Examining a right-handed quark mixing matrix with -tags at the LHC
arXiv:1412.5587 · doi:10.1016/j.nuclphysb.2015.03.025
Abstract
Encouraged by a hint in a search for right-handed bosons at the LHC, we investigate whether the unitarity of a right-handed quark mixing matrix and the equality of the left- and right-handed quark mixing matrices could be tested at the LHC. We propose a particular test, involving counting the numbers of -tags in the final state, and simulate the test at the event level with Monte-Carlo tools for the forthcoming TeV LHC run. We find that testing unitarity with 20/fb will be challenging; our test successfully rejects unitarity if the right-handed quark mixing matrix is non-unitary, but only in particular cases. On the other hand, our test may provide the first opportunity to test the unitarity of a right-handed quark mixing matrix and with 3000/fb severely constrains possible departures from unitarity in the latter. We refine our previous work, testing the equality of quark mixing matrices, with full collider simulation. With 20/fb, we are sensitive to mixing angles as small as , and with 3000/fb, angles as small as , confirming our preliminary analysis. We briefly investigate testing the unitarity of the SM CKM matrix with a similar method by studying semileptonic production, concluding that systematics make it particularly difficult.
20 pages, 5 figures, matches version to appear in Nuclear Physics B
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