Inspired by the latest experimental progress, we systematically study the Okubo-Zweig-Iizuka (OZI)-allowed two-body strong decay properties of 1$\textit{P}$-, 1$\textit{D}$-, 2$\textit{S}$-, and 2$\textit{P}$-wave $ \Lambda_c $ baryons within the $\textit{j}$-$\textit{j}$ coupling scheme in the framework of the quark pair creation model. The calculations indicate the following. (i) Taking the observed states $ \Lambda_c(2595)^+ $ and $ \Lambda_c(2625)^+ $ as the 1$\textit{P}$-wave $\textit{λ}$-mode states $ \Lambda_c|J^P=1/2^-,1\rangle_{\lambda} $ and $ \Lambda_c|J^P=3/2^-,1\rangle_{\lambda} $ , respectively, we can reproduce the experimental data well in theory. (ii) Combined with the measured mass and decay properties of $ \Lambda_c(2860)^+ $ , this excited state can be explained as the 1$\textit{D}$-wave $\textit{λ}$-mode state $ \Lambda_c|J^P=3/2^+,1\rangle_{\lambda\lambda} $ . (iii) The newly observed state $ \Lambda_c(2910)^+ $ may be assigned as one of the 1$\textit{P}$-wave $\textit{ρ}$-mode states $ \Lambda_c|J^P=3/2^-,2\rangle_{\rho} $ or $ \Lambda_c|J^P=5/2^-,2\rangle_{\rho} $ . Meanwhile, we notice that the partial decay width ratio between $ \Sigma_c\pi $ and $ \Sigma_c^*\pi $ for the two candidates is significantly different. Hence, experimental progress in this ratio measurement may elucidate the nature of $ \Lambda_c(2910)^+ $ . (iv) According to the properties of $ \Lambda_c(2765)^+ $ , we find that the 2$\textit{S}$-wave $\textit{λ}$-mode state $ \Lambda_{c1}|J^P=1/2^+,0\rangle_{\lambda} $ is a potential candidate. (v) The 2$\textit{P}$-wave $\textit{λ}$-mode state $ \Lambda_{c1}|J^P=3/2^-,1\rangle_{\lambda} $ is most likely to be a good assignment of the controversial state $ \Lambda_c(2940)^+ $ . Both the total decay width and partial decay ratio between $ pD^0 $ and $ \Sigma_c\pi $ are in good agreement with observations. (vi) In addition, for the missing $ \Lambda_c $ excitations, we obtain their strong decay properties and hope these are useful for future experimental exploration.

China

Yu-Bin Zhang

Li-Ye Xiao

Xian-Hui Zhong

Possible explanations of the observed Λ $_{c}$ resonances * Supported by the National Natural Science Foundation of China (12005013, 12175065, 12235018, 11947048)

We study a class of quantum states involving multiple entangled CFTs in AdS /CFT , associated with multi-boundary black hole geometries, and demonstrate that the Ryu-Takayanagi (RT) formula for entanglement entropy can be derived using only boundary CFT data. Approximating the OPE coefficients by their Gaussian moments within the 2D large-$\textit{c}$ CFT ensemble, we show that both the norm of the states and the entanglement entropies associated with various bipartitions — reproducing the expected bulk dual results — can be computed purely from the CFT. All $\textit{macroscopic geometric}$ structures arising from gravitational saddles emerge entirely from the universal statistical moments of the $\textit{microscopic algebraic}$ CFT data, revealing a statistical-mechanical mechanism underlying semiclassical gravity. We establish a precise correspondence between the CFT norm, the Liouville partition function with ZZ boundary conditions, and the exact gravitational path integral over 3D multi-boundary black hole geometries. For entanglement entropy, each RT phase arises from a distinct leading-order Gaussian contraction, with phase transitions — analogous to replica wormholes — emerging naturally from varying dominant statistical patterns in the CFT ensemble. Our derivation elucidates how the general mechanism behind holographic entropy, namely a boundary replica direction that elongates and becomes contractible in the bulk dual, is encoded explicitly in the statistical structure of the CFT data.

United States

Ning Bao

Hao Geng

Yikun Jiang

Ryu-Takayanagi formula for multi-boundary black holes from 2D large-$\textit{c}$ CFT ensemble

We propose the Regge trajectory relations for the fully heavy pentaquark $${P}_{cc\overline{c}bb }$$ utilizing both diquark and triquark Regge trajectory relations. Using these new relations, we discuss four series of Regge trajectories: the $\textit{ρ}$ -, $\textit{ρ}$ -, $\textit{λ}$ -, and $\textit{λ}$ -trajectories. We provide rough estimates for the masses of the $\textit{ρ}$ -, $\textit{ρ}$ -, $\textit{λ}$ -, and $\textit{λ}$ -excited states. Except for the $\textit{λ}$ -trajectories, the complete forms of the other three series of Regge trajectories for the pentaquark $${P}_{cc\overline{c}bb }$$ are lengthy and cumbersome. We show that the $\textit{ρ}$ -, $\textit{ρ}$ -, and $\textit{λ}$ -trajectories can not be obtained by simply imitating the meson Regge trajectories because mesons have no substructures. To derive these trajectories, pentaquark’s structure and substructure should be taken into consideration. Otherwise, the $\textit{ρ}$ -, $\textit{ρ}$ -, and $\textit{λ}$ -trajectories must rely solely on fitting existing theoretical or future experimental data. Consequently, the fundamental relationship between the slopes of the obtained trajectories and constituents’ masses and string tension will become unobvious, and the predictive power of the Regge trajectories would be compromised. Moreover, we show that the lengthy complete forms of the $\textit{ρ}$ -, $\textit{ρ}$ -, and $\textit{λ}$ -trajectories can be well approximated by the simple fitted formulas. Four series of Regge trajectories for the pentaquark $${P}_{cc\overline{c}bb }$$ all exhibit a behavior of $\textit{M}$ ~ $\textit{x}$ , where $\textit{x}$ = $\textit{n}$ , $\textit{n}$ , $\textit{l}$ , $\textit{l}$ , $\textit{N}$ , $\textit{N}$ , $\textit{L}$ , $\textit{L}$ . All four series of trajectories exhibit concave downward behavior in the ($\textit{M}$ , $\textit{x}$) plane.

He Song

Xin-Ru Liu

Jia-Qi Xie

Jiao-Kai Chen

$\textit{λ}$ and $\textit{ρ}$ Regge trajectories for the pentaquark $${P}_{cc\overline{c}bb }$$ in the diquark-triquark picture

In the Pati-Salam gauge symmetry <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>4</mn><msub><mo stretchy="false">)</mo><mi>c</mi></msub><mo>×</mo><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>2</mn><msub><mo stretchy="false">)</mo><mi>L</mi></msub><mo>×</mo><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>2</mn><msub><mo stretchy="false">)</mo><mi>R</mi></msub></math> (4-2-2, for short), the observed quarks and leptons of each family reside in the bi-fundamental representations (4,2,1) and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><mover accent="true"><mn>4</mn><mo stretchy="false">¯</mo></mover><mo>,</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo stretchy="false">)</mo></math>. There exist, however, the fundamental representations (4,1,1), (1,2,1), and (1,1,2) and their Hermitian conjugates, which show the presence, in principle, of yet to be discovered color triplets that carry electric charge <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>±</mo><mrow><mi>e</mi><mo>/</mo><mn>6</mn></mrow></math>, and color singlet particles with charges of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>±</mo><mrow><mi>e</mi><mo>/</mo><mn>2</mn></mrow></math>. These standard model charges are in full accord with the fact that the 4-2-2 model predicts the presence of a topologically stable, finite energy magnetic monopole that carries two quanta of Dirac magnetic charge, i.e., <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>4</mn><mi>π</mi><mo>/</mo><mi>e</mi></math>, as well as color magnetic charge that is screened beyond the quark confinement scale. The 4-2-2 model, therefore, predicts the existence of exotic baryons, mesons, and leptons that carry fractional (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>±</mo><mrow><mi>e</mi><mo>/</mo><mn>2</mn></mrow></math>) electric charges. Since their origin lies in the fundamental representations of 4-2-2, these exotic particles may turn out to be relatively light, in the TeV mass range or so. The 4-2-2 magnetic monopole mass depends on the 4-2-2 symmetry breaking scale, which is approximately 100 TeV.

Thomas W. Kephart

Qaisar Shafi

Magnetic monopoles and exotic states in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>4</mn><msub><mo stretchy="false">)</mo><mi>c</mi></msub><mo>×</mo><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>2</mn><msub><mo stretchy="false">)</mo><mi>L</mi></msub><mo>×</mo><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>2</mn><msub><mo stretchy="false">)</mo><mi>R</mi></msub></math>

The quarkonium production in association with a heavy-quark pair of the same flavor was found to play an important role in various production schemes and provide a distinctive signature that could be studied in experiment. Within the nonrelativistic QCD framework, we perform the first complete calculation of the hadroproduction process <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>g</mi><mi>g</mi><mo stretchy="false">→</mo><mi>J</mi><mo>/</mo><mi>ψ</mi><mo>+</mo><mi>c</mi><mover accent="true"><mi>c</mi><mo stretchy="false">¯</mo></mover></math> at the next-to-leading order (NLO) in the expansion of strong coupling constant <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>α</mi><mi>s</mi></msub></math>. The result tells us that the NLO corrections substantially enhance the color-singlet yield and alter the predicted polarization patterns and, hence, lead to a better agreement with experimental data across the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>p</mi><mi>T</mi></msub></math> spectrum. In contrast to charm-quark fragmentation, the fixed-order <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>J</mi><mo>/</mo><mi>ψ</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>c</mi><mover accent="true"><mi>c</mi><mo stretchy="false">¯</mo></mover></math> associated production channel displays a markedly different kinematic behavior. While the inclusion of this process greatly reduces the discrepancy between color-singlet theoretical prediction and experimental measurement, a residual gap of approximately 1 order of magnitude still remains.

Qi-Ming Feng

Cong-Feng Qiao

<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math> polarization and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>p</mi><mi>T</mi></msub></math> distribution in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>c</mi><mover accent="true"><mi>c</mi><mo stretchy="false">¯</mo></mover></math> associated hadroproduction at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="script">O</mi><mo stretchy="false">(</mo><msubsup><mi>α</mi><mi>s</mi><mn>5</mn></msubsup><mo stretchy="false">)</mo></math>

The LHCb collaboration amplitude analysis of the decays <math altimg='si32.svg'><mrow><msup><mi>B</mi><mo>+</mo></msup><mo>&#8594;</mo><msup><mi>D</mi><mo>+</mo></msup><msup><mi>D</mi><mo>&#8722;</mo></msup><msup><mi>K</mi><mo>+</mo></msup></mrow></math>, <math altimg='si33.svg'><mrow><msup><mi>B</mi><mo>+</mo></msup><mo>&#8594;</mo><msup><mi>D</mi><mo>&#8722;</mo></msup><msubsup><mi>D</mi><mi>s</mi><mo>+</mo></msubsup><msup><mi>&#960;</mi><mo>+</mo></msup></mrow></math>, and <math altimg='si34.svg'><mrow><msup><mi>B</mi><mn>0</mn></msup><mo>&#8594;</mo><msup><mover accent='true'><mi>D</mi><mo>&#175;</mo></mover><mn>0</mn></msup><msubsup><mi>D</mi><mi>s</mi><mo>+</mo></msubsup><msup><mi>&#960;</mi><mo>&#8722;</mo></msup></mrow></math> suggested the existence of two new resonant <math altimg='si35.svg'><mrow><msup><mi>J</mi><mi>P</mi></msup><mo linebreak='goodbreak'>=</mo><msup><mn>0</mn><mo>+</mo></msup></mrow></math> states with minimum quark content <math altimg='si21.svg'><mrow><mover accent='true'><mi>u</mi><mo>&#175;</mo></mover><mover accent='true'><mi>d</mi><mo>&#175;</mo></mover><mi>s</mi><mi>c</mi></mrow></math> and <math altimg='si23.svg'><mrow><mover accent='true'><mi>s</mi><mo>&#175;</mo></mover><mover accent='true'><mi>u</mi><mo>&#175;</mo></mover><mi>d</mi><mi>c</mi></mrow></math>/ <math altimg='si24.svg'><mrow><mover accent='true'><mi>s</mi><mo>&#175;</mo></mover><mover accent='true'><mi>d</mi><mo>&#175;</mo></mover><mi>u</mi><mi>c</mi></mrow></math>, named <math altimg='si1.svg'><msub><mi>T</mi><mrow><mi>c</mi><mi>s</mi><mn>0</mn></mrow></msub></math> and <math altimg='si2.svg'><msub><mi>T</mi><mrow><mi>c</mi><mover accent='true'><mi>s</mi><mo>&#175;</mo></mover><mn>0</mn></mrow></msub></math>, respectively. In this work, we used the diffusion Monte Carlo (DMC) method to compute the masses of those tetraquarks within the framework of the constituent quark model. We describe the systems as compact structures, not as diquark/antidiquark or meson/meson arrangements. In this context, compact means that we used directly the eigenvectors of the spin, color and flavor operators without any splitting and/or (re)combination of smaller units. This allows us to deduce the existence of two distinct bound configurations for each composition, corresponding to ground and excited flavor states. In both cases, the excited flavor states are the ones with masses comparable to the ones observed by LHCb. In addition, our analysis allows us to assign unambiguously an isospin value of <math altimg='si20.svg'><mi>I</mi></math>=1 to the experimentally obtained <math altimg='si1.svg'><msub><mi>T</mi><mrow><mi>c</mi><mi>s</mi><mn>0</mn></mrow></msub></math> tetraquark.

Spain

M.C. Gordillo

J. Segovia

Diffusion Monte Carlo calculation of compact <math altimg='si1.svg'><msub><mi>T</mi><mrow><mi>c</mi><mi>s</mi><mn>0</mn></mrow></msub></math> and <math altimg='si2.svg'><msub><mi>T</mi><mrow><mi>c</mi><mover accent='true'><mi>s</mi><mo>&#175;</mo></mover><mn>0</mn></mrow></msub></math> tetraquarks

A stringent test of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>C</mi><mi>P</mi></mrow></math> symmetry in hyperon decays is performed using <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>1.0</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>10</mn></mrow></msup><mtext> </mtext><mtext> </mtext><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math> events and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>2.7</mn><mo>×</mo><msup><mn>10</mn><mn>9</mn></msup><mtext> </mtext><mtext> </mtext><mi>ψ</mi><mo stretchy="false">(</mo><mn>3686</mn><mo stretchy="false">)</mo></math> events collected by the BESIII experiment. The <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>C</mi><mi>P</mi></math> asymmetry in the two-body nonleptonic weak decays <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi mathvariant="normal">Σ</mi><mo>+</mo></msup><mo stretchy="false">→</mo><mi>p</mi><msup><mi>π</mi><mn>0</mn></msup></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mover accent="true"><mi mathvariant="normal">Σ</mi><mo stretchy="false">¯</mo></mover><mo>−</mo></msup><mo stretchy="false">→</mo><mover accent="true"><mi>p</mi><mo stretchy="false">¯</mo></mover><msup><mi>π</mi><mn>0</mn></msup></math> is determined to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>A</mi></mrow><mrow><mi>C</mi><mi>P</mi></mrow></msub><mo>=</mo><mo>−</mo><mn>0.0118</mn><mo>±</mo><mn>0.0083</mn><mo stretchy="false">(</mo><mrow><mi>stat</mi></mrow><mo stretchy="false">)</mo><mo>±</mo><mn>0.0028</mn><mo stretchy="false">(</mo><mrow><mi>syst</mi></mrow><mo stretchy="false">)</mo></mrow></math>, consistent with <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>C</mi><mi>P</mi></math> conservation. The average decay parameter <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><mo stretchy="false">⟨</mo><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub><mo stretchy="false">⟩</mo></mrow><mo>=</mo><mo>−</mo><mn>0.9869</mn><mo>±</mo><mn>0.0011</mn><mo stretchy="false">(</mo><mrow><mi>stat</mi></mrow><mo stretchy="false">)</mo><mo>±</mo><mn>0.0016</mn><mo stretchy="false">(</mo><mrow><mi>syst</mi></mrow><mo stretchy="false">)</mo></mrow></math> represents the most precise measurement in the baryon sector to date. A model-independent analysis of the hyperon polarization is performed for the first time at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>J</mi><mo>/</mo><mi>ψ</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>ψ</mi><mo stretchy="false">(</mo><mn>3686</mn><mo stretchy="false">)</mo></math> resonances, revealing a clear sign reversal and offering new insight into SU(3) symmetry breaking and baryon internal structure. These results provide the most stringent constraints on <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>C</mi><mi>P</mi></math> violation in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Σ</mi></math> decays and establish a benchmark for future precision studies.

M. Ablikim

Russia

M.N. Achasov

Sweden

P. Adlarson

X.C. Ai

Germany

R. Aliberti

Italy

A. Amoroso

Q. An

Y. Bai

JINR

O. Bakina

Y. Ban

H.R. Bao

Poland

V. Batozskaya

Mongolia

K. Begzsuren

N. Berger

M. Berlowski

M. Bertani

D. Bettoni

F. Bianchi

E. Bianco

A. Bortone

I. Boyko

R.A. Briere

A. Brueggemann

H. Cai

M.H. Cai

X. Cai

A. Calcaterra

G.F. Cao

N. Cao

Türkiye

S.A. Cetin

X.Y. Chai

J.F. Chang

G.R. Che

Y.Z. Che

G. Chelkov

C. Chen

C.H. Chen

Chao Chen

G. Chen

H.S. Chen

H.Y. Chen

M.L. Chen

S.J. Chen

S.L. Chen

S.M. Chen

T. Chen

X.R. Chen

X.T. Chen

Y.B. Chen

Y.Q. Chen

Z.J. Chen

Z.K. Chen

South Korea

S.K. Choi

X. Chu

G. Cibinetto

F. Cossio

J.J. Cui

H.L. Dai

J.P. Dai

A. Dbeyssi

R.E. de Boer

D. Dedovich

C.Q. Deng

Z.Y. Deng

A. Denig

I. Denysenko

M. Destefanis

F. De Mori

B. Ding

X.X. Ding

Y. Ding

Y.X. Ding

J. Dong

L.Y. Dong

M.Y. Dong

X. Dong

M.C. Du

S.X. Du

Y.Y. Duan

Z.H. Duan

P. Egorov

G.F. Fan

J.J. Fan

Y.H. Fan

J. Fang

S.S. Fang

W.X. Fang

Y.Q. Fang

R. Farinelli

L. Fava

F. Feldbauer

G. Felici

C.Q. Feng

J.H. Feng

Y.T. Feng

M. Fritsch

C.D. Fu

J.L. Fu

Precision <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>C</mi><mi>P</mi></math> Symmetry Test and Polarization Analysis in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi mathvariant="normal">Σ</mi><mo>+</mo></msup></math> Decays

In this work, we apply the effective Lagrangian approach to investigate the two-body strong decay behaviors of the possible $ \Lambda_c K^* $ and $ \Sigma_c K^{(*)} $ molecules as predicted in our previous study [Phys. Rev. D 108 , 054011 (2023)]. Our results indicate that the decay width for the coupled $ \Sigma_c K / \Lambda_c K^* / \Sigma_c K^* $ molecule with $ I(J^P) = 1/2(1/2^-) $ is on the order of several MeV, with the $ D_s N $ channel being dominant. For the coupled $ \Lambda_c K^* / \Sigma_c K^* $ molecule with $ 1/2(1/2^-, 3/2^-) $ , the decay widths are on the order of tens of MeV, with the dominant channels being $ \Sigma_c K $ and $ \Sigma_c^* K $ , respectively. For the $ \Sigma_c K^* $ molecules with $ 1/2(1/2^-) $ , the decay width can reach one hundred MeV, with $ \Sigma_c K $ and $ \Lambda_c K $ being the dominant decay channels. The decay widths for the $ \Sigma_c K^* $ molecules with $ 1/2(3/2^-) $ and $ 3/2(1/2^-) $ are on the order of tens of MeV, with the dominant decay modes being $ \Sigma_c^* K $ and $ \Sigma_c K $ , respectively. The branching ratios for all the discussed channels exhibit slight dependence on the binding energies.

Jin-Yu Huo

Rui Chen

Exploring the two-body strong decay properties of the possible ${\boldsymbol\Lambda_{\boldsymbol c}\boldsymbol K^{*}}$ and ${\boldsymbol\Sigma_{\boldsymbol c}\boldsymbol K^{(*)}}$ molecules * Supported by the National Natural Science Foundation of China (12305139) and the Xiaoxiang Scholars Programma of Hunan Normal University

Large-scale organic liquid scintillator detectors are highly efficient in the detection of MeV-scale electron antineutrinos. These signal events can be detected through inverse beta decay on protons, which produce a positron accompanied by a neutron. A noteworthy background for antineutrinos coming from nuclear power reactors and from the depths of the Earth (geoneutrinos) is generated by ( $$\alpha ,\,n$$ ) reactions. In organic liquid scintillator detectors, $$\alpha $$ particles emitted from intrinsic contaminants such as $$^{238}$$ U, $$^{232}$$ Th, and $$^{210}$$ Pb/ $$^{210}$$ Po, can be captured on $$^{13}$$ C nuclei, followed by the emission of a MeV-scale neutron. Three distinct interaction mechanisms can produce prompt energy depositions preceding the delayed neutron capture, leading to a pair of events correlated in space and time within the detector. Thus, ( $$\alpha ,\,n$$ ) reactions represent an indistinguishable background in liquid scintillator-based antineutrino detectors, where their expected rate and energy spectrum are typically evaluated via Monte Carlo simulations. This work presents results from the open-source SaG4n software, used to calculate the expected energy depositions from the neutron and any associated de-excitation products. Also simulated is a detailed detector response to these interactions, using a dedicated Geant4-based simulation software from the JUNO experiment. An expected measurable $$^{13}$$ C $$(\alpha ,\,n)^{16}$$ O event rate and reconstructed prompt energy spectrum with associated uncertainties, are presented in the context of JUNO, however, the methods and results are applicable and relevant to other organic liquid scintillator neutrino detectors.

France

Thomas Adam

Kai Adamowicz

Pakistan

Shakeel Ahmad

Rizwan Ahmed

Sebastiano Aiello

Fengpeng An

United Kingdom

Costas Andreopoulos

Giuseppe Andronico

Nikolay Anfimov

Vito Antonelli

Tatiana Antoshkina

João Athayde Marcondes de André

Didier Auguste

Weidong Bai

Nikita Balashov

Andrea Barresi

Davide Basilico

Eric Baussan

Marco Beretta

Antonio Bergnoli

Nikita Bessonov

Daniel Bick

Lukas Bieger

Svetlana Biktemerova

Thilo Birkenfeld

Simon Blyth

Anastasia Bolshakova

Mathieu Bongrand

Matteo Borghesi

Dominique Breton

Augusto Brigatti

Riccardo Brugnera

Riccardo Bruno

Marcel Büchner

Antonio Budano

Jose Busto

Anatael Cabrera

Barbara Caccianiga

Hao Cai

Xiao Cai

Yanke Cai

Zhiyan Cai

Stéphane Callier

Steven Calvez

United Arab Emirates

Antonio Cammi

Chuanya Cao

Guofu Cao

Jun Cao

Yaoqi Cao

Rossella Caruso

Cédric Cerna

Vanessa Cerrone

Simulation of the background from $$^{13}$$ C $$(\alpha ,\,n)^{16}$$ O reaction in the JUNO scintillator