The prospect of charm quark magnetic moment determination
| Autor: | E. Kou, V.A. Kovalchuk, A. Stocchi, A. Yu. Korchin, M. Liul, A. S. Fomin, E. Niel, Patrick Robbe, Sergey Barsuk, A. Natochii |
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| Přispěvatelé: | Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11) |
| Rok vydání: | 2019 |
| Předmět: |
Particle physics
Physics and Astronomy (miscellaneous) FOS: Physical sciences lcsh:Astrophysics charmed baryon: magnetic moment 01 natural sciences 13.30.-a High Energy Physics - Experiment Charm quark High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) 13.88.+e 0103 physical sciences lcsh:QB460-466 [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] charmonium: decay lcsh:Nuclear and particle physics. Atomic energy. Radioactivity 010306 general physics Engineering (miscellaneous) bent crystal Particle Physics - Phenomenology Physics polarization Large Hadron Collider 61.85.+p Magnetic moment hep-ex 010308 nuclear & particles physics High Energy Physics::Phenomenology hep-ph 13.40.Em Lambda/c+: magnetic moment Lambda/c+: electric moment Charmed baryons Baryon charm: magnetic moment High Energy Physics - Phenomenology Electric dipole moment CERN LHC Coll [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] 14.20.Pt lcsh:QC770-798 High Energy Physics::Experiment decay: weak interaction Particle Physics - Experiment Order of magnitude Dimensionless quantity |
| Zdroj: | European Physical Journal C: Particles and Fields, Vol 80, Iss 5, Pp 1-20 (2020) Eur.Phys.J.C Eur.Phys.J.C, 2020, 80 (5), pp.358. ⟨10.1140/epjc/s10052-020-7891-0⟩ European Physical Journal |
| DOI: | 10.48550/arxiv.1909.04654 |
| Popis: | In this paper, we discuss the theoretical framework and the experimental measurements of the magnetic moment of the charm baryons. The $\Lambda_c^+$ magnetic moment is particularly interesting since it is equal to the magnetic moment of the charm quark. The measurements of the magnetic moments of other charm baryons, such as $\Xi_c$, allow to perform detailed spectroscopy studies. The magnetic moment of the $\Lambda_c$ can be determined using radiative charmonium decay and the present results show a tension with majority of theoretical predictions. As recently pointed out, the magnetic moment of the charm baryons can be directly measured using bent-crystal experiments at LHC. The possibility of precisely measure the magnetic moments of charm baryons needs precise measurement of their polarisation and weak decay parameters. In this paper, we revisit the formalism of the angular analysis needed for these measurements and make a detailed evaluation of initial polarisation of deflected $\Lambda_c$ baryons as a function of crystal orientation. We found a special orientation of the crystal that gives the opportunity to measure the $\Lambda_c$ dimensionless electric dipole moment almost with the same precision as its $g$-factor, which is more than an order of magnitude more efficient than suggested before. In conclusion, we stress the importance to perform precise measurements of initial polarisation and weak decay parameters of $\Lambda_c$ baryon to effectively compare the direct and from decay measurements of magnetic moments. Comment: 34 pages, 9 figures |
| Databáze: | OpenAIRE |
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