A  Aspden's particle numbers: then and now
  ID   what                                                 year          Aspden           he compared with                      today    off today  sig now sig then nearer
  P01  muon/electron mass ratio, three-charge muon + resona 1983     206.7683078       206.76835 +- 0.00011      206.7682827 +- 4.6e-6    0.121 ppm     5.46     0.38    now
  P02  muon/electron mass ratio, three-charge muon          1983        206.7687       206.76859 +- 0.00029      206.7682827 +- 4.6e-6     2.02 ppm     90.7     0.38   then
  P03  muon/electron mass ratio, H particle and pion quark  1980        206.7688       206.76859 +- 0.00029      206.7682827 +- 4.6e-6      2.5 ppm    112.0     0.72   then
  P04  muon anomaly (g-2)/2, two-state average              1984     0.001165918 0.0011659230 +- 0.0000000085  0.001165920715 +- 1.4e-10    -2.33 ppm     18.7     0.59    now
  P05  muon anomaly (g-2)/2, first version                  1983      0.00116589 0.001165895 +- 0.000000027  0.001165920715 +- 1.4e-10    -26.3 ppm    212.0     0.19   then
  P06  electron anomaly (g-2)/2, with gravity term          1981    0.0011596522 0.001159652200 +- 0.000000000040 0.00115965218059 +- 1.3e-13   0.0167 ppm    149.0      0.0   then
  P07  tau mass, 3^(7/12) x proton (printed 1781)           1986          1781.0                  1783 +- 3            1776.93 +- 0.09  2.29e+3 ppm     45.2     0.67   then
  P08  tau mass, revised ('real taon')                      1996         1776.51              1777.1 +- 0.5            1776.93 +- 0.09   -236.0 ppm     4.67      1.2    now
  P09  tau mass, revised again                              1998         1777.02            1777.05 +- 0.02            1776.93 +- 0.09     50.6 ppm      1.0      1.5   then
  P10  charged pion mass                                    1989        139.5678         139.5685 +- 0.0010       139.57039 +- 0.00018    -18.6 ppm     14.4      0.7   then
  P11  charged pion mass, 273.1262 m_e                      1980     139.5672014         139.5686 +- 0.0020       139.57039 +- 0.00018    -22.8 ppm     17.7      0.7   then
  P12  neutral pion mass, (1/2)43^(5/3) + 0.21875 m_e       1980         134.959         134.9645 +- 0.0074         134.9768 +- 0.0005   -132.0 ppm     35.6     0.74   then
  P13  neutral pion mass, his preferred lower end           1989          134.96         134.9642 +- 0.0038         134.9768 +- 0.0005   -124.0 ppm     33.6      1.1   then
  P13b neutral pion mass, upper end of his range            1989         134.976         134.9642 +- 0.0038         134.9768 +- 0.0005    -5.93 ppm      1.6      3.1    now
  P14  neutral pion lifetime                                1989         8.2e-17         8.7e-17 +- 0.4e-17        8.43e-17 +- 1.3e-18 -2.73e+4 ppm     1.77      1.3    now
  P15  charged pion lifetime (one muon effective)           1982         2.61e-8       2.551e-8 +- 0.026e-8       2.6033e-8 +- 5.0e-12  2.57e+3 ppm     13.4      2.3    now
  P16  charged kaon mass, 22-kaon optimum                   1989         493.633           493.667 +- 0.014           493.677 +- 0.015    -89.1 ppm     2.93      2.4   then
  P17  neutral kaon mass                                    1989         497.557                          -           497.611 +- 0.013   -109.0 ppm     4.15        -      -
  P18  J/psi, (sqrt6 - 3/2) x 3259 MeV                      1978          3095.0                       3095            3096.9 +- 0.006   -614.0 ppm    317.0        -   then
  P19  psi(2S), (g*:g) with 3259 and 2587 MeV               1978          3683.0                       3684          3686.097 +- 0.011   -840.0 ppm    282.0        -   then
  P20  Lambda, 2^(1/4) x proton                             1986     1115.799845                          -          1115.683 +- 0.006    105.0 ppm     19.5        -      -
  P21  Omega-, (tau + 3Q)/3^(1/3)                           1986          1674.0                          -            1672.45 +- 0.29    927.0 ppm     5.34        -      -
  P22  neutron mean life                                    1986           898.0                          -               878.3 +- 0.4  2.24e+4 ppm     49.2        -      -
  P23  neutron mean life (condition he favoured)            1981           921.8                  918 +- 14               878.3 +- 0.4  4.95e+4 ppm    109.0     0.27   then
  P24  neutron magnetic moment, -44/23                      1986    -1.913043478  -1.91304308 +- 0.00000054      -1.91304276 +- 4.5e-7    0.375 ppm      1.6     0.74   then
  P25  proton magnetic moment, 2:1 resonance mixture        1988     2.792847367 2.792847386 +- 0.000000063   2.79284734463 +- 8.2e-10  0.00801 ppm     27.3      0.3   then
  P26  deuteron binding energy                              1980         2.22464         2.22464 +- 0.00004    2.22456636208 +- 3.7e-7     33.1 ppm    199.0      0.0   then
  P27  W boson, 2(2N+1)^(4/3) x proton, N = 8               1983     82.02709952                  82 +- 2.4          80.3625 +- 0.0077  2.07e+4 ppm    216.0    0.011   then
  P28  Z boson, same formula on the graviton, N = 4         1984           96.86                         96           91.1879 +- 0.002  6.22e+4 ppm  2.84e+3        -   then
  P29  Z boson, f(2) - f(1)                                 1986         93.7935                93.8 +- 2.3           91.1879 +- 0.002  2.86e+4 ppm   1.3e+3   0.0028   then
  P30  Z boson, (g/omega)^3 g                               1989           92.59                92.6 +- 1.7           91.1879 +- 0.002  1.54e+4 ppm    701.0   0.0059   then
  P31  Z boson, revised: 92.59 - 2(0.785)                   1997           91.02                          -           91.1879 +- 0.002 -1.84e+3 ppm     83.9        -      -
  P32  Weinberg angle sin^2 = 2/9 vs 1 - m_W^2/m_Z^2        1986    0.2222222222             0.215 +- 0.014  0.223337298714 +- 0.00015 -4.99e+3 ppm     7.49     0.52    now
  P33  'Higgs' level, 122 x 1843 x 0.511 MeV                2000           114.9                      114.9             125.13 +- 0.11 -8.18e+4 ppm     93.0        -   then
  P34  top quark, mean of N = 29, 31 levels on the proton   2001          174.97               174.3 +- 5.1              172.6 +- 0.27  1.37e+4 ppm     8.78     0.13   then
  P35  top quark, mean of N = 13, 15 levels on the graviton 2001          174.78               174.3 +- 5.1              172.6 +- 0.27  1.26e+4 ppm     8.07    0.094   then
  Deuteron binding today = (m_p + m_n - m_d) in u x m_u c^2 (CODATA 2022) = 2.224566362 MeV
  P04, P05 today: Muon g-2 Collaboration 2025 world average (arXiv:2506.03069). P09: he quotes 1777.05 +- 0.02 MeV;
  the 0.02 is probably his misquote of the PDG uncertainty. P13 is the lower end of his 1989 range, which he called
  'the more representative'; P13b is the upper end.
  Of 27 numbers with a stated comparison value: within 2 sigma of the value he used, 24; within 2 sigma of today's value, 4
  All 36 numbers: within 2 sigma of today's value: P09, P13b, P14, P24
  'nearer': is his number nearer the value he used (then) or today's value (now)? then: 20, now: 7 -> now for P01, P04, P08, P13b, P14, P15, P32

B  Meson lifetime dilation (1983g): the lifetime in flight compared with relativity
  1    eq. (10): check against his printed 6.25% low at a = 0.5 and 0.56% low at a = 0.082    = 6.25%, 0.563%
  2    eq. (17), his final form for a < 0.5 (rebuilt from the scan): a tau/tau0 at a = 0.082 (he prints 0.9853) = 0.9852
  3    muon, gamma = 12.2 (Bailey & Picasso 1970: 26.37 +- 0.05 us against 26.69 relativistic) = measured -1.2%; eq.10 -0.563% (3.4 sig); eq.17 -1.48% (1.5 sig); relativity (6.4 sig)
  3    K+ at E/E0 = 3.38 (data he quotes: 0.9 +- 0.3% low)                                    = measured -0.9%; eq.10 -4.19% (11.0 sig); eq.17 -5.98% (17.0 sig); relativity (3.0 sig)
  3    K+ at E/E0 = 4.17 (same data)                                                          = measured -0.9%; eq.10 -3.23% (7.8 sig); eq.17 -5.35% (15.0 sig); relativity (3.0 sig)
  3    pion at E/E0 = 2.44 (he quotes 2.5% high, error 0.9%; he calls it 'a misfit')          = measured 2.5%; eq.10 -5.68% (9.1 sig); eq.17 -6.24% (9.7 sig); relativity (2.8 sig)
  3    muon at gamma = 29.33 (Bailey et al. 1977, as he quotes: low by 0.02 +- 0.09%)         = measured -0.02%; eq.10 -0.108% (0.98 sig); eq.17 -0.33% (3.4 sig); relativity (0.22 sig)

C  Electroweak numbers
  1    sin^2(theta_W): his 2/9; on-shell 1 - m_W^2/m_Z^2 today; difference in sigma (from m_W); see P32 = 0.222222; 0.223337; 7.49
  2    he compared 2/9 with sin^2 = 0.215 +- 0.014 (1985) and 0.23 +- 0.01 (1983); MS-bar value today is about 0.231 = 
  3    his 2000 level list (GeV), 1 to 10 substitute electrons                                = 22.6, 46.1, 68.7, 92.3, 114.9, 138.4, 161.0, 184.6, 207.2, 230.7
  4    the Higgs boson found in 2012, and his nearest level                                   = 125.13 GeV; 114.9 GeV (-8.18%)
  5    spacing of his levels near 125 GeV, and the Higgs mass uncertainty                     = 23.5 GeV; 0.11 GeV

D  Predictions made before the measurement
  1    a charged lepton at 5063 m_e, predicted from the mid-1960s, 'a firm prediction' in 1989b (GeV) = 2.5872
  2    pair threshold in e+e- collisions, 2 x 2.587 GeV                                       = 5.174
  3    pair cross section at 10.58 GeV (B factories) for a point-like spin-1/2 particle of charge e, nb = 0.757
  4    for comparison, tau pairs at 10.58 GeV, nb (same formula)                              = 0.772
  4b     for a spin-0 particle of the same mass and charge (beta^3/4 instead of beta(3 - beta^2)/2), nb = 0.129
  5    PDG listing: PETRA sequential-lepton limits 15.5-18 GeV; PLUTO 1981 excluded 4-14.5 GeV = 
  5b     no published search found that names 2.6 GeV explicitly; B factories made about a billion tau pairs = 
  6    other W states (1984, 1986)                                                            = 35.13 and 137.2 GeV; none is in the PDG listings
  6    other Z state (1986)                                                                   = 204.1 GeV; none is in the PDG listings
  6    proton-antiproton levels on the graviton (1984)                                        = 226.16 and 378.22 GeV; none is in the PDG listings

E  The neutron moment -44/23: how often does a simple fraction land this close?
  1    fractions p/q with q <= 46 between 1.90 and 1.93                                       = 20
  2    closest to today's |mu_n| = 1.91304276, and its distance                               = 44/23 (7.18e-7)
  3    chance that a value in 1.90-1.93 lies this close to one of them: count x 2 x distance / 0.03 = 0.000958
  4    chance of at least one such hit among the 36 numbers tested here                       = 0.0339
