Bottomonium spectrum in the relativistic flux tube model

“…For the χ b2 (3P ) ref [75] employing modified GI model predicts 10539 MeV, the RFT model in ref. [19] predicts 10556 MeV, the RQM model in ref. [79] predicts 10550 MeV.…”

Section: Masses Of P Statesmentioning

confidence: 92%

“…Fresh study of these two states was conducted at BELL in 2019 by [18], the calculated masses found are 10885.3 ± 1.5 +2.2 −0.9 and 11000.0 +4.0 Ref. [19,23] suggest Υ(10860) as 5 3 S 1 bottomonium state, while [24] and [25] suggests it as an admixture of 5 3 S 1 and 6 3 D 1 , and 5 3 S 1 and 5 3 D 1 states. Υ (11020) has been suggested as an admixture of 6 3 S 1 and 5 3 D 1 by [25,24], also it has been well reproduced by other potential models that take into account coupled channel effects [26].…”

mentioning

confidence: 99%

Bottomonium spectroscopy using Coulomb plus linear (Cornell) potential

Kher¹,

Chaturvedi²,

Devlani³

et al. 2022

Preprint

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The coulomb plus linear (Cornell) potential is used to investigate the mass spectrum of bottomonium. Gaussian wave function is used in position and momentum space to estimate values of potential and kinetic energies, respectively. Based on our calculations, we study newly observed Υ (10860) as an admixture of 43 S 1 with 4 3 D 1 , and Υ (10753) as an admixture of 6 3 S 1 with 4 3 D 1 also, we try to assign Υ(11020) as a pure 43 D 1 bottomonium state. We also study the Regge trajectories in the (J, M 2 ) and (n r , M 2 ) planes to help prove our association. We estimate the pseudoscalar and vector decay constants, the radiative (Electric and Magnetic Dipole) transition rates, and the annihilation decay width for bottomonium states. PACS. XX.XX.XX No PACS code given 1 Introduction Bottomonium (bb meson) was discovered as Υ, Υ ′ and Υ ′′ by the E288 Collaboration at Fermilab in 1977, and were substantially studied at various e + e − storage rings[1,2]. In 1982, χ bJ (2P ) states and in 1983, χ bJ (2P ), (J = 1, 2, 3) states were discovered in E1 transition from Υ ′′ [3,4] and Υ ′ [5,6], respectively. In 1984, Υ(4S), Υ(5S) and Υ(6S) states were observed [7,8]. In 2008, after three decade of discovery of Υ(nS) resonance, the BaBar Collaboration found η b , the pseudoscalar partner of the triplet state Υ(1S)[9]. In 2012, the Belle collaboration reported the first evidence of the η b (2S) with mass 9999 ± 3.5 +2.8 −1.9 ,M eV /c 2 using h b (2P ) → γη b (2S) transition and first observation of h b (1P ) → γη b (1S) and h b (2P ) → γη b (1S) with mass 9402 ± 1.5 ± 1.8 M eV /c 2 [10]. In 2004, CLEO Collaboration presented the first evidence for the production of Υ(1S)(1D) states in the fourphoton cascade, such as in a two-photon cascade starting from the Υ(3S) → γχ b (2P J ), χ b (2P J ) → γΥ(1D) and then select events with two more subsequent photon transitions, Υ(1D) → γχ b (1P J ), χ b (1P J ) → γΥ(1S), followed by the Υ(1S) annihilation into either e + e − or µ + µ − [11]. In 2010, the BABAR Collaboration reported the observation of the J = 2 state of Υ(1 3 D J ) in the hadronic π + π − Υ(1S) decay channel, with Υ(1S) → e + e − or µ + µ − [12]. In 2011, BABAR Collaboration reported evidence for the h b (1P ) state in the decay Υ(3S) → π0h b (1P ), with data sample corresponds to 28 f b −1 of integrated luminosity at a center of mass energy of 10.355 GeV, the mass of the Υ(3S) resonance and in the same year, the Belle Collaboration reported the first observation of the spin-singlet bottomonium states h b (1P ) and h b (2P ) produced via e + e − → h b (nP )π + π − transition corresponds to 121.4 f b −1 of integrated luminosity near the peak of the Υ(5S) resonance at a center-of-mass energy √ s ∼ 10.865 GeV[13]. Again in 2011, ATLAS Collaboration observed the χ b (nP ) states, recorded by the ATLAS detector during the proton-proton collisions at the LHC, run at a center-of-mass energy √ s ∼ 7 T eV and these states were reconstructed through their radiative decays to Υ(1S, 2S) with Υ → µ + µ − . In addition to the mass pea...

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“…This new state, called Υ(10753) in PDG [10], can't be easily explained as a conventional bottomonium state as all the calculations of the mass spectrum of bottomonium family don't fit with its mass. Many different explanations of the Υ(10753) were given, both conventional [12][13][14][15] and exotic [16][17][18][19].…”

Section: The υ(10753) Casementioning

confidence: 99%

Bottomonium results and prospects at Belle II

Angioni¹

2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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The Belle II experiment at the SuperKEKB energy-asymmetric e + e − collider is an upgrade of the B factory facility at KEK in Tsukuba, Japan. The experiment began operation in 2019 and aims to record 50 times more data than its predecessor. Belle II is uniquely capable of studying the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First discovered by Belle, these now number in the dozens, and represent the emergence of a new category within quantum chromodynamics. We present recent results in new Belle II data, and the future prospects to explore both exotic and conventional bottomonium physics.

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Bottomonium spectrum in the relativistic flux tube model

Cited by 35 publications

References 108 publications

The eigenvalue of the confined potential

The eigenvalue of the confined potential

Bottomonium spectroscopy using Coulomb plus linear (Cornell) potential

Bottomonium results and prospects at Belle II

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