In the Standard Model of particle physics, the strength of the couplings of the b quark to the u and c quarks, /Vub/ and /Vcb/, are governed by the coupling of the quarks to the Higgs boson. Using data from the LHCb experiment at the Large Hadron Collider, the probability for the Λb0 baryon to decay into the pμ-vμ final state relative to the Λc+μ-vμ final state is measured. Combined with theoretical calculations of the strong interaction and a previously measured value of /Vcb/, the first /Vub/ measurement to use a baryonic decay is performed. This measurement is consistent with previous determinations of /Vub/ using B meson decays to specific final states and confirms the existing incompatibility with those using an inclusive sample of final states.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Determination of the quark coupling strength /Vub/ using baryonic decays. NATURE PHYSICS, 11(9), 743-747 [10.1038/nphys3415].

Determination of the quark coupling strength /Vub/ using baryonic decays

Borsato, M;CALVI, MARTA;CARNITI, PAOLO;CASSINA, LORENZO;GOTTI, CLAUDIO;KHANJI, BASEM;Martinelli, M;Petruzzo, M;
2015

Abstract

In the Standard Model of particle physics, the strength of the couplings of the b quark to the u and c quarks, /Vub/ and /Vcb/, are governed by the coupling of the quarks to the Higgs boson. Using data from the LHCb experiment at the Large Hadron Collider, the probability for the Λb0 baryon to decay into the pμ-vμ final state relative to the Λc+μ-vμ final state is measured. Combined with theoretical calculations of the strong interaction and a previously measured value of /Vcb/, the first /Vub/ measurement to use a baryonic decay is performed. This measurement is consistent with previous determinations of /Vub/ using B meson decays to specific final states and confirms the existing incompatibility with those using an inclusive sample of final states.
Articolo in rivista - Articolo scientifico
lhcb
English
27-lug-2015
2015
11
9
743
747
open
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Determination of the quark coupling strength /Vub/ using baryonic decays. NATURE PHYSICS, 11(9), 743-747 [10.1038/nphys3415].
File in questo prodotto:
File Dimensione Formato  
10281-90868.pdf

accesso aperto

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 366.25 kB
Formato Adobe PDF
366.25 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/90868
Citazioni
  • Scopus 145
  • ???jsp.display-item.citation.isi??? 106
Social impact