Decays and spectrum of bottom and bottom strange mesons

Asghar, Ishrat; Masud, Bilal; Swanson, Eric S.; Akram, Faisal; Sultan, M. Atif

doi:10.1140/epja/i2018-12558-6

“…The B * s2 and B s1 states have properties consistent with the j q = 3/2 Pwave B s doublet. The predicted masses are roughly [30][31][32][33][34][35][36][37][38][39][40] MeV higher than the observed masses and the predicted decay widths are consistent with the measured widths. It is worth pointing out that for these states the radiative widths make a significant contribution to the total width.…”

Section: Statesupporting

confidence: 61%

“…We summarize the properties of these states in Table I where we quote the Particle Data Group (PDG) values, averaged over charge states [18]. At the same time, there have been numerous theoretical calculations of the properties of these states [8,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. In this brief note we will compare the predictions of a particular quark model [7,8] to the measured properties of the recently observed excited bottom mesons.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic assignments of the excited B-mesons

Godfrey

¹

,

Moats

²

2019

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Excited B-mesons have been observed by the D0, CDF, LHCb and CMS experiments. We use the predictions of the relativized quark model to make quark model spectroscopic assignments for these states. We identify the B * 2 (5747) and B1 (5721) as the B * 2 [1 3 P2] and B1[1P1] states and the B * s2 (5840) and Bs1(5830) as the B * s2 [1 3 P2] and Bs1[1P1]states. More information is needed to identify the BJ (5970) and BJ (5840) states and we suggest a number of measurements to make this identification: the determination of their J P quantum numbers and either confirming or ruling out their decays to the Bπ final state. With the current information available we believe it most likely that the BJ (5970) is the B * [2 3 S1] state, with the BJ (5840) needing confirmation.PACS numbers:

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“…We report the ratio of the production cross-section times branching fraction for the newly observed states relative to that of the B * 0 s2 meson. Predictions using a variety of methods have been made for masses and widths of states belonging to orbital or radial excitations ofbs states [12][13][14][15][16][17][18]. The spectroscopic notation, n 2S+1 L J , is commonly used to refer to these states, where n gives the radial quantum number, S the sum of the quark spins, L the orbital angular momentum of the quarks, and J the total angular momentum.…”

Section: Introductionmentioning

confidence: 99%

“…2 Different calculations give significantly different predicted widths for these states. In some cases they are close to 100 MeV or more [12][13][14] and in others can be less than 50 MeV [15][16][17]. Broad states are difficult to identify experimentally, however, because of large non-resonant continuum contributions.…”

Section: Introductionmentioning

confidence: 99%

Observation of new excited $${B} ^0_{s} $$ states

Aaij

¹

,

Beteta²,

Ackernley³

et al. 2021

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A structure is observed in the $${B} ^{\pm }{K} ^{\mp }$$ B ± K ∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9$$\,\text {fb} ^{-1}$$ fb - 1 . The structure is interpreted as the result of overlapping excited $${B} ^0_{s} $$ B s 0 states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to $${B} ^{\pm }{K} ^{\mp }$$ B ± K ∓ , are determined to be $$\begin{aligned} m_1&= 6063.5 \pm 1.2 \text { (stat)} \pm 0.8\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _1&= 26 \pm 4 \text { (stat)} \pm 4\text { (syst)}\,\text {Me}\text {V}, \\ m_2&= 6114 \pm 3 \text { (stat)} \pm 5\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _2&= 66 \pm 18 \text { (stat)} \pm 21\text { (syst)}\,\text {Me}\text {V}. \end{aligned}$$ m 1 = 6063.5 ± 1.2 (stat) ± 0.8 (syst) Me , Γ 1 = 26 ± 4 (stat) ± 4 (syst) Me , m 2 = 6114 ± 3 (stat) ± 5 (syst) Me , Γ 2 = 66 ± 18 (stat) ± 21 (syst) Me . Alternative values assuming a decay through $${B} ^{*\pm }{K} ^{\mp }$$ B ∗ ± K ∓ , with a missing photon from the $$B^{*\pm } \rightarrow B^{\pm }\gamma $$ B ∗ ± → B ± γ decay, which are shifted by approximately 45$$\,\text {Me}$$ Me V, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed $$B_{s2}^{*0}$$ B s 2 ∗ 0 state is determined to be $$0.87 \pm 0.15 \text { (stat)} \pm 0.19 \text { (syst)}$$ 0.87 ± 0.15 (stat) ± 0.19 (syst) .

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“…The thresholds for the charmonium and bottomunium systems are approximately 3.71 and 10.50 GeV, respectively [2]. Many charmonium and bottomonium states below thresholds have been experimentally observed and theoretically studied through various relativistic and non-relativistic potential models [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] and approaches like chiral perturbation theory [20], heavy quark effective field theory, lattice QCD [21][22][23][24][25][26][27][28][29][30][31], QCD sum rules [32][33][34][35][36][37][38], NRQCD [39][40][41], and dynamical equations based approaches like Bethe Salpeter and Dyson-Schwinger equations [41][42][43][44]. The heavy quarkonia were observed so far, still have many puzzles [17].…”

Section: Introductionmentioning

confidence: 99%

Mass Spectrum and Decay Constants of Heavy Quarkonia

Ahmad

¹

,

Hussain

²

,

Sultan

³

2021

PPASA

0

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In this paper, a non-relativistic potential model is used to find the solution of radial Schrodinger wave equation by using Crank Nicolson discretization for heavy quarkonia ( ̅, ̅). After solving the Schrodinger radial wave equation, the mass spectrum and hyperfine splitting of heavy quarkonia are calculated with and without relativistic corrections. The root means square radii and decay constants for S and P states of c ̅ and ̅ mesons by using the realistic and simple harmonic oscillator wave functions. The calculated results of mass, hyperfine splitting, root means square radii and decay constants agreed with experimental and theoretically calculated results in the literature.

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Decays and spectrum of bottom and bottom strange mesons

Cited by 29 publications

References 41 publications

Spectroscopic assignments of the excited B-mesons

Spectroscopic assignments of the excited B-mesons

Observation of new excited $${B} ^0_{s} $$ states

Mass Spectrum and Decay Constants of Heavy Quarkonia

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