Stars as Laboratories for Fundamental Physics - MPP Theory Group

82 Chapter 2
Table 2.5. Constraints on low-mass particles from the observed duration
of helium burning in globular-cluster stars. Details are discussed in the
indicated sections of this book.
Particle property Dominant process Constraint a [Ref.]
Sect.
Yukawa coupling of Bremsstrahlung g S < 1.3×10 −14 [1]
scalar (vector) boson e + 4 He → 4 He + e + ϕ g V < 0.9×10 −14 3.5.5
ϕ to electrons
Yukawa coupling Compton g S < 4.3×10 −11 [1]
to baryons γ + 4 He → 4 He + ϕ g V < 3.0×10 −11 3.6.2
Photoproduction of Photoproduction σ < ∼ 3×10 −50 cm 2 [2]
X ◦ boson
γ + 4 He → 4 He + X ◦
Yukawa coupling of Compton g < 4.5×10 −13 [3]
pseudoscalar boson γ + e → e + a 3.2.6
a to electrons
Yukawa coupling of Compton g < 3.2×10 −13 [4]
“paraphoton” γ ′ γ + e → e + γ ′ 3.2.6
γγ coupling of Primakoff g aγ < 0.6×10 −10 [5]
pseudoscalar boson γ + 4 He → 4 He + a GeV −1 5.2.5
Neutrino dipole Plasmon decay µ eff < 1×10 −11 µ B [6]
moment γ → νν 6.5.6
a As derived in this book; may differ from the quoted references.
References:
1. Grifols and Massó (1986); Grifols, Massó, and Peris (1989).
2. van der Velde (1989); Raffelt (1988b).
3. Dicus et al. (1978, 1980); Georgi, Glashow, and Nussinov (1981);
Barroso and Branco (1982); Fukugita, Watamura, and Yoshimura (1982a,b);
Pantziris and Kang (1986); Raffelt (1986a).
4. Hoffmann (1987).
5. Raffelt (1986a); Raffelt and Dearborn (1987).
6. Sutherland et al. (1976); Fukugita and Yazaki (1987);
Raffelt and Dearborn (1988); Raffelt, Dearborn, and Silk (1989).