Published January 1, 2021
| Version v1
Journal article
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Observation of a New Excited Beauty Strange Baryon Decaying to Xi(-)(b)pi(+)pi(-)
Creators
- Sirunyan, A. M.1
- Tumasyan, A.1
- Adam, W.2
- Andrejkovic, J. W.2
- Bergauer, T.2
- Chatterjee, S.2
- Dragicevic, M.2
- Del Valle, A. Escalante2
- Fruhwirth, R.
- Jeitler, M.
- Krammer, N.2
- Lechner, L.2
- Liko, D.2
- Mikulec, I2
- Pitters, F. M.2
- Schieck, J.
- Schofbeck, R.2
- Spanring, M.2
- Templ, S.2
- Waltenberger, W.2
- Waltenberger, W.2
- 1. Yerevan Phys Inst, Yerevan, Armenia
- 2. Inst Hochenergiephys, Vienna, Austria
Description
The Xi(-)(b)pi(+)pi(-) invariant mass spectrum is investigated with an event sample of proton-proton collisions at root s = 13 TeV, collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 140 fb(-1). The ground state Xi(-)(b) is reconstructed via its decays to J/psi Xi(-) and J/psi Lambda K-. A narrow resonance, labeled Xi(b)(6100)(-), is observed at a Xi(-)(b)pi(+)pi(-) invariant mass of 6100.3 +/- 0.2(stat) +/- 0.1(syst) +/- 0.6(Xi(-)(b)) MeV, where the last uncertainty reflects the precision of the Xi(-)(b) baryon mass. The upper limit on the Xi(b)(6100)(-) natural width is determined to be 1.9 MeV at 95% confidence level. The low Xi(b)(6100)(-) signal yield observed in data does not allow a measurement of the quantum numbers of the new state. However, following analogies with the established excited Xi(c) baryon states, the new Xi(b)(6100)(-) resonance and its decay sequence are consistent with the orbitally excited Xi(- )(b)baryon, with spin and parity quantum numbers J(P) = 3/2(-).
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