Leptophobic Z′ boson and parity-violating eD scattering
We study the impact of a leptophobic Z′ gauge boson on the C1q and C2q parameters that describe the low-energy, parity-violating electron-quark neutral current interaction. We complement previous work by including the penguin-like vertex corrections, thereby completing the analysis of one-loop calculation up to O(m^(2)_(q′)/M^(2)_(Z′)) terms. We analyze the sensitivity of these probes to the different couplings Z′u̅ q (q=u, c, t) and Z′d̅ q (q=d, s, b) in a model-independent way that can be applied to any specific Z′ scenario. We show that constraints from neutral kaon and heavy flavor studies preclude significant contributions from flavor nondiagonal couplings except for those involving top quarks. We apply our results to a light Z′ with flavor diagonal couplings to up or down quarks, a scenario proposed in the literature to explain the CDF W plus dijet anomaly. We find that such a particle would not affect the C_1q coefficients, but it would have a sizable impact on C_2q couplings that can be probed by future measurements of parity-violating deep inelastic scattering of polarized electrons off of deuterium.
Additional Information© 2013 American Physical Society. Received 25 December 2012; published 14 March 2013. We thank Sean Tulin and Martin Jung for useful discussionsand Sonny Mantry and John Ng for helpful conversations in formulating the initial phase of this analysis. This work was supported in part by DOE Contract No. DE-FG02-08ER41531 and the Wisconsin Alumni Research Foundation.
Published - Alonso_2013p055013.pdf