Details

Autor(en) / Beteiligte

• Appleby, R. B.
• Aslanides, E.
• Bachmann, S.
• Balagura, V.
• Ben-Haim, E.
• Betti, F.
• Bezshyiko, Ia
• Bifani, S.
• Buchanan, E.
• Cadeddu, S.
• Calabrese, R.
• Camboni, A.
• Cassina, L.
• Chatzikonstantinidis, G.
• Chrzaszcz, M.
• Chubykin, A.
• Cogoni, V.
• Couturier, B.
• Cruz Torres, M.
• Cunliffe, S.
• Dalseno, J.
• De Capua, S.
• De Paula, L.
• Dean, C. T.
• Decamp, D.
• Dendek, A.
• Dettori, F.
• Dey, B.
• Dufour, L.
• Dungs, K.
• Dzyuba, A.
• Ebert, M.
• Esen, S.
• Fernandez, G.
• Fitzpatrick, C.
• Frei, C.
• Gallas Torreira, A.
• Gallorini, S.
• García Pardiñas, J.
• Gushchin, E.
• Haines, S. C.
• Harrison, J.
• Hopchev, P. H.
• Humair, T.
• Khairullin, E.
• Kreps, M.
• Langenbruch, C.
• Lemaitre, F.
• Lesiak, T.
• Martins Tostes, D.
• Mathad, A.
• Meadows, B.
• Merk, M.
• Mitzel, D. S.
• Monteil, S.
• Morello, M. J.
• Müller, D.
• Müller, K.
• Nandi, A.
• Nguyen-Mau, C.
• Obraztsov, V.
• Oldeman, R.
• Pappagallo, M.
• Parkes, C.
• Penso, G.
• Pepe Altarelli, M.
• Petrolini, A.
• Popovici, B.
• Qian, W.
• Richards, S.
• Romero Vidal, A.
• Ronayne, J. W.
• Rotondo, M.
• Sadykhov, E.
• Sanchez Mayordomo, C.
• Schlupp, M.
• Schmidt, B.
• Schune, M. -H.
• Sciubba, A.
• Shcheglov, Y.
• Shevchenko, V.
• Szumlak, T.
• T’Jampens, S.
• Topp-Joergensen, S.
• Tourneur, S.
• Traill, M.
• Tresch, M.
• Valassi, A.
• de Vries, J. A.
• Wang, J.
• Whitehead, M.
• Wilkinson, G.
• Williams, M. P.
• Wormser, G.
• Wotton, S. A.
• Wyllie, K.
• Xu, Z.
• Yu, J.
• Zavertyaev, M.
• Zucchelli, S.

Titel

Observation of the Decays Λ b0 → χc1pK- and Λ b0 → χc2pK-

Ist Teil von

• Physical review letters, 2017-08, Vol.119 (6)

Ort / Verlag

United States: American Physical Society (APS)

Erscheinungsjahr

2017

Link zum Volltext

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• The first observation of the decays Λ$^0_b$ → $χ$c1$pK$- and Λ$^0_b$ → $χ$c2$pK$- is reported using a data sample corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment in $pp$ collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: $$\frac{\mathscr{B}(Λ^0_b→Χ_{c1}pK^-)}{\mathscr{B}(Λ^0_b→J/ψpK^-)}=0.242 ± 0.014 ± 0.013 ± 0.009$$ $$\frac{\mathscr{B}(Λ^0_b→Χ_{c2}pK^-)}{\mathscr{B}(Λ^0_b→J/ψpK^-)}= 0.248 ± 0.020 ± 0.014 ± 0.009$$ $$\frac{\mathscr{B}(Λ^0_b→Χ_{c2}pK^-)}{\mathscr{B}(Λ^0_b→Χ_{c1}pK^-)}= 1.02 ± 0.10 ± 0.02 ± 0.05$$ where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the $Χ_{c1}$ → $Jψγ$ and $Χ_{c2}$ → $Jψγ$ decays. Using both decay modes, the mass of the Λ$^0_b$ baryon is also measured to be $m$Λ$^0_b$ = 5619.44 ± 0.28 ± 0.26 MeV/$c$2, where the first and second uncertainties are statistical and systematic, respectively.