We construct a dynamical coupled-channel approach to photon-induced $$J/\psi $$ production to search for the trace of the pentaquarks $$P_c.$$ In this approach, the considered open-charm intermediate states are $$\Lambda _c \bar{D}^{(*)}$$ and $$\Sigma _c \bar{D}^{(*)}.$$ Scattering amplitude involving $$\Lambda _c \bar{D}^{(*)},$$ $$\Sigma _c \bar{D}^{(*)}$$ and $$J/\psi p$$ interactions is calculated from solving a set of coupled-channel integral equations. The coupled-channel interaction potentials are generated from one-boson-exchange. The pentaquarks $$P_c$$ are dynamically generated from the coupled-channel interactions. Moreover, the background contributions to the $$P_c$$ signals are assumed to be the Pomeron exchange and $$\sigma $$ exchange. We analyze the total and differential cross sections of $$J/\psi $$ photoproduction measured by the GlueX and $$J/\psi $$ -007 experiments. It is found that both $$\sigma $$ exchange and open-charm state rescattering have contributions in describing the total and differential cross section. The total cross section gets enhanced due to the open-charm state rescattering in the pentaquark production regions, and is of order 1 nb or smaller.

China

Xu Zhang

Pentaquarks $$P_c$$ in a dynamical coupled-channel approach of $$\gamma p \rightarrow J/\psi p$$ reaction

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

Germany

Kai Adamowicz

Pakistan

Shakeel Ahmad

Rizwan Ahmed

Italy

Sebastiano Aiello

Fengpeng An

United Kingdom

Costas Andreopoulos

Giuseppe Andronico

Russia

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

Jinfan Chang

Taiwan

Yun Chang

Thailand

Auttakit Chatrabhuti

Chao Chen

Guoming Chen

Jiahui Chen

Jian Chen

Jing Chen

Junyou Chen

Pingping Chen

Shaomin Chen

Shiqiang Chen

Xin Chen

Yiming Chen

Yixue Chen

Yu Chen

Ze Chen

Zhangming Chen

Zhiyuan Chen

Jie Cheng

Yaping Cheng

Yu Cheng

Alexander Chepurnov

Alexey Chetverikov

Davide Chiesa

Brazil

Pietro Chimenti

Po-Lin Chou

Ziliang Chu

Artem Chukanov

Gérard Claverie

Catia Clementi

Belgium

Barbara Clerbaux

Claudio Coletta

Selma Conforti Di Lorenzo

Simon Csakli

Chenyang Cui

United States

Olivia Dalager

Christophe Taille

Zhi Deng

Ziyan Deng

Xiaoyu Ding

Xuefeng Ding

Yayun Ding

Bayu Dirgantara

Carsten Dittrich

Sergey Dmitrievsky

David Doerflinger

Dmitry Dolzhikov

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

The Efimov effect is an intriguing three-body quantum phenomenon. Searching for Efimov states within the realms of nuclear and hadronic physics presents a challenge due to the inherent inability of natural physical systems to exhibit adjustable two-body scattering lengths. In this study, we examine the potential existence of Efimov states in the $\textit{D}$ $\textit{D}$ $\textit{D}$ and $\textit{DD}$ $\textit{D}$ three-hadron systems. Utilizing a pionless effective field theory framework, we determine that the presence of Efimov states in the spectrum of the $\textit{D}$ $\textit{D}$ $\textit{D}$ system is contingent upon the existence of an ($\textit{I, J}$) = (1$\textit{,}$ 2) $\textit{D}$ $\textit{D}$ two-body bound system. If only the $$ {T}_{cc}^{+} $$ and its heavy quark spin partner $$ {T}_{cc}^{\ast +} $$ exist while there is no near-threshold pole in all other $\textit{S}$-wave $\textit{D}$ $\textit{D}$ scattering amplitudes, no Efimov effect is expected in the $\textit{D}$ $\textit{D}$ $\textit{D}$ systems.

Hai-Long Fu

Yong-Hui Lin

Feng-Kun Guo

Hans-Werner Hammer

Ulf-G. Meißner

Georgia

Akaki Rusetsky

Exploring Efimov states in $\textit{D}$

Scattering amplitudes involving three-particle scattering processes are investigated within the isobar approximation which respects constraints from two- and three-body unitarity. The particular system considered is the <math><msup><mi>D</mi><mn>0</mn></msup><msup><mi>D</mi><mrow><mo>*</mo><mo>+</mo></mrow></msup><mo>−</mo><msup><mi>D</mi><mo>+</mo></msup><msup><mi>D</mi><mrow><mo>*</mo><mn>0</mn></mrow></msup></math>, where the <math><msup><mi>D</mi><mrow><mo>*</mo><mo>+</mo></mrow></msup></math> <math><mo>(</mo><msup><mi>D</mi><mrow><mo>*</mo><mn>0</mn></mrow></msup><mo>)</mo></math> enters as a <math><mi>p</mi></math>-wave <math><msup><mi>D</mi><mo>+</mo></msup><msup><mi>π</mi><mn>0</mn></msup></math> or <math><msup><mi>D</mi><mn>0</mn></msup><msup><mi>π</mi><mo>+</mo></msup></math> (<math><msup><mi>D</mi><mn>0</mn></msup><msup><mi>π</mi><mn>0</mn></msup></math> or <math><msup><mi>D</mi><mo>+</mo></msup><msup><mi>π</mi><mo>−</mo></msup></math>) resonance. The interaction potentials in the coupled-channel <math><msup><mi>D</mi><mn>0</mn></msup><msup><mi>D</mi><mrow><mo>*</mo><mo>+</mo></mrow></msup><mo>−</mo><msup><mi>D</mi><mo>+</mo></msup><msup><mi>D</mi><mrow><mo>*</mo><mn>0</mn></mrow></msup></math> system contain the <math><mi>σ</mi></math>, <math><mi>ρ</mi></math>, <math><mi>ω</mi></math>, and <math><mi>π</mi></math>-exchange. The analytic continuation of the amplitudes across the three-body unitary cuts is investigated to search for poles on the unphysical Riemann sheets. Associated with an unstable particle <math><msup><mi>D</mi><mrow><mo>*</mo><mo>+</mo></mrow></msup></math> <math><mo>(</mo><msup><mi>D</mi><mrow><mo>*</mo><mn>0</mn></mrow></msup><mo>)</mo></math> is a complex two-body unitarity cut, through which one can further analytically continue into another unphysical Riemann sheet. Dynamical singularities emerged from the <math><mi>π</mi></math>-exchange potential are stressed. The pole generated from the <math><msup><mi>D</mi><mn>0</mn></msup><msup><mi>D</mi><mrow><mo>*</mo><mo>+</mo></mrow></msup><mo>−</mo><msup><mi>D</mi><mo>+</mo></msup><msup><mi>D</mi><mrow><mo>*</mo><mn>0</mn></mrow></msup></math> interaction and its line shape in <math><msup><mi>D</mi><mn>0</mn></msup><msup><mi>D</mi><mn>0</mn></msup><msup><mi>π</mi><mo>+</mo></msup></math> break-up production are in agreement with double-charmed tetraquark <math><msubsup><mi>T</mi><mrow><mi>c</mi><mi>c</mi></mrow><mo>+</mo></msubsup></math> observed by the LHCb Collaboration.

Relativistic three-body scattering and the <math><msup><mi>D</mi><mn>0</mn></msup><msup><mi>D</mi><mrow><mo>*</mo><mo>+</mo></mrow></msup><mo>−</mo><msup><mi>D</mi><mo>+</mo></msup><msup><mi>D</mi><mrow><mo>*</mo><mn>0</mn></mrow></msup></math> system

The three-body systems <math><mi>η</mi><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup></math>, <math><mi>π</mi><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup></math>, and <math><mi>K</mi><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup></math> are further investigated within the framework of fixed-center approximation, where <math><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup></math> is treated as the fixed-center, corresponding to the possible scalar meson <math><msub><mi>a</mi><mn>0</mn></msub><mo>(</mo><mn>1780</mn><mo>)</mo></math> or the tensor meson <math><msubsup><mi>f</mi><mn>2</mn><mo>′</mo></msubsup><mo>(</mo><mn>1525</mn><mo>)</mo></math>. The interactions between <math><mi>η</mi></math>, <math><mi>π</mi></math>, <math><mi>K</mi></math>, and <math><msup><mi>K</mi><mo>*</mo></msup></math> are taken from the chiral unitary approach. The resonance structures appear in the modulus squared of the three-body scattering amplitude and suggest that <math><mi>η</mi><mo>/</mo><mi>π</mi><mo>/</mo><mi>K</mi><mo>−</mo><mo>(</mo><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup><msub><mo>)</mo><mrow><msub><mi>a</mi><mn>0</mn></msub><mo>(</mo><mn>1780</mn><mo>)</mo><mo>/</mo><msubsup><mi>f</mi><mn>2</mn><mo>′</mo></msubsup><mo>(</mo><mn>1525</mn><mo>)</mo></mrow></msub></math> hadron state can be formed. By scattering the <math><mi>η</mi></math> meson on the fixed-center <math><mo>(</mo><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup><msub><mo>)</mo><mrow><msub><mi>a</mi><mn>0</mn></msub><mo>(</mo><mn>1780</mn><mo>)</mo></mrow></msub></math>, it is found that there is a distinct peak around 2100 MeV, as shown in the modulus squared of the three-body scattering amplitude, which can be associated with the meson <math><mi>π</mi><mo>(</mo><mn>2070</mn><mo>)</mo></math>. For the scattering of the <math><mi>η</mi></math> meson on the <math><mo>(</mo><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup><msub><mo>)</mo><mrow><msubsup><mi>f</mi><mn>2</mn><mo>′</mo></msubsup><mo>(</mo><mn>1525</mn><mo>)</mo></mrow></msub></math>, a resonance structure around 1890 MeV is found and it can be associated with the <math><msub><mi>η</mi><mn>2</mn></msub><mo>(</mo><mn>1870</mn><mo>)</mo></math> meson. Other resonance structures are also found and can be associated with <math><msub><mi>π</mi><mn>2</mn></msub><mo>(</mo><mn>1880</mn><mo>)</mo></math> and <math><mi>η</mi><mo>(</mo><mn>2010</mn><mo>)</mo></math>.

Qing-Hua Shen

Xiang Liu

Ju-Jun Xie

Dynamically generated states from the <math><mi>η</mi><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup></math>, <math><mi>π</mi><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup></math>, and <math><mi>K</mi><msup><mi>K</mi><mo>*</mo></msup><msup><mover><mi>K</mi><mo>¯</mo></mover><mo>*</mo></msup></math> systems within the fixed-center approximation

The existence of light sterile neutrinos is a long-standing question in particle physics. Several experimental “anomalies” might be explained by introducing eV mass scaled light sterile neutrinos. Many experiments are actively searching for such light sterile neutrinos through neutrino oscillation. For long baseline experiments, the matter effect should be treated carefully for precise calculation of the neutrino oscillation probabilities. However, this is usually time-consuming or analytically complex. In this manuscript, we adopt a Jacobi-like method to diagonalize the Hermitian Hamiltonian matrix and derive analytically simplified neutrino oscillation probabilities for 3 (active) + 1 (sterile)-neutrino mixing for a constant matter density. These approximations can reach a considerably high numerical accuracy while retaining their analytical simplicity and fast computing speed. This would be useful for current and future long baseline neutrino oscillation experiments.

Bao-Biao Yue

Wei Li

Jia-Jie Ling

Fan-Rong Xu

A compact analytical approximation for a light sterile neutrino oscillation in matter Jiajie Ling acknowledges the support from National Key R&D program of China (2018YFA0404103) and National Natural Science Foundation of China (11775315). F. Xu is supported partially by NSFC (11605076), as well as the FRFCU (Fundamental Research Funds for the Central Universities in China) (21616309)

Within an effective Lagrangian approach and resonance model, we study the and reactions via the -exchange mechanism. For the reaction, we perform a calculation of the differential and total cross-sections by considering the contributions of the intermediate resonance decaying into and then into . Besides, the non-resonance process is also considered. With a lower mass of , the experimental data for the invariant mass distributions can be fairly well reproduced. For the reaction, with the model parameters, the total cross-section is of the order of 10 μb at the photon beam energy ~2.5 GeV. It is expected that the model calculations in this work could be tested by future experiments.

Study of the a1 (1269) resonance in the γp →π+π+π-n reaction Supported by the National Natural Science Foundation of China (11475227, 11735003), and the Youth Innovation Promotion Association CAS (2016367)

We present a systematic short time expansion for the generating function of the one point height probability distribution for the KPZ equation with droplet initial condition, which goes much beyond previous studies. The expansion is checked against a numerical evaluation of the known exact Fredholm determinant expression. We also obtain the next order term for the Brownian initial condition. Although initially devised for short time, a resummation of the series allows to obtain also the long time large deviation function, found to agree with previous works using completely different techniques. Unexpected similarities with stationary large deviations of TASEP with periodic and open boundaries are discussed. Two additional applications are given. (i) Our method is generalized to study the linear statistics of the Airy point process, i.e. of the GUE edge eigenvalues. We obtain the generating function of the cumulants of the empirical measure to a high order. The second cumulant is found to match the result in the bulk obtained from the Gaussian free field by Borodin and Ferrari [1,2], but we obtain systematic corrections to the Gaussian free field (higher cumulants, expansion towards the edge). This also extends a result of Basor and Widom [3] to a much higher order. We obtain large deviation functions for the Airy point process for a variety of linear statistics test functions. (ii) We obtain results for the counting statistics of trapped fermions at the edge of the Fermi gas in both the high and the low temperature limits.

Alexandre Krajenbrink

Pierre Le Doussal

Sylvain Prolhac

Systematic time expansion for the Kardar–Parisi–Zhang equation, linear statistics of the GUE at the edge and trapped fermions

We improve the Monte-Carlo based QCD sum rules by introducing the rigorous Hölder-inequality-determined sum rule window and a Breit-Wigner type parametrization for the phenomenological spectral function. In this improved sum rule analysis methodology, the sum rule analysis window can be determined without any assumptions on OPE convergence or the QCD continuum. Therefore, an unbiased prediction can be obtained for the phenomenological parameters (the hadronic mass and width etc.). We test the new approach in the ρ meson channel with re-examination and inclusion of αs corrections to dimension-4 condensates in the OPE. We obtain results highly consistent with experimental values. We also discuss the possible extension of this method to some other channels.

Qi-Nan Wang

Canada

Zhu-Feng Zhang

T.G. Steele

Hong-Ying Jin

Zhuo-Ran Huang

A comprehensive revisit of the ρ meson with improved Monte-Carlo based QCD sum rulesSupported by NSFC (11175153, 11205093, 11347020), Open Foundation of the Most Important Subjects of Zhejiang Province, and K. C. Wong Magna Fund in Ningbo University, TGS is Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), Z. F. Zhang and Z. R. Huang are Grateful to the University of Saskatchewan for its Warm Hospitality

None Supervisory Editors of Nuclear Physics B

Editorial note on “Lepton-flavor violation and (g−2)μ in the μν SSM” by Hai-Bin Zhang, Tai-Fu Feng, Shu-Min Zhao and Tie-Jun Gao [Nucl. Phys. B 873 (2) (2013) 300–324]