Feasibility of measuring the magnetic dipole moments of the charm baryons at the LHC using bent crystals

Abstract

In this paper we revisit the idea of measuring the magnetic dipole moments of the charm baryons and, in particular, of Λ + c by studying the spin precession induced by the strong effective magnetic field inside the channels of a bent crystal. We present a detailed sensitivity study showing the feasibility of such an experiment at the LHC in the coming years.

Electromagnetic dipole moments of charged baryons with bent crystals at the LHC

“…where Ω is the revolution frequency for the particle traversing the bent crystal, and the electric field described by the planar channel potential V (ρ) is Neglecting EDM contributions, the spin evolution resulting from Eqs. (4), (5), (9) and (10) is…”

Studies of various physics effects on an on-axis LHCD experiment using numerical tools

“…For spin-related analyses, this may be a serious limitation in the cancellation of some systematical uncertainties. A first setup (see Appendix 7.2), compatible with the LHCb detector, has been proposed to measure the electric and magnetic dipole moments of charmed charged baryons at LHC top energies [126,127,128]. A first bent crystal, located at 5σ from the center beam line, deflects the halo particles by about 150 µrad at about 100 meter upstream of the LHCb interaction region, in order to separate them from the circulating beam.…”

Feasibility of τ -lepton electromagnetic dipole moments measurement using bent crystal at the LHC

“…As it was shown in Ref. [28], the target depth is limited only by the increasing number of secondary particles produced in deeper targets. Assuming no nuclear effects the production rate of D + s mesons per one incident proton is…”

“…This study opens up the possibility of doing a single dedicated experiment to measure both the MDM of charmed baryons [27][28][29][30][31][32] and of τ lepton at the LHC.…”

“…In particular, in Ref. [28] the feasibility of measuring the MDM of the charm baryons Λ + c and Ξ + c at the LHC was addressed (see also details in Ref. [32]).…”