TY - JOUR

T1 - Examining a right-handed quark mixing matrix with b-tags at the LHC

AU - Fowlie, Andrew

AU - Marzola, Luca

N1 - Publisher Copyright:
© 2015 The Authors.

PY - 2015/5/1

Y1 - 2015/5/1

N2 - Encouraged by a hint in a search for right-handed W 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 b-tags in the final state, and simulate the test at the event level with Monte-Carlo tools for the forthcoming √s=13 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 30°, and with 3000/fb, angles as small as 7.5°, confirming our preliminary analysis. We briefly investigate testing the unitarity of the SM CKM matrix with a similar method by studying semileptonic tt- production, concluding that systematics make it particularly difficult.

AB - Encouraged by a hint in a search for right-handed W 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 b-tags in the final state, and simulate the test at the event level with Monte-Carlo tools for the forthcoming √s=13 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 30°, and with 3000/fb, angles as small as 7.5°, confirming our preliminary analysis. We briefly investigate testing the unitarity of the SM CKM matrix with a similar method by studying semileptonic tt- production, concluding that systematics make it particularly difficult.

UR - http://www.scopus.com/inward/record.url?scp=84961389117&partnerID=8YFLogxK

U2 - 10.1016/j.nuclphysb.2015.03.025

DO - 10.1016/j.nuclphysb.2015.03.025

M3 - Article

AN - SCOPUS:84961389117

SN - 0550-3213

VL - 894

SP - 588

EP - 601

JO - Nuclear Physics B

JF - Nuclear Physics B

ER -