scholarly journals Decay properties of P-wave bottom baryons within light-cone sum rules

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
Hui-Min Yang ◽  
Hua-Xing Chen ◽  
Er-Liang Cui ◽  
Atsushi Hosaka ◽  
Qiang Mao
Keyword(s):  
Mass Spectrum ◽  
Ground State ◽  
Light Cone ◽  
Sum Rules ◽  
Decay Process ◽  
P Wave ◽  
Vector Mesons ◽  
Decay Properties ◽  
Partner State

Abstract We use the method of light-cone sum rules to study decay properties of P-wave bottom baryons belonging to the SU(3) flavor $$\mathbf {6}_F$$6F representation. In Cui et al. (Phys Rev D 99:094021, 2019) we have studied their mass spectrum and pionic decays, and found that the $$\varSigma _{b}(6097)$$Σb(6097) and $$\varXi _{b}(6227)$$Ξb(6227) can be well interpreted as P-wave bottom baryons of $$J^P = 3/2^-$$JP=3/2-. In this paper we further study their decays into ground-state bottom baryons and vector mesons. We propose to search for a new state $$\varXi _b({5/2}^-)$$Ξb(5/2-), that is the $$J^P = 5/2^-$$JP=5/2- partner state of the $$\varXi _{b}(6227)$$Ξb(6227), in the $$\varXi _b({5/2}^-) \rightarrow \varXi _b^{*}\rho \rightarrow \varXi _b^{*}\pi \pi $$Ξb(5/2-)→Ξb∗ρ→Ξb∗ππ decay process. Its mass is $$12 \pm 5$$12±5 MeV larger than that of the $$\varXi _{b}(6227)$$Ξb(6227).

scholarly journals Decay properties of P -wave charmed baryons from light-cone QCD sum rules

2017 ◽  
Vol 95 (9) ◽  
Author(s):  
Hua-Xing Chen ◽  
Qiang Mao ◽  
Wei Chen ◽  
Atsushi Hosaka ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Light Cone ◽  
Sum Rules ◽  
P Wave ◽  
Qcd Sum Rules ◽  
Charmed Baryons ◽  
Decay Properties

scholarly journals Strong coupling constants of doubly heavy baryons with vector mesons in QCD

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
T. M. Aliev ◽  
K. Şimşek
Keyword(s):  
Experimental Data ◽  
Strong Coupling ◽  
Light Cone ◽  
Particle Distribution ◽  
Sum Rules ◽  
Magnetic Coupling ◽  
Coupling Constants ◽  
Vector Mesons ◽  
Heavy Baryons ◽  
Light Vector

AbstractUsing the most general form of the interpolating current for baryons, the strong electric and magnetic coupling constants of light vector mesons $$ \rho $$ ρ and $$ K^* $$ K ∗ with doubly heavy baryons are computed within the light-cone sum rules. We consider 2- and 3-particle distribution amplitudes of the aforementioned vector mesons. The obtained results can be useful in the analysis of experimental data on the properties of doubly heavy baryons conducted at LHC.

scholarly journals Semileptonic decay of $$\varOmega _c^0 \rightarrow \varXi ^- l^+ \nu _l$$ from light-cone sum rules

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
Hui-Hui Duan ◽  
Yong-Lu Liu ◽  
Ming-Qiu Huang
Keyword(s):  
Decay Width ◽  
Light Cone ◽  
Sum Rules ◽  
Semileptonic Decay ◽  
Decay Channel ◽  
Branching Ratio ◽  
Form Factors ◽  
Weak Decay ◽  
Decay Process ◽  
Sum Rule

AbstractThe weak decay process of $$\varOmega _c$$ Ω c to $$\varXi $$ Ξ is calculated in the method of QCD light-cone sum rule. The decay width of $$\varOmega _c^0 \rightarrow \varXi ^- l^+ \nu _l$$ Ω c 0 → Ξ - l + ν l and its decay branching ratio are also calculated with the form factors from this work’s calculation. To the twist-6 distribution amplitudes, the form factors $$f_1=0.66\pm 0.02, f_2=-0.76\pm 0.03, g_1=0.06\pm 0.01$$ f 1 = 0.66 ± 0.02 , f 2 = - 0.76 ± 0.03 , g 1 = 0.06 ± 0.01 and $$g_2=-0.44\pm 0.01$$ g 2 = - 0.44 ± 0.01 are given at zero recoil point. The result of the semileptonic decay width of $$\varOmega _c^0 \rightarrow \varXi ^-l^+\nu _l$$ Ω c 0 → Ξ - l + ν l is $$\varGamma =(7.51\pm 0.36)\times 10^{-15}~\mathrm{{GeV}}$$ Γ = ( 7.51 ± 0.36 ) × 10 - 15 GeV , and the prediction of the decay branching ratio $$Br(\varOmega _c^0\rightarrow \varXi ^-l^+\nu _l)=(3.06\pm 0.15)\times 10^{-3}$$ B r ( Ω c 0 → Ξ - l + ν l ) = ( 3.06 ± 0.15 ) × 10 - 3 . These results fit well with other works, and the decay width and branching ratio are improved. This not too small branching ratio gives a good direction to explore this decay channel in the future experiments.

scholarly journals Analysis of the Pc(4312), Pc(4440), Pc(4457) and related hidden-charm pentaquark states with QCD sum rules

2020 ◽  
Vol 35 (01) ◽  
pp. 2050003 ◽  
Author(s):  
Zhi-Gang wang
Keyword(s):  
Mass Spectrum ◽  
Ground State ◽  
Operator Product Expansion ◽  
Sum Rules ◽  
Operator Product ◽  
Qcd Sum Rules ◽  
Type Formula ◽  
Vacuum Condensates

In this paper, we restudy the ground state mass spectrum of the diquark–diquark–antiquark-type [Formula: see text] pentaquark states with the QCD sum rules by carrying out the operator product expansion up to the vacuum condensates of dimension 13 in a consistent way. The predicted masses support assigning the [Formula: see text] to be the hidden-charm pentaquark state with [Formula: see text], assigning the [Formula: see text] to be the hidden-charm pentaquark state with [Formula: see text], [Formula: see text] or [Formula: see text], assigning the [Formula: see text] to be the hidden-charm pentaquark state with [Formula: see text] or [Formula: see text].

EXCLUSIVE PRODUCTION OF SOFT PIONS IN DIS

2009 ◽  
Vol 24 (35n37) ◽  
pp. 2931-2939
Author(s):  
V. M. BRAUN ◽  
D. YU. IVANOV ◽  
A. LENZ ◽  
A. PETERS
Keyword(s):  
Cross Sections ◽  
Light Cone ◽  
Sum Rules ◽  
Chiral Limit ◽  
P Wave ◽  
Threshold Region ◽  
S Wave ◽  
Exclusive Production ◽  
Model Independent ◽  
Momentum Transfer Dependence

We consider pion electroproduction close to threshold for Q2 in the region 1–10 GeV2 on a nucleon target. The momentum transfer dependence of the S-wave multipoles at threshold, E0+ and L0+, is calculated in the chiral limit using light-cone sum rules. Predictions for the cross sections in the threshold region, both for π0p and π+n channels, are given that include P-wave contributions that, as we argue, are model independent to a large extent. The results are compared with the SLAC E136 data on the structure function F2(W,Q2) in the threshold region.

scholarly journals Analysis of the triply heavy baryon states with the QCD sum rules

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Zhi-Gang Wang
Keyword(s):  
Mass Spectrum ◽  
Ground State ◽  
Operator Product Expansion ◽  
Sum Rules ◽  
Heavy Baryon ◽  
Operator Product ◽  
Qcd Sum Rules ◽  
Gluon Condensates ◽  
First Time ◽  
Vacuum Condensates

AbstractIn this article, we reexamine the mass spectrum of the ground state triply heavy baryon states with the QCD sum rules by carrying out the operator product expansion up to the vacuum condensates of dimension 6 in a consistent way and preforming a novel analysis. It is for the first time to take into account the three-gluon condensates in the QCD sum rules for the triply heavy baryon states.

scholarly journals Revisit the tetraquark candidates in the J/ψJ/ψ mass spectrum

2021 ◽  
Vol 36 (02) ◽  
pp. 2150014
Author(s):  
Zhi-Gang Wang
Keyword(s):  
Mass Spectrum ◽  
Excited States ◽  
Ground State ◽  
Sum Rules ◽  
Qcd Sum Rules ◽  
Text Type ◽  
State Formula ◽  
Broad Structure ◽  
Basic Constituent

In this paper, we introduce a relative [Formula: see text]-wave to construct the doubly-charm axialvector diquark operator, then take the doubly-charm axialvector (anti-)diquark operator as the basic constituent to construct the scalar and tensor tetraquark currents to study the scalar, axialvector and tensor fully-charm tetraquark states with the QCD sum rules. We observe that the ground state [Formula: see text]-type tetraquark states and the first radial excited states of the [Formula: see text]-type tetraquark states have almost degenerated masses, where the [Formula: see text] and [Formula: see text] stand for the diquark operators with and without the relative [Formula: see text]-wave, respectively, the broad structure above the [Formula: see text] threshold maybe consist of several diquark–antidiquark-type fully-charm tetraquark states.

scholarly journals A closer look at observables from exclusive semileptonic B → (π, ρ)ℓνℓ decays

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Aritra Biswas ◽  
Soumitra Nandi
Keyword(s):  
Mass Spectrum ◽  
Standard Model ◽  
Light Cone ◽  
Sum Rules ◽  
Form Factors ◽  
Invariant Mass Spectrum ◽  
New Physics ◽  
Differential Rate ◽  
Decay Modes ◽  
The Standard Model

Abstract This article analyses the available inputs in B → πℓνℓ and B → ρℓνℓ decays which include the measured values of differential rate in different q2-bins (lepton invariant mass spectrum), lattice, and the newly available inputs on the relevant form-factors from the light-cone sum rules (LCSR) approach. We define different fit scenarios, and in each of these scenarios, we predict a few observables in the standard model (SM). For example, $$ R(M)=\frac{\mathcal{B}\left(B\to M{\ell}_i{\nu}_{\ell_i}\right)}{\mathcal{B}\left(B\to M{\ell}_j{\nu}_{\ell_j}\right)},{R}_{\ell_j}^{\ell_i}(M)=\frac{\mathcal{B}\left(B\to {\ell}_i{\nu}_{\ell_i}\right)}{\mathcal{B}\left(B\to M{\ell}_j{\nu}_{\ell_j}\right)} $$ R M = B B → M ℓ i ν ℓ i B B → M ℓ j ν ℓ j , R ℓ j ℓ i M = B B → ℓ i ν ℓ i B B → M ℓ j ν ℓ j with M = π or ρ and ℓi,j = e, μ or τ. We also discuss the new physics (NP) sensitivities of all these observables and obtain bounds on a few NP Wilson coefficients in b → uτντ decays using the available data. We have noted that the data at present allows sizeable NP contributions in this mode. Also, we have predicted a few angular observables relevant to these decay modes.

scholarly journals Analysis of the Hidden-charm Tetraquark molecule mass spectrum with the QCD sum rules

2021 ◽  
pp. 2150107
Author(s):  
Zhi-Gang Wang
Keyword(s):  
Mass Spectrum ◽  
Ground State ◽  
Sum Rules ◽  
Qcd Sum Rules

In this paper, we investigate the mass spectrum of the ground state hidden-charm tetraquark molecular states without strange, with strange and with hidden-strange via the QCD sum rules in a comprehensive way and revisit the assignments of the [Formula: see text], [Formula: see text], [Formula: see text] states in the scenario of tetraquark molecular states consistently based on the QCD sum rules.

scholarly journals Identifying the Λb(6146)0 and Λb(6152)0 as D-Wave Bottom Baryons

Universe ◽  
2020 ◽  
Vol 6 (6) ◽  
pp. 86
Author(s):  
Qiang Mao ◽  
Hua-Xing Chen ◽  
Hui-Min Yang
Keyword(s):  
Quantum Chromodynamics ◽  
Heavy Quark ◽  
Light Cone ◽  
Sum Rules ◽  
Mass Splitting ◽  
Effective Theory ◽  
Heavy Quark Effective Theory ◽  
Qcd Sum Rules ◽  
Decay Properties ◽  
D Wave

We study the Λ b ( 6146 ) 0 and Λ b ( 6152 ) 0 recently observed by LHCb using the method of Quantum Chromodynamics (QCD) sum rules within the framework of heavy quark effective theory. Our results suggest that they can be interpreted as D-wave bottom baryons of J P = 3 / 2 + and 5 / 2 + respectively, both of which contain two λ -mode excitations. We also investigate other possible assignments containing ρ -mode excitations. We extract all the parameters that are necessary to study their decay properties when using the method of light-cone sum rules. We predict masses of their strangeness partners to be m Ξ b ( 3 / 2 + ) = 6.26 − 0.14 + 0.11 GeV and m Ξ b ( 5 / 2 + ) = 6.26 − 0.14 + 0.11 GeV with the mass splitting Δ M = m Ξ b ( 5 / 2 + ) − m Ξ b ( 3 / 2 + ) = 4.5 − 1.5 + 1.9 MeV, and propose to search for them in future CMS, EIC, and LHCb experiments.

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