# Massless gauge bosons other than the photon.

@article{Dobrescu2005MasslessGB, title={Massless gauge bosons other than the photon.}, author={Bogdan A. Dobrescu}, journal={Physical review letters}, year={2005}, volume={94 15}, pages={ 151802 } }

Gauge bosons associated with unbroken gauge symmetries, under which all standard model fields are singlets, may interact with ordinary matter via higher-dimensional operators. A complete set of dimension-six operators involving a massless U(1) field, gamma('), and standard model fields is presented. The mu-->egamma(') decay, primordial nucleosynthesis, star cooling, and other phenomena set lower limits on the scale of chirality-flip operators in the 1-15 TeV range if the operators have…

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## References

SHOWING 1-10 OF 18 REFERENCES

### Nonexotic Neutral Gauge Bosons

- Physics
- 2003

We study theoretical and experimental constraints on electroweak theories including a new color-singlet and electrically-neutral gauge boson. We first note that the electric charges of the observed…

### Limits on particles of small electric charge.

- PhysicsPhysical review. D, Particles and fields
- 1991

Experimental limits on particles of small (not necessarily rational) electric charge are considered, and may be a natural consequence of extensions of the standard model incorporating an extra U(1) gauge group associated with a mirror universe'' sector.

### Present status of primordial nucleosynthesis after WMAP: results from a new BBN code

- Physics
- 2003

We report on the status of primordial nucleosynthesis in light of recent results on CMB anisotropies from WMAP experiment. Theoretical estimates for nuclei abundances, along with the corresponding…

### Neutron electric dipole moment from electric and chromoelectric dipole moments of quarks

- Physics
- 2001

Using QCD sum rules, we calculate the electric dipole moment of the neutron d_n induced by all CP violating operators up to dimension five. We find that the chromoelectric dipole moments of quarks…

### Lattice determination of the critical point of QCD at finite T and μ

- Physics
- 2002

Based on universal arguments it is believed that there is a critical point (E) in QCD on the temperature (T) versus chemical potential (μ) plane, which is of extreme importance for heavy-ion…

### Narrowing the window for millicharged particles by CMB anisotropy

- Physics
- 2004

We calculate the cosmic microwave background (CMB) anisotropy spectrum in models with millicharged particles of electric charge q∼10−6−10−1 in units of electron charge. We find that a large region of…