:7 ) % S=1.1 327 0 +0:28 � γ ( 8:92 ) % S=1.1 380 −0:24 + − � � ( 1:70�0:27) % S=1.4 366 0 +7:0 −3 neutrals (excluding� γ ) ( 1:4 ) � 10 { −0:9 −4 �γ ( 4:9 �0:5 ) � 10 200 0 + − −4 � e e ( 5:9 �1:9 ) � 10 380 0 + − −5 � � � ( 9:6 �2:3 ) � 10 349 + − −5 e e ( 7:14�0:13) � 10 S=1.1 391 + − 0 0 � � � � < 2 % CL=90% 262 + − −3 � � γ < 3:6 � 10 CL=95% 366 + − + − −3 � � � � < 1 � 10 CL=90% 256 0 0 −5 � � γ ( 6:7 �1:1 ) � 10 367 0 −5 �� γ < 3:3 � 10 CL=90% 162 + − −5 � � ( 9:0 �3:1 ) � 10 377 −4 3γ < 1:9 � 10 CL=95% 391 Charge conjugation (C) violating modes 0 −3 �� C < 1 � 10 CL=90% 162 0 −4 3� C < 3 � 10 CL=90% 330 0 G PC + − + � (958) I (J ) = 0 (0 ) Mass m = 957:78 � 0:14 MeV Full width Γ = 0:202 � 0:016 MeV (S = 1.3) Scale factor/ p �0(958) DECAY MODES Fraction (Γ /Γ) Con�dence level (MeV/c) i + − � � � (44:3 �1:5 ) % S=1.2 232 0 � γ (including non-resonant (29:5 �1:0 ) % S=1.2 165 + − � � γ) 0 0 � � � (20:9 �1:2 ) % S=1.2 239 !γ ( 3:03�0:31) % 159 γ γ ( 2:12�0:14) % S=1.3 479 0 −3 3� ( 1:56�0:26) � 10 430 + − −4 � � γ ( 1:04�0:26) � 10 467 + − 0 � � � < 5 % CL=90% 428 HTTP://PDG.LBL.GOV Page 5 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) 0 0 � � < 4 % CL=90% 110 + + − − � � � � < 1 % CL=90% 372 + + − − � � � � neutrals < 1 % CL=95% { + + − − 0 � � � � � < 1 % CL=90% 298 6� < 1 % CL=90% 211 + − + − −3 � � e e < 6 � 10 CL=90% 458 + − −4 γ e e < 9 � 10 CL=90% 479 0 −4 � γγ < 8 � 10 CL=90% 469 0 −4 4� < 5 � 10 CL=90% 380 + − −7 e e < 2:1 � 10 CL=90% 479 Charge conjugation (C), Parity (P), Lepton family number (LF) violating modes + − � � P,CP < 2 % CL=90% 458 0 0 −4 � � P,CP < 9 � 10 CL=90% 459 0 + − −3 � e e C [h] < 1:4 � 10 CL=90% 469 + − −3 �e e C [h] < 2:4 � 10 CL=90% 322 −4 3γ C < 1:0 � 10 CL=90% 479 + − 0 −5 � � � C [h] < 6:0 � 10 CL=90% 445 + − −5 � � � C [h] < 1:5 � 10 CL=90% 273 −4 e � LF < 4:7 � 10 CL=90% 473 [l] G PC + + + f 0(980) I (J ) = 0 (0 ) Mass m = 980 � 10 MeV Full width Γ = 40 to 100 MeV f 0(980) DECAY MODES Fraction (Γi /Γ) p (MeV/c) �� dominant 471 K K seen y γ γ seen 490 [l] G PC − + + a0 0(980) I (J ) = 1 (0 ) Mass m = 984:7 � 1:2 MeV (S = 1.5) Full width Γ = 50 to 100 MeV a 0(980) DECAY MODES Fraction (Γi /Γ) p (MeV/c) �� dominant 322 K K seen y γ γ seen 492 HTTP://PDG.LBL.GOV Page 6 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) G PC − −− �(1020) I (J ) = 0 (1 ) Mass m = 1019:456 � 0:020 MeV (S = 1.1) Full width Γ = 4:26 � 0:05 MeV (S = 1.7) Scale factor/ p �(1020) DECAY MODES Fraction (Γ /Γ) Con�dence level (MeV/c) i + − K K (49:1 �0:6 ) % S=1.2 127 0 0 K K (34:0 �0:5 ) % S=1.1 110 L S + − 0 �� + � � � (15:4 �0:5 ) % S=1.3 { �γ ( 1:295�0:025) % S=1.1 363 0 −3 � γ ( 1:23 �0:10 ) � 10 501 + − −4 e e ( 2:98 �0:04 ) � 10 S=1.1 510 + − −4 � � ( 2:85 �0:19 ) � 10 499 + − −4 �e e ( 1:15 �0:10 ) � 10 363 + − −5 � � ( 7:3 �1:3 ) � 10 490 0 +1:3 −5 !� ( 5:2 ) � 10 172 −1:1 !γ < 5 % CL=84% 209 −5 �γ < 1:2 � 10 CL=90% 215 + − −5 � � γ ( 4:1 �1:3 ) � 10 490 −4 f0(980)γ ( 4:40 �0:21 ) � 10 39 0 0 −4 � � γ ( 1:09 �0:06 ) � 10 492 + − + − +2:8 −6 � � � � ( 3:9 ) � 10 410 −2:2 + + − − 0 −6 � � � � � < 4:6 � 10 CL=90% 342 0 + − −5 � e e ( 1:12 �0:28 ) � 10 501 0 −5 � �γ ( 8:3 �0:5 ) � 10 346 −5 a0(980)γ ( 7:6 �0:6 ) � 10 34 0 −5 � (958)γ ( 6:2 �0:7 ) � 10 S=1.1 60 0 0 −5 �� � γ < 2 � 10 CL=90% 293 + − −5 � � γ ( 1:4 �0:5 ) � 10 499 −4 �γ γ < 5 � 10 CL=90% 215 + − −5 �� � < 1:8 � 10 CL=90% 288 + − −6 �� � < 9:4 � 10 CL=90% 321 G PC − +− h1 1(1170) I (J ) = 0 (1 ) Mass m = 1170 � 20 MeV Full width Γ = 360 � 40 MeV h 1(1170) DECAY MODES Fraction (Γi /Γ) p (MeV/c) �� seen 307 HTTP://PDG.LBL.GOV Page 7 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) G PC + +− b 1(1235) I (J ) = 1 (1 ) Mass m = 1229:5 � 3:2 MeV (S = 1.6) Full width Γ = 142 � 9 MeV (S = 1.2) p b 1(1235) DECAY MODES Fraction (Γi /Γ) Con�dence level (MeV/c) !� dominant 348 [D/S amplitude ratio = 0:277 � 0:027] � −3 � γ ( 1:6�0:4) � 10 607 �� seen y + + − 0 � � � � < 50 % 84% 535 � 0 (KK) � < 8 % 90% 248 0 0 � K K � < 6 % 90% 235 S L 0 0 � K K � < 2 % 90% 235 S S �� < 1:5 % 84% 147 [m] G PC − + + a1 1(1260) I (J ) = 1 (1 ) [n] Mass m = 1230 � 40 MeV Full width Γ = 250 to 600 MeV a1 1(1260) DECAY MODES Fraction (Γi /Γ) p (MeV/c) (�� )S−wave seen 353 (�� )D−wave seen 353 (�(1450)� )S−wave seen y (�(1450)� )D−wave seen y �� seen { f0(980)� not seen 189 f0(1370)� seen { f2(1270)� seen y � K K (892)+ c.c. seen y �γ seen 608 G PC + + + f 2(1270) I (J ) = 0 (2 ) Mass m = 1275:4 � 1:2 MeV +3:5 Full width Γ = 185:1 MeV (S = 1.5) −2:6 Scale factor/ p f2 2(1270) DECAY MODES Fraction (Γi /Γ) Con�dence level (MeV/c) +2:5 �� (84:8 ) % S=1.3 623 −1:3 + − 0 +1:5 � � 2� ( 7:1 ) % S=1.3 563 −2:7 HTTP://PDG.LBL.GOV Page 8 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) K K ( 4:6 �0:4 ) % S=2.7 404 + − 2� 2� ( 2:8 �0:4 ) % S=1.2 559 −3 �� ( 4:5 �1:0 ) � 10 S=2.4 327 0 −3 4� ( 3:0 �1:0 ) � 10 565 −5 γ γ ( 1:41�0:13) � 10 638 −3 ��� < 8 � 10 CL=95% 478 0 − + −3 K K � + c.c. < 3:4 � 10 CL=95% 293 + − −10 e e < 6 � 10 CL=90% 638 G PC + + + f 1(1285) I (J ) = 0 (1 ) Mass m = 1281:8 � 0:6 MeV (S = 1.6) Full width Γ = 24:1 � 1:1 MeV (S = 1.3) Scale factor/ p f 1(1285) DECAY MODES Fraction (Γi /Γ) Con�dence level (MeV/c) + 2:1 4� (33:1 ) % S=1.3 568 − 1:8 0 0 + − + 1:4 � � � � (22:0 ) % S=1.3 566 − 1:2 + − + 0:7 2� 2� (11:0 ) % S=1.3 563 − 0:6 0 + − + 0:7 � � � (11:0 ) % S=1.3 336 − 0:6 0 0 � � seen y 0 −4 4� < 7 � 10 CL=90% 568 ��� (52 �16 ) % 482 a0(980)� [ignoring a0(980) ! (36 � 7 ) % 234 K K] ��� [excluding a0(980)�] (16 � 7 ) % 482 K K � ( 9:0� 0:4) % S=1.1 308 � K K (892) not seen y 0 γ � ( 5:5� 1:3) % S=2.8 406 −4 �γ ( 7:4� 2:6) � 10 236 HTTP://PDG.LBL.GOV Page 9 Created: 12/9/2004 14:01 Citation: S. Eidelman et al. (Particle Data Group), Phys. Lett. B 592, 1 (2004) (URL: http://pdg.lbl.gov) G PC + − + �(1295) I (J ) = 0 (0 ) Mass m = 1294 � 4 MeV (S = 1.6) Full width Γ = 55 � 5 MeV �(1295) DECAY MODES Fraction (Γ /Γ) p (MeV/c) i + − �� � seen 487 a0(980)� seen 244 0 0 �� � seen 490 � (��)S-wave seen { G PC − − + �(1300) I (J ) = 1 (0 ) [n] Mass m = 1300 � 100 MeV Full width Γ = 200 to 600 MeV �(1300) DECAY MODES Fraction (Γ /Γ) p (MeV/c) i �� seen 404 � (��)S-wave seen { G PC − + + a2 2(1320) I (J ) = 1 (2 ) Mass m = 1318:3 � 0:6 MeV (S = 1.2) [n] Full width Γ = 107 � 5 MeV Scale factor/ p a2 2(1320) DECAY MODES Fraction (Γi /Γ) Con�dence level (MeV/c) �� (70:1 �2:7 ) % S=1.2 416 �� (14:5 �1:2 ) % 535 !�� (10:6 �3:2 ) % S=1.3 366 K K ( 4:9 �0:8 ) % 437 0 −3 � (958)� ( 5:3 �0:9 ) � 10 288 � −3 � γ ( 2:68�0:31) � 10 652 −6 γ γ ( 9:4 �0:7 ) � 10 659 + − − � � � < 8 % CL=90% 621 + − −9 e e < 6 � 10 CL=90% 659 HTTP://PDG.LBL.GOV Page 10 Created: 12/9/2004 14:01