LIGHT UNFLAVORED MESONS (S = C = B = 0)
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- Κύμα Ιωάννου
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1 LIGHT UNFLAVORED MESONS (S = C = B = 0) For I = 1 (π, b, ρ, a): ud, (uu dd)/ 2, du; for I = 0 (η, η, h, h, ω, φ, f, f ): c 1 (uu + d d) + c 2 (s s) π ± I G (J P ) = 1 (0 ) Mass m = ± MeV (S = 1.2) Mean life τ = ( ± ) 10 8 s (S = 1.2) cτ = m π ± l ± νγ form factors [a] F V = ± F A = ± F V slope parameter a = 0.10 ± 0.06 R = π modes are charge conjugates of the modes below. For decay limits to particles which are not established, see the section on Searches for Axions and Other Very Light Bosons. p π + DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) µ + ν µ [b] ( ± ) % 30 µ + ν µ γ [c] ( 2.00 ±0.25 ) e + ν e [b] ( ±0.004 ) e + ν e γ [c] ( 7.39 ±0.05 ) e + ν e π 0 ( ±0.006 ) e + ν e e + e ( 3.2 ±0.5 ) e + ν e νν < % 70 Lepton Family number (LF) or Lepton number (L) violating modes µ + ν e L [d] < % 30 µ + ν e LF [d] < % 30 µ e + e + ν LF < % 30 Page 1 Created: 7/12/ :49
2 π 0 I G (J PC ) = 1 (0 + ) Mass m = ± MeV (S = 1.1) m π ± m π 0 = ± MeV Mean life τ = (8.52 ± 0.18) s (S = 1.2) cτ = 25.5 nm For decay limits to particles which are not established, see the appropriate Search sections (A 0 (axion) and Other Light Boson (X 0 ) Searches, etc.). Scale factor/ p π 0 DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) 2γ (98.823±0.034) % S= e + e γ ( 1.174±0.035) % S= γpositronium ( 1.82 ±0.29 ) e + e + e e ( 3.34 ±0.16 ) e + e ( 6.46 ±0.33 ) γ < CL=90% 67 νν [e] < CL=90% 67 ν e ν e < CL=90% 67 ν µ ν µ < CL=90% 67 ν τ ν τ < CL=90% 67 γνν < CL=90% 67 Charge conjugation (C) or Lepton Family number (LF) violating modes 3γ C < CL=90% 67 µ + e LF < CL=90% 26 µ e + LF < CL=90% 26 µ + e + µ e + LF < CL=90% 26 η I G (J PC ) = 0 + (0 + ) Mass m = ± MeV Full width Γ = 1.31 ± 0.05 kev C-nonconserving decay parameters π + π π 0 left-right asymmetry = ( ) 10 2 π + π π 0 sextant asymmetry = ( ) 10 2 π + π π 0 quadrant asymmetry = ( 0.09 ± 0.09) 10 2 π + π γ left-right asymmetry = (0.9 ± 0.4) 10 2 π + π γ β (D-wave) = 0.02 ± 0.07 (S = 1.3) CP-nonconserving decay parameters π + π e + e decay-plane asymmetry A φ = ( 0.6 ± 3.1) Page 2 Created: 7/12/ :49
![823±0.034) % S=1.5 67 e + e γ ( 1.174±0.035) % S=1.5 67 γpositronium ( 1.82 ±0.29 ) 10 9 67 e + e + e e ( 3.34 ±0.16 ) 10 5 67 e + e ( 6.46 ±0.33 ) 10 8 67 4γ < 2 10 8 CL=90% 67 νν [e] < 2.](/docs-images/53/10459403/images/page_2.jpg "7 10 7 CL=90% 67 ν e ν e < 1.7 10 6 CL=90% 67 ν µ ν µ < 1.6 10 6 CL=90% 67 ν τ ν τ < 2.")
3 Dalitz plot parameter π 0 π 0 π 0 α = ± Scale factor/ p η DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) Neutral modes neutral modes (72.12±0.34) % S=1.2 2γ (39.41±0.20) % S= π 0 (32.68±0.23) % S= π 0 2γ ( 2.7 ±0.5 ) 10 4 S= π 0 2γ < CL=90% 238 4γ < CL=90% 274 invisible < CL=90% Charged modes charged modes (28.10±0.34) % S=1.2 π + π π 0 (22.92±0.28) % S= π + π γ ( 4.22±0.08) % S= e + e γ ( 6.9 ±0.4 ) 10 3 S= µ + µ γ ( 3.1 ±0.4 ) e + e < CL=90% 274 µ + µ ( 5.8 ±0.8 ) e + 2e ( 2.40±0.22) π + π e + e (γ) ( 2.68±0.11) e + e µ + µ < CL=90% 253 2µ + 2µ < CL=90% 161 µ + µ π + π < CL=90% 113 π + e ν e + c.c. < CL=90% 256 π + π 2γ < π + π π 0 γ < CL=90% 174 π 0 µ + µ γ < CL=90% 210 Charge conjugation (C), Parity (P), Charge conjugation Parity (CP), or Lepton Family number (LF) violating modes π 0 γ C < CL=90% 257 π + π P,CP < CL=90% 236 2π 0 P,CP < CL=90% 238 2π 0 γ C < CL=90% 238 3π 0 γ C < CL=90% 179 3γ C < CL=90% Page 3 Created: 7/12/ :49
4 4π 0 P,CP < CL=90% 40 π 0 e + e C [f ] < CL=90% 257 π 0 µ + µ C [f ] < CL=90% 210 µ + e + µ e + LF < CL=90% 264 f 0 (500) or σ [g] was f 0 (600) I G (J PC ) = 0 + (0 + + ) Mass m = ( ) MeV Full width Γ = ( ) MeV f 0 (500) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) π π dominant γγ seen ρ(770) [h] I G (J PC ) = 1 + (1 ) Mass m = ± 0.25 MeV Full width Γ = ± 0.8 MeV Γ ee = 7.04 ± 0.06 kev Scale factor/ p ρ(770) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) ππ 100 % 363 ρ(770) ± decays π ± γ ( 4.5 ±0.5 ) 10 4 S= π ± η < CL=84% 152 π ± π + π π 0 < CL=84% 254 ρ(770) 0 decays π + π γ ( 9.9 ±1.6 ) π 0 γ ( 6.0 ±0.8 ) ηγ ( 3.00±0.20 ) π 0 π 0 γ ( 4.5 ±0.8 ) µ + µ [i] ( 4.55±0.28 ) e + e [i] ( 4.72±0.05 ) π + π π 0 ( π + π π + π ( 1.8 ±0.9 ) π + π π 0 π 0 ( 1.6 ±0.8 ) π 0 e + e < CL=90% Page 4 Created: 7/12/ :49
![(400 550) MeV Full width Γ = (400 700) MeV f 0 (500) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) π π dominant γγ seen ρ(770) [h] I G (J PC ) = 1 + (1 ) Mass m = 775.26 ± 0.25 MeV Full width Γ = 149.1 ± 0.](/docs-images/53/10459403/images/page_4.jpg "8 MeV Γ ee = 7.04 ± 0.06 kev Scale factor/ p ρ(770) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) ππ 100 % 363 ρ(770) ± decays π ± γ ( 4.5 ±0.5 ) 10 4 S=2.")
5 ω(782) ω(782) I G (J PC ) = 0 (1 ) Mass m = ± 0.12 MeV (S = 1.9) Full width Γ = 8.49 ± 0.08 MeV Γ ee = 0.60 ± 0.02 kev Scale factor/ p ω(782) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) π + π π 0 (89.2 ±0.7 ) % 327 π 0 γ ( 8.28±0.28) % S= π + π ( ) % S= neutrals (excludingπ 0 γ) ( ) 10 3 S=1.1 ηγ ( 4.6 ±0.4 ) 10 4 S= π 0 e + e ( 7.7 ±0.6 ) π 0 µ + µ ( 1.3 ±0.4 ) 10 4 S= e + e ( 7.28±0.14) 10 5 S= π + π π 0 π 0 < CL=90% 262 π + π γ < CL=95% 366 π + π π + π < CL=90% 256 π 0 π 0 γ ( 6.6 ±1.1 ) ηπ 0 γ < CL=90% 162 µ + µ ( 9.0 ±3.1 ) γ < CL=95% 391 Charge conjugation (C) violating modes ηπ 0 C < CL=90% 162 2π 0 C < CL=90% 367 3π 0 C < CL=90% Page 5 Created: 7/12/ :49
6 η (958) I G (J PC ) = 0 + (0 + ) Mass m = ± 0.06 MeV Full width Γ = ± MeV p η (958) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) π + π η (42.9 ±0.7 ) % 232 ρ 0 γ(including non-resonant (29.1 ±0.5 ) % 165 π + π γ) π 0 π 0 η (22.2 ±0.8 ) % 239 ωγ ( 2.75±0.23) % 159 γγ ( 2.20±0.08) % 479 3π 0 ( 2.14±0.20) µ + µ γ ( 1.08±0.27) π + π µ + µ < % 401 π + π π 0 ( 3.8 ±0.4 ) π 0 ρ 0 < 4 % 90% 111 2(π + π ) < % 372 π + π 2π 0 < % 376 2(π + π ) neutrals < 1 % 95% 2(π + π )π 0 < % 298 2(π + π )2π 0 < 1 % 95% 197 3(π + π ) < % 189 π + π e + e ( π + e ν e + c.c. < % 469 γe + e < % 479 π 0 γγ < % 469 4π 0 < % 380 e + e < % 479 invisible < % Charge conjugation (C), Parity (P), Lepton family number (LF) violating modes π + π P,CP < % 458 π 0 π 0 P,CP < % 459 π 0 e + e C [f ] < % 469 ηe + e C [f ] < % 322 3γ C < % 479 µ + µ π 0 C [f ] < % 445 µ + µ η C [f ] < % 273 e µ LF < % Page 6 Created: 7/12/ :49
7 f 0 (980) [j] I G (J PC ) = 0 + (0 + + ) Mass m = 990 ± 20 MeV Full width Γ = 40 to 100 MeV f 0 (980) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) π π dominant 476 K K seen 36 γγ seen 495 a 0 (980) [j] I G (J PC ) = 1 (0 + + ) Mass m = 980 ± 20 MeV Full width Γ = 50 to 100 MeV a 0 (980) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) η π dominant 319 K K seen γγ seen 490 φ(1020) φ(1020) I G (J PC ) = 0 (1 ) Mass m = ± MeV (S = 1.1) Full width Γ = 4.26 ± 0.04 MeV (S = 1.4) Scale factor/ p φ(1020) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) K + K (48.9 ±0.5 ) % S= K 0 L K0 S (34.2 ±0.4 ) % S= ρπ + π + π π 0 (15.32 ±0.32 ) % S=1.1 η γ ( 1.309±0.024) % S= π 0 γ ( 1.27 ±0.06 ) l + l 510 e + e ( 2.954±0.030) 10 4 S= µ + µ ( 2.87 ±0.19 ) ηe + e ( 1.15 ±0.10 ) π + π ( 7.4 ±1.3 ) ωπ 0 ( 4.7 ±0.5 ) ω γ < 5 % CL=84% 209 ργ < CL=90% 215 π + π γ ( 4.1 ±1.3 ) Page 7 Created: 7/12/ :49
8 f 0 (980)γ ( 3.22 ±0.19 ) 10 4 S= π 0 π 0 γ ( 1.13 ±0.06 ) π + π π + π ( ) π + π + π π π 0 < CL=90% 342 π 0 e + e ( 1.12 ±0.28 ) π 0 ηγ ( 7.27 ±0.30 ) 10 5 S= a 0 (980)γ ( 7.6 ±0.6 ) K 0 K 0 γ < CL=90% 110 η (958)γ ( 6.25 ±0.21 ) ηπ 0 π 0 γ < CL=90% 293 µ + µ γ ( 1.4 ±0.5 ) ργγ < CL=90% 215 ηπ + π < CL=90% 288 ηµ + µ < CL=90% 321 Lepton Faminly number (LF) violating modes e ± µ LF < CL=90% 504 h 1 (1170) I G (J PC ) = 0 (1 + ) Mass m = 1170 ± 20 MeV Full width Γ = 360 ± 40 MeV h 1 (1170) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ρπ seen 308 b 1 (1235) I G (J PC ) = 1 + (1 + ) Mass m = ± 3.2 MeV (S = 1.6) Full width Γ = 142 ± 9 MeV (S = 1.2) p b 1 (1235) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) ω π dominant [D/S amplitude ratio = ± 0.027] 348 π ± γ ( 1.6±0.4) ηρ seen π + π + π π 0 < 50 % 84% 535 K (892) ± K seen (KK) ± π 0 < 8 % 90% 248 K 0 S K0 L π± < 6 % 90% 235 K 0 S K0 S π± < 2 % 90% 235 φ π < 1.5 % 84% Page 8 Created: 7/12/ :49
9 a 1 (1260) [k] I G (J PC ) = 1 (1 + + ) Mass m = 1230 ± 40 MeV [l] Full width Γ = 250 to 600 MeV a 1 (1260) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) (ρπ) S wave seen 353 (ρπ) D wave seen 353 (ρ(1450)π) S wave seen (ρ(1450)π) D wave seen σπ seen f 0 (980)π not seen 179 f 0 (1370)π seen f 2 (1270)π seen K K (892)+ c.c. seen πγ seen 608 f 2 (1270) I G (J PC ) = 0 + (2 + + ) Mass m = ± 1.2 MeV (S = 1.1) Full width Γ = MeV (S = 1.5) Scale factor/ p f 2 (1270) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) ππ ( ) % S= π + π 2π 0 ( ) % S= K K ( 4.6 ±0.4 ) % S= π + 2π ( 2.8 ±0.4 ) % S= ηη ( 4.0 ±0.8 ) 10 3 S= π 0 ( 3.0 ±1.0 ) γγ ( 1.64±0.19) 10 5 S= ηππ < CL=95% 477 K 0 K π + + c.c. < CL=95% 293 e + e < CL=90% Page 9 Created: 7/12/ :49
10 f 1 (1285) I G (J PC ) = 0 + (1 + + ) Mass m = ± 0.5 MeV (S = 1.8) Full width Γ = 24.2 ± 1.1 MeV (S = 1.3) Scale factor/ p f 1 (1285) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) 4π ( ) % S= π 0 π 0 π + π ( ) % S= π + 2π ( ) % S= ρ 0 π + π ( ) % S= ρ 0 ρ 0 seen 4π 0 < CL=90% 568 ηπ + π (35 ±15 ) % 479 ηππ ( ) % S= a 0 (980)π [ignoring a 0 (980) (36 ± 7 ) % 238 K K] ηππ [excluding a 0 (980)π] (16 ± 7 ) % 482 K K π ( 9.0± 0.4) % S= K K (892) not seen π + π π 0 ( 3.0± 0.9) ρ ± π < CL=95% 390 γρ 0 ( 5.5± 1.3) % S= φγ ( 7.4± 2.6) η(1295) η(1295) I G (J PC ) = 0 + (0 + ) Mass m = 1294 ± 4 MeV (S = 1.6) Full width Γ = 55 ± 5 MeV η(1295) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ηπ + π seen 487 a 0 (980)π seen 248 ηπ 0 π 0 seen 490 η(ππ) S-wave seen Page 10 Created: 7/12/ :49
11 π(1300) π(1300) I G (J PC ) = 1 (0 + ) Mass m = 1300 ± 100 MeV [l] Full width Γ = 200 to 600 MeV π(1300) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ρπ seen 404 π(ππ) S-wave seen a 2 (1320) I G (J PC ) = 1 (2 + + ) Mass m = MeV (S = 1.2) Full width Γ = 107 ± 5 MeV [l] Scale factor/ p a 2 (1320) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) 3π (70.1 ±2.7 ) % S= ηπ (14.5 ±1.2 ) % 535 ωππ (10.6 ±3.2 ) % S= K K ( 4.9 ±0.8 ) % 437 η (958)π ( 5.3 ±0.9 ) π ± γ ( 2.68±0.31) γγ ( 9.4 ±0.7 ) e + e < CL=90% 659 f 0 (1370) [j] I G (J PC ) = 0 + (0 + + ) Mass m = 1200 to 1500 MeV Full width Γ = 200 to 500 MeV f 0 (1370) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ππ seen 672 4π seen 617 4π 0 seen 617 2π + 2π seen 612 π + π 2π 0 seen 615 ρ ρ dominant 2(ππ) S-wave seen π(1300)π seen a 1 (1260)π seen 35 Page 11 Created: 7/12/ :49
12 ηη seen 411 K K seen 475 K K nπ not seen 6π not seen 508 ωω not seen γγ seen 685 e + e not seen 685 π 1 (1400) [n] I G (J PC ) = 1 (1 + ) Mass m = 1354 ± 25 MeV (S = 1.8) Full width Γ = 330 ± 35 MeV π 1 (1400) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ηπ 0 seen 557 ηπ seen 556 η(1405) [o] I G (J PC ) = 0 + (0 + ) Mass m = ± 1.8 MeV [l] (S = 2.1) Full width Γ = 51.0 ± 2.9 MeV [l] (S = 1.8) p η(1405) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) K K π seen 424 ηππ seen 562 a 0 (980)π seen 345 η(ππ) S-wave seen f 0 (980)η seen 4π seen 639 ρρ <58 % 99.85% ρ 0 γ seen 491 K (892)K seen Page 12 Created: 7/12/ :49
![8 ± 1.8 MeV [l] (S = 2.1) Full width Γ = 51.0 ± 2.9 MeV [l] (S = 1.](/docs-images/53/10459403/images/page_12.jpg "8) p η(1405) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) K K π seen 424 ηππ seen 562 a 0 (980)π seen 345 η(ππ) S-wave seen f 0 (980)η seen 4π seen 639")
13 f 1 (1420) [p] I G (J PC ) = 0 + (1 + + ) Mass m = ± 0.9 MeV (S = 1.1) Full width Γ = 54.9 ± 2.6 MeV f 1 (1420) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K π dominant 438 K K (892)+ c.c. dominant 163 η π π possibly seen 573 φγ seen 349 ω(1420) [q] I G (J PC ) = 0 (1 ) Mass m ( ) MeV Full width Γ ( ) MeV ω(1420) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ρ π dominant 486 ωππ seen 444 b 1 (1235)π seen 125 e + e seen 710 a 0 (1450) [j] I G (J PC ) = 1 (0 + + ) Mass m = 1474 ± 19 MeV Full width Γ = 265 ± 13 MeV a 0 (1450) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) πη seen 627 πη (958) seen 410 K K seen 547 ωππ seen 484 a 0 (980)ππ seen 342 γγ seen Page 13 Created: 7/12/ :49
14 ρ(1450) [r] I G (J PC ) = 1 + (1 ) Mass m = 1465 ± 25 MeV [l] Full width Γ = 400 ± 60 MeV [l] ρ(1450) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ππ seen 720 4π seen 669 e + e seen 732 η ρ possibly seen 311 a 2 (1320)π not seen 54 K K not seen 541 K K (892)+ c.c. possibly seen 229 η γ possibly seen 630 f 0 (500)γ not seen f 0 (980)γ not seen 398 f 0 (1370)γ not seen 92 f 2 (1270)γ not seen 178 η(1475) [o] I G (J PC ) = 0 + (0 + ) Mass m = 1476 ± 4 MeV (S = 1.3) Full width Γ = 85 ± 9 MeV (S = 1.5) η(1475) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K π dominant 477 K K (892)+ c.c. seen 245 a 0 (980)π seen 396 γγ seen Page 14 Created: 7/12/ :49
![c. possibly seen 229 η γ possibly seen 630 f 0 (500)γ not seen f 0 (980)γ not seen 398 f 0 (1370)γ not seen 92 f 2 (1270)γ not seen 178 η(1475) [o] I G (J PC ) = 0 + (0](/docs-images/53/10459403/images/page_14.jpg "+ ) Mass m = 1476 ± 4 MeV (S = 1.3) Full width Γ = 85 ± 9 MeV (S = 1.5) η(1475) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K π dominant 477 K K (892)+ c.c. seen 245 a 0 (980)π seen 396 γγ seen 738 HTTP://PDG.")
15 f 0 (1500) [n] I G (J PC ) = 0 + (0 + + ) Mass m = 1505 ± 6 MeV (S = 1.3) Full width Γ = 109 ± 7 MeV p f 0 (1500) DECAY MODES Fraction (Γ i /Γ) Scale factor (MeV/c) π π (34.9±2.3) % π + π seen 740 2π 0 seen 741 4π (49.5±3.3) % π 0 seen 691 2π + 2π seen 687 2(ππ) S-wave seen ρρ seen π(1300)π seen 144 a 1 (1260)π seen 218 ηη ( 5.1±0.9) % ηη (958) ( 1.9±0.8) % 1.7 K K ( 8.6±1.0) % γ γ not seen 753 f 2 (1525) IG (J PC ) = 0 + (2 + + ) Mass m = 1525 ± 5 MeV [l] Full width Γ = MeV [l] f 2 (1525) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K (88.7 ±2.2 ) % 581 ηη (10.4 ±2.2 ) % 530 ππ ( 8.2 ±1.5 ) γγ ( 1.11±0.14) Page 15 Created: 7/12/ :49
16 π 1 (1600) [n] I G (J PC ) = 1 (1 + ) Mass m = MeV Full width Γ = 241 ± 40 MeV (S = 1.4) π 1 (1600) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) πππ not seen 803 ρ 0 π not seen 641 f 2 (1270)π not seen 318 b 1 (1235)π seen 357 η (958)π seen 543 f 1 (1285)π seen 314 η 2 (1645) I G (J PC ) = 0 + (2 + ) Mass m = 1617 ± 5 MeV Full width Γ = 181 ± 11 MeV η 2 (1645) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) a 2 (1320)π seen 242 K K π seen 580 K K seen 404 ηπ + π seen 685 a 0 (980)π seen 499 f 2 (1270)η not seen ω(1650) [s] I G (J PC ) = 0 (1 ) Mass m = 1670 ± 30 MeV Full width Γ = 315 ± 35 MeV ω(1650) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ρπ seen 647 ωππ seen 617 ωη seen 500 e + e seen Page 16 Created: 7/12/ :49
17 ω 3 (1670) I G (J PC ) = 0 (3 ) Mass m = 1667 ± 4 MeV Full width Γ = 168 ± 10 MeV [l] ω 3 (1670) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ρπ seen 645 ωππ seen 615 b 1 (1235)π possibly seen 361 π 2 (1670) I G (J PC ) = 1 (2 + ) Mass m = ± 3.0 MeV [l] (S = 1.4) Full width Γ = 260 ± 9 MeV [l] (S = 1.2) p π 2 (1670) DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV/c) 3π (95.8±1.4) % 809 f 2 (1270)π (56.3±3.2) % 329 ρπ (31 ±4 ) % 648 σπ (10.9±3.4) % (ππ) S-wave ( 8.7±3.4) % K K (892)+ c.c. ( 4.2±1.4) % 455 ωρ ( 2.7±1.1) % 304 γγ < % 836 ρ(1450)π < % 147 b 1 (1235)π < % 365 f 1 (1285)π possibly seen 323 a 2 (1320)π not seen 292 φ(1680) φ(1680) I G (J PC ) = 0 (1 ) Mass m = 1680 ± 20 MeV [l] Full width Γ = 150 ± 50 MeV [l] φ(1680) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K (892)+ c.c. dominant 462 K 0 S K π seen 621 K K seen 680 e + e seen 840 ωππ not seen 623 K + K π + π seen Page 17 Created: 7/12/ :49
18 ρ 3 (1690) I G (J PC ) = 1 + (3 ) Mass m = ± 2.1 MeV [l] Full width Γ = 161 ± 10 MeV [l] (S = 1.5) p ρ 3 (1690) DECAY MODES Fraction (Γ i /Γ) Scale factor (MeV/c) 4π (71.1 ± 1.9 ) % 790 π ± π + π π 0 (67 ±22 ) % 787 ωπ (16 ± 6 ) % 655 ππ (23.6 ± 1.3 ) % 834 K K π ( 3.8 ± 1.2 ) % 629 K K ( 1.58± 0.26) % ηπ + π seen 727 ρ(770)η seen 520 ππρ seen 633 Excluding 2ρ and a 2 (1320)π. a 2 (1320)π seen 307 ρρ seen 335 ρ(1700) [r] I G (J PC ) = 1 + (1 ) Mass m = 1720 ± 20 MeV [l] (ηρ 0 and π + π modes) Full width Γ = 250 ± 100 MeV [l] (ηρ 0 and π + π modes) ρ(1700) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) 2(π + π ) large 803 ρππ dominant 653 ρ 0 π + π large 651 ρ ± π π 0 large 652 a 1 (1260)π seen 404 h 1 (1170)π seen 447 π(1300)π seen 349 ρρ seen 372 π + π seen 849 ππ seen 849 K K (892)+ c.c. seen 496 ηρ seen 545 a 2 (1320)π not seen 334 K K seen 704 e + e seen 860 π 0 ω seen Page 18 Created: 7/12/ :49
![a 2 (1320)π seen 307 ρρ seen 335 ρ(1700) [r] I G (J PC ) = 1 + (1 ) Mass m = 1720 ± 20 MeV [l] (ηρ 0 and π + π modes) Full width Γ = 250 ± 100 MeV [l] (ηρ 0 and π + π modes) ρ(1700) DECAY MODES](/docs-images/53/10459403/images/page_18.jpg "Fraction (Γ i /Γ) p (MeV/c) 2(π + π ) large 803 ρππ dominant 653 ρ 0 π + π large 651 ρ ± π π 0 large 652 a 1 (1260)π seen 404 h 1 (1170)π seen 447 π(1300)π seen 349 ρρ seen 372 π + π seen 849 ππ seen")
19 f 0 (1710) [t] I G (J PC ) = 0 + (0 + + ) Mass m = 1720 ± 6 MeV (S = 1.6) Full width Γ = 135 ± 8 MeV (S = 1.1) f 0 (1710) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K seen 704 ηη seen 663 ππ seen 849 ωω seen 357 π(1800) π(1800) I G (J PC ) = 1 (0 + ) Mass m = 1812 ± 12 MeV (S = 2.3) Full width Γ = 208 ± 12 MeV π(1800) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) π + π π seen 879 f 0 (500)π seen f 0 (980)π seen 625 f 0 (1370)π seen 368 f 0 (1500)π not seen 250 ρπ not seen 732 ηηπ seen 661 a 0 (980)η seen 473 a 2 (1320)η not seen f 2 (1270)π not seen 442 f 0 (1370)π not seen 368 f 0 (1500)π seen 250 ηη (958)π seen 375 K 0 (1430)K seen K (892)K not seen Page 19 Created: 7/12/ :49
20 φ 3 (1850) I G (J PC ) = 0 (3 ) Mass m = 1854 ± 7 MeV Full width Γ = MeV (S = 1.2) φ 3 (1850) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K seen 785 K K (892)+ c.c. seen 602 π 2 (1880) I G (J PC ) = 1 (2 + ) Mass m = 1895 ± 16 MeV Full width Γ = 235 ± 34 MeV f 2 (1950) I G (J PC ) = 0 + (2 + + ) Mass m = 1944 ± 12 MeV (S = 1.5) Full width Γ = 472 ± 18 MeV f 2 (1950) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K (892)K (892) seen 387 π + π seen 962 π 0 π 0 seen 963 4π seen 925 ηη seen 803 K K seen 837 γγ seen 972 pp seen 254 f 2 (2010) I G (J PC ) = 0 + (2 + + ) Mass m = MeV Full width Γ = 202 ± 60 MeV f 2 (2010) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) φφ seen K K seen Page 20 Created: 7/12/ :49
21 a 4 (2040) I G (J PC ) = 1 (4 + + ) Mass m = MeV (S = 1.1) Full width Γ = MeV (S = 1.3) a 4 (2040) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) K K seen 868 π + π π 0 seen 974 ρπ seen 841 f 2 (1270)π seen 580 ωπ π 0 seen 819 ωρ seen 624 ηπ 0 seen 918 η (958)π seen 761 f 4 (2050) I G (J PC ) = 0 + (4 + + ) Mass m = 2018 ± 11 MeV (S = 2.1) Full width Γ = 237 ± 18 MeV (S = 1.9) f 4 (2050) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) ωω seen 637 π π (17.0±1.5) % 1000 K K ( ηη ( 2.1±0.8) π 0 < 1.2 % 964 a 2 (1320)π seen Page 21 Created: 7/12/ :49
22 φ(2170) φ(2170) I G (J PC ) = 0 (1 ) Mass m = 2175 ± 15 MeV (S = 1.6) Full width Γ = 61 ± 18 MeV φ(2170) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) e + e seen 1087 φf 0 (980) seen 416 K + K f 0 (980) seen K + K π + π K + K f 0 (980) K + K π 0 π 0 seen K 0 K ± π not seen 770 K (892) 0 K (892) 0 not seen 622 f 2 (2300) I G (J PC ) = 0 + (2 + + ) Mass m = 2297 ± 28 MeV Full width Γ = 149 ± 40 MeV f 2 (2300) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) φφ seen 529 K K seen 1037 γγ seen 1149 f 2 (2340) I G (J PC ) = 0 + (2 + + ) Mass m = 2339 ± 60 MeV Full width Γ = MeV f 2 (2340) DECAY MODES Fraction (Γ i /Γ) p (MeV/c) φφ seen 573 ηη seen Page 22 Created: 7/12/ :49
23 NOTES [a] See the Note on π ± l ± νγ and K ± l ± νγ Form Factors in the π ± Particle Listings for definitions and details. [b] Measurements of Γ(e + ν e )/Γ(µ + ν µ ) always include decays with γ s, and measurements of Γ(e + ν e γ) and Γ(µ + ν µ γ) never include low-energy γ s. Therefore, since no clean separation is possible, we consider the modes with γ s to be subreactions of the modes without them, and let [Γ(e + ν e ) + Γ(µ + ν µ )]/Γ total = 100%. [c] See the π ± Particle Listings for the energy limits used in this measurement; low-energy γ s are not included. [d] Derived from an analysis of neutrino-oscillation experiments. [e] Astrophysical and cosmological arguments give limits of order ; see the π 0 Particle Listings. [f ] C parity forbids this to occur as a single-photon process. [g] See the Note on scalar mesons in the f 0 (500) Particle Listings. The interpretation of this entry as a particle is controversial. [h] See the Note on ρ(770) in the ρ(770) Particle Listings. [i] The ωρ interference is then due to ωρ mixing only, and is expected to be small. If e µ universality holds, Γ(ρ 0 µ + µ ) = Γ(ρ 0 e + e ) [j] See the Note on scalar mesons in the f 0 (500) Particle Listings. [k] See the Note on a 1 (1260) in the a 1 (1260) Particle Listings in PDG 06, Journal of Physics, G 33 1 (2006). [l] This is only an educated guess; the error given is larger than the error on the average of the published values. See the Particle Listings for details. [n] See the Note on non-qq mesons in the Particle Listings in PDG 06, Journal of Physics, G 33 1 (2006). [o] See the Note on the η(1405) in the η(1405) Particle Listings. [p] See the Note on the f 1 (1420) in the η(1405) Particle Listings. [q] See also the ω(1650) Particle Listings. [r] See the Note on the ρ(1450) and the ρ(1700) in the ρ(1700) Particle Listings. [s] See also the ω(1420) Particle Listings. [t] See the Note on f 0 (1710) in the f 0 (1710) Particle Listings in 2004 edition of Review of Particle Physics. Page 23 Created: 7/12/ :49
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