Measurement of the branching ratio $\Gamma(\Lambda_b^0 \rightarrow \psi(2S)\Lambda^0)/\Gamma(\Lambda_b^0 \rightarrow J/\psi\Lambda^0)$ with the ATLAS detector
- Aad, G.
- Ayoub, M.K.
- Bassalat, A.
- Becot, C.
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- Regie, J.B. de Vivie de
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- Escalier, M.
- Fayard, L.
- Fournier, D.
- Gkougkousis, E.L.
- Grivaz, J.-F.
- Guillemin, T.
- Hariri, F.
- Henrot-Versillé, S.
- Hrivnac, J.
- Iconomidou-Fayard, L.
- Kado, M.
- Lounis, A.
- Makovec, N.
- Morange, N.
- Nellist, C.
- Poggioli, L.
- Puzo, P.
- Renaud, A.
- Rousseau, D.
- Rybkin, G.
- Schaffer, A.C.
- Scifo, E.
- Serin, L.
- Simion, S.
- Tanaka, R.
- Tran, H.L.
- Zerwas, D.
- Zhang, Zhongkai
- Zhao, Y.
- Rahal, G.
- Barnovska, Z.
- Berger, N.
- Delmastro, M.
- Ciaccio, L. Di
- Elles, S.
- Hryn’ova, T.
- Jézéquel, S.
- Koletsou, I.
- Lafaye, R.
- Leveque, J.
- Massol, N.
- Sauvage, G.
- Sauvan, E.
- Simard, O.
- Todorov, T.
- Wingerter-Seez, I.
- Albrand, S.
- Brown, J.
- Collot, J.
- Crépé-Renaudin, S.
- Delsart, P.A.
- Gabaldon, C.
- Genest, M.H.
- Hostachy, J.Y.
- Ledroit-Guillon, F.
- Lleres, A.
- Lucotte, A.
- Malek, F.
- Monini, C.
- Stark, J.
- Trocmé, B.
- Wu, M.
- Alio, L.
- Barbero, M.
- Coadou, Y.
- Diaconu, C.
- Diglio, Sara
- Djama, F.
- Duccu, O.
- Feligioni, L.
- Gao, J.
- Hallewell, G.D.
- Hubaut, F.
- Kahn, S.J.
- Knoops, E. B. F. G.
- Guirriec, E. Le
- Liu, J.
- Liu, K.
- Madaffari, D.
- Mochizuki, K.
- Monnier, E.
- Muanza, S.
- Nagai, Y.
- Nagy, E.
- Pralavorio, P.
- Rozanov, A.
- Serre, T.
- Talby, M.
- Torres, R.E. Ticse
- Tiouchichine, E.
- Tisserant, S.
- Toth, J.
- Touchard, F.
- Vacavant, L.
- Boumediene, D.
- Busato, Emmanuel
- Calvet, D.
- Calvet, S.
- Donini, J.
- Dubreuil, E.
- Gilles, G.
- Gris, Ph.
- Liao, H.
- Madar, R.
- Pallin, D.
- Saez, S.M. Romano
- Santoni, C.
- Simon, D.
- Theveneaux-Pelzer, Timothée
- Vazeille, F.
- Yatsenko, E.
DOIAbstract
12 pages plus author list (28 pages total), 5 figures, 1 table, submitted to Phys. Lett. B. All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-08/ ; see paper for full list of authors.International audienceAn observation of the $\Lambda_b^0 \rightarrow \psi(2S) \Lambda^0$ decay and a comparison of its branching fraction with that of the $\Lambda_b^0 \rightarrow J/\psi \Lambda^0$ decay has been made with the ATLAS detector in proton--proton collisions at $\sqrt{s}=8\,$TeV at the LHC using an integrated luminosity of $20.6\,$fb$^{-1}$. The $J/\psi$ and $\psi(2S)$ mesons are reconstructed in their decays to a muon pair, while the $\Lambda^0\rightarrow p\pi^-$ decay is exploited for the $\Lambda^0$ bary...
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