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Constraining axion by polarized prompt emission from gamma ray bursts.pdf

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Constraining axion by polarized prompt emission from gamma ray bursts

a r X i v : 0 7 0 8 .2 6 4 6 v 3 [ h e p - p h ] 2 1 A u g 2 0 0 7 arXiv: 0708.2646 [hep-ph] CERN-TH/2007-146 August 2007 Constraining axion by polarized prompt emission from gamma ray bursts A. Rubbiaa and A.S. Sakharova,b Abstract A polarized gamma ray emission spread over a sufficiently wide energy band from a strongly magnetized astrophysical object like gamma ray bursts (GRBs) offers an opportunity to test the hypothesis of invisible axion. The axionic induced dichroism of gamma rays at different energies should cause a misalignment of the polarization plane for higher energy events relative to that one for lower energies events resulting in the loss of statistics needed to form a pattern of the polarization signal to be recognized in a detector. According to this, any evidence of polarized gamma rays coming from an object with extended magnetic field could be interpreted as a constraint on the existence of the invisible axion for a certain parameter range. Based on reports of polarized MeV emission detected in several GRBs we derive a constraint on the axion-photon coupling. This constraint gaγγ ≤ 2.2 · 10?11 GeV?1 calculated for the axion mass ma = 10 ?3 eV is competitive with the sensitivity of CAST and becomes even stronger for lower masses. CERN-TH/2007-146 August 2007 a Swiss Institute of Technology, ETH-Zu?rich, 8093 Zu?rich, Switzerland b TH Division, PH Department, CERN, 1211 Geneva 23, Switzerland 1 The Peccei-Quinn (PQ) mechanism [1] remains perhaps the most natural solution to the CP problem in QCD. A new chiral UPQ(1) symmetry being spontaneously broken at some large energy scale, fa, and explicitly broken by the color anomaly at QCD scale would allow for the dynamical vanishing of the θ term and thus the restoration of the CP symmetry in strong interactions. The pseudo-scalar field, which drives the relaxation of the θ term to zero is called axion. The most important phenomenological property of this axion is its two-photon vertex interact