Evidence for a B0sπ± state

0470490 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš - Royon, C. … celkem 371 autorů
Evidence for a B0sπ± state.
Physical Review Letters. Roč. 117, č. 2 (2016), 1-8, č. článku 022003. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT(CZ) LG15047; GA MŠMT LM2015068
Institucionální podpora: RVO:68378271
Klíčová slova: DZERO * Batavia TEVATRON Coll * experimental results
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 8.462, rok: 2016

We report evidence for a narrow structure, X(5568), in the decay sequence X(5568)→Bs0π±, Bs0→J/ψϕ, J/ψ→μ+μ-, ϕ→K+K-. This is evidence for the first instance of a hadronic state with valence quarks of four different flavors. The mass and natural width of this state are measured to be m=5567.8±2.9(stat)-1.9+0.9(syst)  MeV/c2 and Γ=21.9±6.4(stat)-2.5+5.0(syst)  MeV/c2. If the decay is X(5568)→Bs*π±→Bs0γπ± with an unseen γ, m(X(5568)) will be shifted up by m(Bs*)-m(Bs0)∼49  MeV/c2. This measurement is based on 10.4  fb−1 of pp¯ collision data at s=1.96  TeV collected by the D0 experiment at the Fermilab Tevatron collider.

Trvalý link: http://hdl.handle.net/11104/0268110