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Symmetry/Asymmetry in Baryon Decay: Polarization, Hyperon Asymmetry Parameters and CP Violation

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A topical collection in Symmetry (ISSN 2073-8994). This collection belongs to the section "Physics".

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Editor

Prof. Dr. Xiongfei Wang

E-Mail Website
Guest Editor

School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
Interests: high-energy physics experiment; baryon pair production; CPV in hyperon decay

Topical Collection Information

Dear Colleagues,

The standard model (SM) of particle physics has been successfully proven in its ability to describe the fundamental particles and their interactions. However, there are still questions that the SM cannot answer. One of the key puzzles is why there is more matter than antimatter in the Universe. The violation of the charge-conjugation and parity (CP) symmetry could answer this big question. Although the existence of CP violation in kaon, beauty, and charm meson decays is firmly established, the evidence is not conclusive. Small violations of CP have not explained the large matter-antimatter asymmetry in the Universe beyond the SM expectation. The baryon decays provide a new laboratory to study the matter-antimatter asymmetry, and to probe the origin of our Universe by simultaneously analyzing the polarization and asymmetry parameters between the baryon and anti-baryon in electron-positron collider and B meson decay experiments.

Articles have been conceived to provide a new and updated answer to this request by collecting, organizing, and framing all the available data, both experimental and theoretical results on symmetry and asymmetry test, CP violation study, as well as polarization and asymmetry parameter observables in baryon or hyperon decays in a unique treatment.

Prof. Dr. Xiongfei Wang
Guest Editor

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Keywords

symmetry test
CP violation
polarization
baryon pair production
baryon asymmetry parameter
baryon decay
form factor

Published Papers (5 papers)

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2023

Jump to: 2022

16 pages, 2401 KB

Open AccessFeature PaperArticle

CP Violation in Baryon Decays at LHCb

by Xinchen Dai, Miroslav Saur, Yiduo Shang, Xueting Yang and Yanxi Zhang

Symmetry 2023, 15(2), 522; https://doi.org/10.3390/sym15020522 - 15 Feb 2023

Cited by 6 | Viewed by 3314

Abstract

Observations in astronomy suggest that our Universe contains an abundance of matter over antimatter, which can only be explained if the combined

C P

symmetry is violated. Studies of

C P

violation have driven the flavor physics with the aim of testing the [...] Read more.

Observations in astronomy suggest that our Universe contains an abundance of matter over antimatter, which can only be explained if the combined

C P

symmetry is violated. Studies of

C P

violation have driven the flavor physics with the aim of testing the Standard Model of particle physics and searching for physics beyond it.

C P

violation is discovered in strange, beauty, and charm meson systems; however, no conclusive sign of

C P

violation in baryon decays has been observed yet. This review summarizes

C P

violation studies performed by the LHCb experiment in charmless decays and rare decays of beauty baryons and singly Cabibbo-suppressed decays of charm baryons. A brief on prospects for future LHCb measurements is also discussed. Full article

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Figure 1

13 pages, 3435 KB

Open AccessArticle

CP Asymmetry in the Ξ Hyperon Sector

by Hao Liu, Jingxu Zhang and Xiongfei Wang

Symmetry 2023, 15(1), 214; https://doi.org/10.3390/sym15010214 - 11 Jan 2023

Cited by 13 | Viewed by 4860

Abstract

The Standard Model of particle physics has achieved great success in describing the fundamental particles and their interactions, but there are still some issues that have not been addressed yet. One of the key puzzles is to figure out why there is so [...] Read more.

C P

asymmetry. The

Ξ

hyperon with strangeness

S = - 2

, sometimes so-called the doubly-strange baryon, can provide key information to probe the asymmetry of the matter and antimatter. In this review, we discuss the studies of

C P

asymmetry in

Ξ

hyperon decay at E756, HyperCP and BESIII experiments. Full article

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Figure 1

2022

Jump to: 2023

8 pages, 450 KB

Open AccessArticle

Symmetry in Σ Hyperon Decay

by Yunlong Xiao, Xiao Chu and Liang Yan

Symmetry 2023, 15(1), 98; https://doi.org/10.3390/sym15010098 - 30 Dec 2022

Viewed by 2113

Abstract

CP symmetry violation is one of the fundamental requirements for having more matter than antimatter in our universe. However, the observed CP violation is not enough to explain the matter dominance. Searching for the new CP violation in the hyperon sector is therefore attracting people’s interests. In this article, we review the theoretical description of the spin one-half hyperon nonleptonic decay. In order to test the CP conservation, the asymmetry decay parameters might be compared between hyperon and antihyperon. The fixed-target experiments achieved the relevant measurements of the hyperon parameters but in the absence of the antihyperon results. The BESIII experiment with

e^{+} e^{-}

collision provided an entanglement environment to measure

Σ^{+}

and

{\bar{Σ}}^{-}

simultaneously. The important role of experimental inputs in CP violation evaluation is discussed in this paper, underlying the great potential of the future collider, which may allow us to reach the precision of the Standard Model predictions. Full article

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Figure 1

17 pages, 536 KB

Open AccessFeature PaperReview

Recent Measurements of Decay Asymmetry Parameter and CP Asymmetry for Charmed Baryon Decays at Belle

by Shi-Shuai Tang, Long-Ke Li, Xing-Yu Zhou and Cheng-Ping Shen

Symmetry 2023, 15(1), 91; https://doi.org/10.3390/sym15010091 - 29 Dec 2022

Cited by 2 | Viewed by 2422

Abstract

We review the recent results from the Belle experiment on the measurements of branching fractions and decay asymmetry parameters (

α

) for the hadronic weak decays of charmed baryons, including

Λ_{c}^{+} \to B + P

: [...] Read more.

We review the recent results from the Belle experiment on the measurements of branching fractions and decay asymmetry parameters (

α

) for the hadronic weak decays of charmed baryons, including

Λ_{c}^{+} \to B + P

Λ_{c}^{+} \to (Λ, Σ^{0}) h^{+}

(

h = π, K

) and

Λ_{c}^{+} \to Σ^{+} (π^{0}, η, η^{'})

;

Ξ_{c}^{0} \to B + P

Ξ_{c}^{0} \to Ξ^{-} π^{+}

;

Ξ_{c}^{0} \to B + V

Ξ_{c}^{0} \to Λ \bar{K}^{* 0}

Ξ_{c}^{0} \to Σ^{0} \bar{K}^{* 0}

, and

Ξ_{c}^{0} \to Σ^{+} K^{* -}

. In addition, we present an overview of the searches for

C P

violation via the

α

-induced

C P

asymmetry for

Λ_{c}^{+} \to (Λ, Σ^{0}) h^{+}

and

Ξ_{c}^{0} \to Ξ^{-} π^{+}

. Finally, we discuss the promising decay modes of

Ω_{c}^{0}

which can be measured in the near future and are indispensable in searching for

C P

violation in the charm sector. Full article

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Figure 1

7 pages, 342 KB

Open AccessReview

Recent Progress in

Λ_{c}^{+}

Decays

by Cong Geng and Xiaorong Zhou

Symmetry 2023, 15(1), 20; https://doi.org/10.3390/sym15010020 - 22 Dec 2022

Cited by 1 | Viewed by 1689

Abstract

Studying

Λ_{c}^{+}

decays provides important and complementary information to help understand the effects of non-perturbative quantum chromodynamics. Recently, many interesting results about

Λ_{c}^{+}

decays have been reported thanks to the high luminosity in Belle and dedicated operation at the [...] Read more.

Studying

Λ_{c}^{+}

decays provides important and complementary information to help understand the effects of non-perturbative quantum chromodynamics. Recently, many interesting results about

Λ_{c}^{+}

decays have been reported thanks to the high luminosity in Belle and dedicated operation at the

Λ_{c}^{+}

pair production threshold in BESIII. This paper reviews the recent progress in experimental measurements, containing sections about the hadronic weak decay, semileptonic decay, and decay asymmetry parameters and CP violation. Full article

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Figure 1

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Symmetry/Asymmetry in Baryon Decay: Polarization, Hyperon Asymmetry Parameters and CP Violation

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Topical Collection Information

Keywords

Published Papers (5 papers)

2023

Jump to: 2022

2022

Jump to: 2023

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