We report the analysis of the three-body e+e-→BBπ±, BB∗π±, and B∗B∗π± processes, including the first observations of the Zb±(10610)→[BB∗+c.c.]± and Zb±(10650)→[B∗B∗]± transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of σ(e+e-→[BB∗+c.c.]±π)=[17.4±1.6(stat)±1.9(syst)] pb and σ(e+e-→[B∗B∗]±π)=[8.75±1.15(stat)±1.04(syst)] pb and set a 90% C.L. upper limit of σ(e+e-→[BB]±π)<2.9 pb. The results are based on a 121.4 fb-1 data sample collected with the Belle detector at a center-of-mass energy near the (10860) peak. © 2016 American Physical Society.

Prafulla Kumar Behera

Department Of Physics

Jim Libby

Atomic physics

A-center

B mesons

BELLE DETECTORS

Data sample

Final state

Three body

Upper limits

Physics

Fulltext

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Physical Review Letters

We report a new measurement of the e+e−→ ϒ(nS)π+π− (n = 1, 2, 3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We observe a new structure in the energy dependence of the cross sections; if described by a Breit-Wigner function its mass and width are found to be M=(10752.7±5.9−1.1+0.7)MeV/c2 and Γ=(35.5−11.3−3.3+17.6+3.9)MeV, where the first error is statistical and the second is systematic. The global significance of the new structure including systematic uncertainty is 5.2 standard deviations. We also find evidence for the e+e−→ ϒ (1S)π+π− process at the energy 10.52 GeV, which is below the BB¯ threshold. [Figure not available: see fulltext.] © 2019, The Author(s).

Journal of High Energy Physics

Observation of a new structure near 10.75 GeV in the energy dependence of the e + e − → ϒ (nS)π + π − (n = 1, 2, 3) cross sections

Observation of Zb (10610) and Zb (10650) Decaying to B Mesons

We report results on studies of the e+e-annihilation into three-body (nS)π+π-(n=1,2,3) final states including measurements of cross sections and the full amplitude analysis. The cross sections measured at s=10.866GeV and corrected for the initial state radiation are σ(e+e-→ (1S)π+π-)=(2.27±0.12±0.14)pb, σ(e+e-→ (2S)π+π-)=(4.07±0.16±0.45)pb, and σ(e+e-→ (3S)π+π-)=(1.46±0.09±0.16)pb. Amplitude analysis of the three-body (nS)π+π-final states strongly favors IG(JP)=1+(1+) quantum-number assignments for the two bottomonium-like Zb± states, recently observed in the (nS)π± and hb(mP)π± (m=1,2) decay channels. The results are obtained with a 121.4fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e-collider. © 2015 American Physical Society.

Physical Review D - Particles, Fields, Gravitation and Cosmology

Amplitude analysis of e+e-→ (nS)π+π-at s =10.866GeV

We report the observation of two narrow structures in the mass spectra of the π ±Υ(nS) (n=1, 2, 3) and π ±h b(mP) (m=1, 2) pairs that are produced in association with a single charged pion in Υ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M 1=(10607.2±2.0)MeV/c2, Γ 1=(18.4±2.4) MeV, and M 2=(10652.2±1.5)MeV/c2, Γ 2=(11. 5±2.2)MeV. The results are obtained with a 121.4fb -1 data sample collected with the Belle detector in the vicinity of the Υ(5S) resonance at the KEKB asymmetric-energy e +e - collider. © 2012 American Physical Society.

Journal	Data powered by TypesetPhysical Review Letters
Publisher	Data powered by TypesetAmerican Physical Society
ISSN	00319007
Open Access	No