Details

Autor(en) / Beteiligte

• Aslanides, E.
• Bachmann, S.
• Balagura, V.
• Ben-Haim, E.
• Berninghoff, D.
• Betancourt, C.
• van Beuzekom, M.
• Bezshyiko, Ia
• Blanc, F.
• Boettcher, T.
• Bondar, N.
• Bossu, F.
• Campora Perez, D. H.
• Cid Vidal, X.
• Cook, A.
• Coombs, G.
• Costa Sobral, C. M.
• Crocombe, A.
• Dall’Occo, E.
• De Miranda, J. M.
• Dembinski, H. -P.
• Dordei, F.
• Dosil Suárez, A.
• Dovbnya, A.
• Dujany, G.
• Dziewiecki, M.
• Easo, S.
• Evans, H. M.
• Fernandez Prieto, A.
• Fontana, M.
• Forshaw, D. C.
• Funk, W.
• Gascon, D.
• Gavardi, L.
• Golutvin, A.
• Grillo, L.
• Han, X.
• Henry, L.
• Heß, M.
• Jiang, F.
• John, M.
• Johnson, D.
• Jones, C. R.
• Kariuki, J. M.
• Kecke, M.
• Khanji, B.
• Klimaszewski, K.
• Kolpin, M.
• Komarov, I.
• Kotriakhova, S.
• Krokovny, P.
• Kuonen, A. K.
• Kvaratskheliya, T.
• Lanfranchi, G.
• Lefèvre, R.
• Lemos Cid, E.
• Lupato, A.
• Marin Benito, C.
• Martins Tostes, D.
• Meadows, B.
• Melnychuk, D.
• Merk, M.
• Milanes, D. A.
• Monteil, S.
• Morello, M. J.
• Moron, J.
• O’Hanlon, D. P.
• Oldeman, R.
• Pappenheimer, C.
• Pastore, A.
• Petridis, K.
• Petruzzo, M.
• Poluektov, A.
• Popov, A.
• Popov, D.
• Potterat, C.
• Rademacker, J. H.
• Rangel, M. S.
• Raven, G.
• Rodriguez Perez, P.
• Saitta, B.
• Sanmartin Sedes, B.
• Spaan, B.
• Storaci, B.
• Tomassetti, L.
• Tran, M. T.
• Vacca, C.
• Vazquez Gomez, R.
• Vazquez Regueiro, P.
• van Veghel, M.
• Verlage, T. A.
• Vieira, D.
• Vilasis-Cardona, X.
• Vollhardt, A.
• Wallace, R.
• Wilkinson, M.
• Wimberley, J.
• Wyllie, K.
• Zavertyaev, M.
• Zhang, Y.

Titel

Test of lepton universality with $B^0 → K^{0} ℓ^+ ℓ^-$ decays

Ist Teil von

• The journal of high energy physics, 2017-08, Vol.2017 (8)

Ort / Verlag

United States: Springer Berlin

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• A test of lepton universality, performed by measuring the ratio of the branching fractions of the $B^0 → K^{*0}μ^+μ^-$ and $B^0$ → $K^{*0}e^+e^-$ decays, $R_{K^{*0}}$, is presented. The $K^{*0}$ meson is reconstructed in the final state $K^+π^-$, which is required to have an invariant mass within 100 MeV/c2 of the known $K^*$ (892)0 mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb-1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q2, to be R K ∗ 0 = { 0.66 − + 0.07 0.11 ( s t a t ) ± 0.03 ( s y s t ) f o r 0.045 < q 2 < 1.1 G e V 2 / c 4 , 0.69 − + 0.07 0.11 ( s t a t ) ± 0.05 ( s y s t ) f o r 1.1 < q 2 < 6.0 G e V 2 / c 4 . The corresponding 95.4% confidence level intervals are [0.52, 0.89] and [0.53, 0.94]. The results, which represent the most precise measurements of $R_{K^{*0}}$ to date, are compatible with the Standard Model expectations at the level of 2.1–2.3 and 2.4–2.5 standard deviations in the two q2 regions, respectively.