The first measurement of the magnitude of the CKM quark mixing matrix element |Vcb| using on-shell W-boson decays is presented. The measurement is made with t tbar events from pp collision data corresponding to an integrated luminosity of 140 fb-1 at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. A value of: |Vcb| = (50+11-14)x10^(-3) is measured, where the uncertainties have roughly equal contributions from the limited size of the data sample and from systematic effects. This is consistent with existing measurements made at much lower energy scales in B hadron decays. While the sensitivity does not yet rival that of previous determinations, this novel approach probes a very different physical situation, namely the rare hadronic t -> b bbar c decay at high momentum-transfer, rather than semileptonic B decays at low momentum-transfer.

Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Measurement of the |Vcb| element of the CKM matrix in t tbar decays with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(7) [10.1007/jhep07(2026)078].

Measurement of the |Vcb| element of the CKM matrix in t tbar decays with the ATLAS detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

Abstract

The first measurement of the magnitude of the CKM quark mixing matrix element |Vcb| using on-shell W-boson decays is presented. The measurement is made with t tbar events from pp collision data corresponding to an integrated luminosity of 140 fb-1 at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. A value of: |Vcb| = (50+11-14)x10^(-3) is measured, where the uncertainties have roughly equal contributions from the limited size of the data sample and from systematic effects. This is consistent with existing measurements made at much lower energy scales in B hadron decays. While the sensitivity does not yet rival that of previous determinations, this novel approach probes a very different physical situation, namely the rare hadronic t -> b bbar c decay at high momentum-transfer, rather than semileptonic B decays at low momentum-transfer.
2026
Pubblicato
Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Hadron-Hadron Scattering
Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Measurement of the |Vcb| element of the CKM matrix in t tbar decays with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(7) [10.1007/jhep07(2026)078].
Null, N; Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Acharya, Bs; Ack...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/474303
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