T-violating triple-product correlations in hadronicbdecays

Abstract

We study T-violating triple-product asymmetries in the quark-level decay b → suū within the standard model (SM). We find that only two types of triple products are non-negligible. The asymmetry in p u · ( s u × sū) or pū · ( s u × sū) can be as large as about 5%. It can be probed in B → V 1 V 2 decays, where V 1 and V 2 are vector mesons. And the asymmetry in s b · ( p u × p s ) can be in the range 1%-3%. One can search for this signal in the decay Λ b → Λπ + π − or in B * → X s X, where X s and X then each decay into two mesons. All other triple-product asymmetries are expected to be small within the SM. This gives us new methods of searching for new physics.

T-violating triple-product correlations in charmless Λb decays

“…This agrees with the conclusions of Ref. [3], which neglects the masses of the final-state quarks (i.e. the limit m b → ∞ is implicitly assumed).…”

“…At first sight, this appears to contradict the results of Ref. [3], since no triple products involving two spins were found in the quark-level decay b → sūu. However, note that Y K is proportional to χ K , which is formally suppressed by 1/m b .…”

Measurement of matter–antimatter differences in beauty baryon decays

“…Decays of the Λ 0 b (bud) baryon to final states consisting of hadrons with no charm quarks are predicted to have non-negligible CP asymmetries in the SM, as large as 20% for certain three-body decay modes 13 . It is important to measure the size and nature of these CP asymmetries in as many decay modes as possible, to determine whether they are consistent with the CKM mechanism or, if not, what extensions to the SM would be required to explain them [14][15][16] .…”

First measurement of T -odd moments in D0→KS0Prasanth1, Libby2, Adachi3 et al. 2017Phys. Rev. D8020View full textAdd to dashboardCite

“…[6][7][8][9]. Such T -violation-sensitive measurements are complementary to direct probes of CP violation because of the differing dependence on the strong-phase difference between the contributing amplitudes [10].…”