Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-31
Phys.Lett.B662:259-263,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex 10 pages with two figures
Scientific paper
10.1016/j.physletb.2008.03.025
We study baryon number violating nucleon decays induced by unparticle interactions with the standard model particles. We find that the lowest dimension operators which cause nucleon decays can arise at dimension 6 + (d_s-3/2) with the unparticles being a spinor of dimension d_s=d_\U +1/2. For scalar and vector unparticles of dimension d_\U, the lowest order operatoers arise at 6+d_\U and 7+d_\U dimensions,respectively. Comparing the spinor unparticle induced n \to O^s_\U and experimental bound on invisible decay of a neutron from KamLAND, we find that the scale for unparticle physics is required to be larger than 10^{10} GeV for d_\U < 2 if the couplings are set to be of order one. For scalar and vector unparticles, the dominant baryon number violating decay modes are n\to \bar \nu + O_\U (O^\mu_\U) and p \to e^+ + O_\U (O^\mu_\U). The same experimental bound puts the scales for scalar and vector unparticle to be larger than 10^{7} and 10^{5} GeV for d_\U <2 with couplings set to be of order one. Data on, p \to e^+ invisible, puts similar constraints on unparticle interactions.
He Xiao-Gang
Pakvasa Sandip
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