Charmed baryon physics circa 2021

Cheng, H. P.

doi:10.1016/j.cjph.2022.06.021

Cited by 63 publications

(24 citation statements)

References 268 publications

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“…The study of charmed baryon decays is valuable for both understanding charmed-baryon dynamics and probing the effects of the weak and strong interactions. Since the ground state of the charmed baryons Λ + c was discovered [1], many efforts have been made to predict its branching fractions (BFs) into two-body hadronic final states, Λ + c → B n M [2][3][4][5][6][7], where B n and M denote the octet baryon and nonet meson states, respectively. However, progress has been hindered, due to the limited precision of experimental measurements [8] and difficulties in the theoretical treatment of non-perturbative strong interaction effects.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays $Λ_c^+ \rightarrow Σ^{0} K^+$ and $Σ^{+} K_{S}^0$

Collaboration¹,

Ablikim²,

Achasov³

et al. 2022

Preprint

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Based on a sample of 4.4 fb −1 of e + e − annihilation data collected in the energy region between 4.6 GeV and 4.7 GeV with the BESIII detector at BEPCII, two singly Cabibbo-suppressed decays) is measured to be 0.0361 ± 0.0073(stat.) ± 0.0005(syst.), and the ratio of) is measured to be 0.0106 ± 0.0031(stat.) ± 0.0004(syst.). After taking the world-average branching fractions of the reference decay channels, the branching fractions B(Λ + c → Σ 0 K + ) and B(Λ + c → Σ + K 0 S ) are determined to be (4.7±0.9(stat.)± 0.1(syst.) ± 0.3(ref.)) × 10 −4 and (4.8 ± 1.4(stat.) ± 0.2(syst.) ± 0.3(ref.)) × 10 −4 , respectively. The branching fraction of the Λ + c → Σ + K 0 S decay is measured for the first time.

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Section: Introductionmentioning

confidence: 99%

Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays $Λ_c^+ \rightarrow Σ^{0} K^+$ and $Σ^{+} K_{S}^0$

Collaboration¹,

Ablikim²,

Achasov³

et al. 2022

Preprint

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“…B ′ 2 (q, q 0 , d) = 9 + 3(q 0 d) 2 + (q 0 d) 4 9 + 3(qd) 2 + (qd) 4 , B ′ 3 (q, q 0 , d) = 225 + 45(q 0 d) 2 + 6(q 0 d) 4 + (q 0 d) 6 225 + 45(qd) 2 + 6(qd) 4 + (qd) 6 , B ′ 4 (q, q 0 , d) = 11025 + 1575(q 0 d) 2 + 135(q 0 d) 4 + 10(q 0 d) 6 + (q 0 d) 8 11025 + 1575(qd) 2 + 135(qd) 4 + 10(qd) 6 + (qd) 8 .…”

Section: Helicity Amplitudementioning

confidence: 99%

“…The charmed baryon Λ + c was discovered 40 years ago [1] and has been designated as the ground state of the charmed baryons with spin-parity J P = 1 2 + [2]. Recently, remarkable progress has been achieved in the study of hadronic weak decays of the charmed baryons, including absolute branching fraction (BF) measurements [3][4][5] and the re-ordering of the lifetime hierarchy [6][7][8][9]. The BESIII collaboration is presently one of the most active contributors to the measurements of the Λ + c decay parameters [10].…”

Section: Introductionmentioning

confidence: 99%

“…In the field of theoretical calculations, much effort has been made in recent years to evaluate the non-perturbative contributions to the charmed baryon hadronic decays [3][4][5]. Based on different theoretical approaches [13][14][15][16][17], the BFs and decay asymmetry parameters of the decays Λ + c → Λρ(770) + and Λ + c → Σ(1385)π are predicted.…”

Section: Introductionmentioning

confidence: 99%

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Partial wave analysis of the charmed baryon hadronic decay $Λ_c^+\toΛπ^+π^0$

Collaboration¹,

Ablikim²,

Achasov³

et al. 2022

Preprint

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Based on e + e − collision samples corresponding to an integrated luminosity of 4.4 fb −1 collected with the BESIII detector at center-of-mass energies between 4.6 GeV and 4.7 GeV, a partial wave analysis of the charmed baryon hadronic decay Λ + c → Λπ + π 0 is performed, and the decays Λ + c → Λρ(770) + and Λ + c → Σ(1385)π are studied for the first time. Making use of the world-average branching fraction B(Λ + c → Λπ + π 0 ), their branching fractions are determined to bewhere the first uncertainties are statistical, the second are systematic, and the third are from the uncertainties of the branching fractions B(Λ + c → Λπ + π 0 ) and B(Σ(1385) → Λπ). In addition, amplitudes determined from the partial wave analysis, the decay asymmetry parameters are measured to be α Λρ(770) + = −0.763 ± 0.053 ± 0.039, α Σ(1385) + π 0 = −0.917 ± 0.069 ± 0.046, and α Σ(1385) 0 π + = −0.789 ± 0.098 ± 0.056.Keywords: e + e − collision, Charmed baryon hadronic decay, Partial wave analysis ArXiv ePrint: 00000.00000 Contents 1 Introduction 1 2 BESIII experiment and Monte Carlo simulation 3 3 Event selection 5 4 Partial wave analysis 6 4.1 Helicity angle definitions 8 4.2 Helicity amplitude 10 4.3 Likelihood function construction and fit fraction 12 4.4 Nominal fit results 13 4.5 Decay asymmetry parameters 13 5 Systematic uncertainties 19 6 Summary 21The BESIII collaboration 27 [7] LHCb Collaboration, Precision measurement of the Λ + c , Ξ + c , and Ξ 0 c baryon lifetimes, Phys. Rev. D 100 (2019) 032001.[8] LHCb Collaboration, Measurement of the lifetimes of promptly produced Ω 0

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“…The Λ + c is the lightest charmed baryon, and the measurement of the properties of Λ + c provides key input for studying heavier charmed baryons [1] and bottom baryons [2,3], as well as understanding the dynamics of light quarks in the environment with a heavy quark [4]. However, there is no reliable phenomenological model calculation describing the complicated physics in charmed baryon decays, which strongly rely on experimental results.…”

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confidence: 99%

Measurement of the absolute branching fraction of the inclusive decay $$\Lambda _c^+ \rightarrow K_S^0X$$

Ablikim¹,

Ачасов²,

Adlarson³

et al. 2020

Eur. Phys. J. C

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We report the first measurement of the absolute branching fraction of the inclusive decay $$\Lambda _c^+ \rightarrow K_S^0X$$ Λ c + → K S 0 X . The analysis is performed using an $$e^+e^-$$ e + e - collision data sample corresponding to an integrated luminosity of 567 $$\hbox {pb}^{-1}$$ pb - 1 taken at $$\sqrt{s}$$ s = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored $${\bar{\Lambda }}_c^-$$ Λ ¯ c - decay modes and the double-tag technique, this absolute branching fraction is measured to be $${\mathcal {B}}(\Lambda _c^+ \rightarrow K_S^0X)=(9.9\pm 0.6\pm 0.4)\%$$ B ( Λ c + → K S 0 X ) = ( 9.9 ± 0.6 ± 0.4 ) % , where the first uncertainty is statistical and the second systematic. The relative deviation between the branching fractions for the inclusive decay and the observed exclusive decays is $$(18.7\pm 8.3)\%$$ ( 18.7 ± 8.3 ) % , which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.

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Charmed baryon physics circa 2021

Cited by 63 publications

References 268 publications

Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays $Λ_c^+ \rightarrow Σ^{0} K^+$ and $Σ^{+} K_{S}^0$

Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays $Λ_c^+ \rightarrow Σ^{0} K^+$ and $Σ^{+} K_{S}^0$

Partial wave analysis of the charmed baryon hadronic decay $Λ_c^+\toΛπ^+π^0$

Measurement of the absolute branching fraction of the inclusive decay $$\Lambda _c^+ \rightarrow K_S^0X$$

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