Based on a sample of $2.7\times10^{9}$ $\psi(3686)$ events collected by the BESIII detector operating at the BEPCII collider, the decay $\psi(3686)\to\gamma\chi_{cJ}, \chi_{cJ}\to\eta\eta\eta^{\prime}$ is analyzed. The decay modes $\chi_{c1}$ and $\chi_{c2}\to\eta\eta\eta^{\prime}$ are observed for the first time, and their corresponding branching fractions are determined to be ${\cal{B}}(\chi_{c1}\to\eta\eta\eta^{\prime}) = $ $ (1.40\, \pm 0.13\, (\text{stat.}) \pm 0.09\, (\text{sys.})) \times 10^{-4}$ and ${\cal{B}}(\chi_{c2}\to\eta\eta\eta^{\prime}) = (4.18\, \pm 0.84\, (\text{stat.}) \pm 0.48\, (\text{sys.})) \times 10^{-5}$ . An upper limit on the branching fraction of $\chi_{c0}\to\eta\eta\eta^{\prime}$ is set as $2.59 \times 10^{-5}$ at a 90% confidence level (CL). A partial wave analysis (PWA) of the decay $\chi_{c1}\to\eta\eta\eta^{\prime}$ is performed to search for the $1^{-+}$ exotic state $\eta_1(1855)$ . The PWA result indicates that the structure in the $\eta\eta^{\prime}$ mass spectrum is attributed to $f_0(1500)$ , while in the $\eta\eta$ mass spectrum, it is attributed to the $0^{++}$ phase space. The upper limit of ${\cal{B}}(\chi_{c1}\to\eta_{1}(1855)\eta) \cdot {\cal{B}}(\eta_{1}(1855)\to\eta\eta^{\prime}) \lt $ $ 9.79 \times 10^{-5}$ is set based on the PWA at 90% CL.

China

M. Ablikim

Russia

M.N. Achasov

Sweden

P. Adlarson

X.C. Ai

Germany

R. Aliberti

Italy

A. Amoroso

Q. An

Y. Bai

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

United States

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

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

X.Y. Chen

Y.B. Chen

Y.Q. Chen

Z. Chen

Z.J. Chen

Z.K. Chen

S.K. Choi

X. Chu

G. Cibinetto

F. Cossio

United Kingdom

J. Cottee-Meldrum

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

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

L. Feng

Q.X. Feng

Search for $\textit{η}$ $_{1}$(1855) in $\textit{χ}$ $\textit{cJ}$ → $\textit{ηηη}$′ decays * Supported in part by National Key R&D Program of China (2023YFA1606000, 2023YFA1606704); National Natural Science Foundation of China (NSFC) (11635010, 11935015, 11935016, 11935018, 12025502, 12035009, 12035013, 12061131003, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265, 12221005, 12225509, 12235017, 12361141819); the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS (YSBR-101); 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; Agencia Nacional de Investigación y Desarrollo de Chile (ANID), Chile (ANID PIA/APOYO AFB230003); German Research Foundation DFG (FOR5327); Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation (2021.0174, 2021.0299); Ministry of Development of Turkey (DPT2006K-120470); National Research Foundation of Korea ( NRF-2022R1A2C1092335); National Science and Technology fund of Mongolia; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources Institutional Development, Research and Innovation of Thailand ( B50G670107); Polish National Science Centre (2024/53/B/ST2/00975); Swedish Research Council (2019.04595); U. S. Department of Energy (DE-FG02-05ER41374)

<p>We consider a neutrinophilic <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>U</mi><mo stretchy="false">(</mo><mn>1</mn><mo stretchy="false">)</mo></math> extension of the Standard Model (SM) under which only a second Higgs doublet and SM singlet scalars and fermions are charged. The new gauge boson <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>Z</mi><mo>′</mo></msup></math> couples to the SM minimally, generated by <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>Z</mi><mo>−</mo><msup><mi>Z</mi><mo>′</mo></msup></math> mixing. As the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>Z</mi><mo>′</mo></msup></math> is very weakly coupled, it can mostly be produced through the decay of the scalars from the second Higgs doublet at the Large Hadron Collider (LHC). We discuss the scalar sector of the model in detail and consider decay modes such as <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><msup><mi>H</mi><mo>±</mo></msup><mo stretchy="false">→</mo><msup><mi>W</mi><mo>±</mo></msup><msup><mi>Z</mi><mo>′</mo></msup><mo>,</mo><msub><mi>h</mi><mn>2</mn></msub><mo stretchy="false">→</mo><mi>V</mi><mi>V</mi><mo>,</mo><mo stretchy="false">(</mo><mi>V</mi><mo>=</mo><msup><mi>W</mi><mo>±</mo></msup><mo>,</mo><mi>Z</mi><mo>,</mo><msup><mi>Z</mi><mo>′</mo></msup><mo stretchy="false">)</mo><mo>,</mo><msub><mi>A</mi><mn>2</mn></msub><mo stretchy="false">→</mo><msub><mi>h</mi><mn>1</mn></msub><msup><mi>Z</mi><mo>′</mo></msup><mo stretchy="false">(</mo><mi>Z</mi><mo stretchy="false">)</mo><mo stretchy="false">)</mo></math> that lead to multilepton signals at the LHC from the pair production of the scalars. We analyze the signal with a representative value of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>Z</mi><mo>′</mo></msup></math> mass to show the discovery potential of the two-Higgs doublet model scalars at the LHC.</p>

India

Anjan Kumar Barik

Santosh Kumar Rai

Agnivo Sarkar

LHC signals for a 2HDM with <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>Z</mi><mo>′</mo></msup></math> in a neutrinophilic <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>U</mi><mo stretchy="false">(</mo><mn>1</mn><mo stretchy="false">)</mo></math> model

At finite lattice spacing, Lagrangian and Hamiltonian predictions differ due to discretization effects. In the Hamiltonian limit, i.e. at vanishing temporal lattice spacing $$a_t$$ , the path integral approach in the Lagrangian formalism reproduces the results of the Hamiltonian theory. In this work, we numerically calculate the Hamiltonian limit of a $\textit{U}$(1) gauge theory in $$(2+1)$$ dimensions. This is achieved by Monte Carlo simulations in the Lagrangian formalism with lattices that are anisotropic in the time direction. For each ensemble, we determine the ratio between the temporal and spatial scale with the static quark potential and extrapolate to $$a_t \rightarrow 0$$ . Our results are compared with the data from Hamiltonian simulations at small volumes, showing agreement within $$<2\sigma $$ . These results can be used to match the two formalisms.

C. Groß

Switzerland

S. Romiti

L. Funcke

Cyprus

K. Jansen

Canada

A. Kan

S. Kühn

C. Urbach

Matching Lagrangian and Hamiltonian simulations in (2+1)-dimensional U(1) gauge theory

<p>A multicomponent weakly-interacting dark matter scenario is analyzed, where the candidate dark matter states arise from the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>2</mn><msub><mo stretchy="false">)</mo><mi>D</mi></msub><mo stretchy="false">→</mo><msubsup><mi>Z</mi><mn>3</mn><mi>D</mi></msubsup><mo>×</mo><msubsup><mi>Z</mi><mn>2</mn><mi>acc</mi></msubsup></math> symmetry breaking triggered by a vacuum expectation value-developing scalar in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>J</mi><mo>=</mo><mn>3</mn><mo>/</mo><mn>2</mn></math> representation. While the discrete symmetries guarantee at least two stable states, a closer look at the mass orderings of the contrived dark sector reveals the existence of a third dark matter candidate, whose stability effectively results from the tight phase space in the dark boson sector. Regions of masses and couplings where the three dark states furnish a comparable contribution to the observed relic abundance are determined numerically.</p>

Carlos Alvarado

Mexico

Alfredo Aranda

Chile

Cesar Bonilla

Carlos Ramos Portalatino

Multicomponent dark matter from an <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>S</mi><mi>U</mi><mo stretchy="false">(</mo><mn>2</mn><msub><mo stretchy="false">)</mo><mi>D</mi></msub><mo stretchy="false">→</mo><msubsup><mi>Z</mi><mn>3</mn><mi>D</mi></msubsup><mo>×</mo><msubsup><mi>Z</mi><mn>2</mn><mrow><mi>acc</mi></mrow></msubsup></math> scenario

Radioactive tin beams were used to explore the flow observables under varying isospin asymmetries while maintaining a constant total charge. The rapidity dependence of directed flow ( <math altimg='si16.svg'><msub><mi>v</mi><mn>1</mn></msub></math>) and elliptic flow ( <math altimg='si23.svg'><msub><mi>v</mi><mn>2</mn></msub></math>) was studied for protons, deuterons, tritons, <math altimg='si7.svg'><mrow><msup><mrow /><mn>3</mn></msup><mrow><mi mathvariant='normal'>H</mi></mrow><mi>e</mi></mrow></math>, and <math altimg='si24.svg'><mrow><msup><mrow /><mn>4</mn></msup><mrow><mi mathvariant='normal'>H</mi></mrow><mi>e</mi></mrow></math>, produced in neutron-rich <math altimg='si25.svg'><mrow><msup><mrow /><mn>132</mn></msup><mrow><mi mathvariant='normal'>Sn</mi></mrow><mo linebreak='goodbreak'>+</mo><msup><mrow /><mn>124</mn></msup><mrow><mi mathvariant='normal'>Sn</mi></mrow></mrow></math> and neutron-deficient <math altimg='si18.svg'><mrow><msup><mrow /><mn>108</mn></msup><mrow><mrow><mi mathvariant='normal'>S</mi></mrow><mi>n</mi></mrow><mo linebreak='goodbreak'>+</mo><msup><mrow /><mn>112</mn></msup><mrow><mrow><mi mathvariant='normal'>S</mi></mrow><mi>n</mi></mrow></mrow></math> collisions at 270 <math altimg='si26.svg'><mrow><mi mathvariant='normal'>MeV</mi><mo linebreak='goodbreak'>/</mo><mtext>nucleon</mtext></mrow></math>. In general, heavier particles exhibited larger <math altimg='si16.svg'><msub><mi>v</mi><mn>1</mn></msub></math> and <math altimg='si23.svg'><msub><mi>v</mi><mn>2</mn></msub></math> values. The experimental data was used to test transport models which simulate heavy ion collisions. Specifically, comparisons were made with Antisymmetrized Molecular Dynamics (AMD) model calculations, which explicitly account for cluster correlations. Two types of momentum-dependent mean field potentials were tested. The results reveal that both <math altimg='si16.svg'><msub><mi>v</mi><mn>1</mn></msub></math> and <math altimg='si23.svg'><msub><mi>v</mi><mn>2</mn></msub></math> values are enhanced when the mean field incorporates stronger momentum dependence. In addition, <math altimg='si23.svg'><msub><mi>v</mi><mn>2</mn></msub></math> exhibits larger sensitivity to symmetry energy than <math altimg='si16.svg'><msub><mi>v</mi><mn>1</mn></msub></math> but the overall sensitivity to symmetry energy is low. In an attempt to describe the data, different parameter sets have been tried. Most describe either the hydrogen flow or helium flow reasonably well but none describes the flow of all particles simultaneously.

Japan

M. Kurata-Nishimura

M. Kaneko

T. Isobe

T. Murakami

A. Ono

N. Ikeno

C.Y. Tsang

J. Barney

J. Estee

G. Jhang

South Korea

J.W. Lee

W.G. Lynch

M.B. Tsang

R. Shane

C. Santamaria

Thailand

S. Tangwancharoen

R. Wang

A.B. McIntosh

S.J. Yennello

G. Cerizza

J. Manfredi

P. Morfouace

P. Lasko

J. Łukasik

A. Sochocka

Y.J. Kim

P. Pawłowski

K. Pelczar

J. Brzychczyk

Y. Zhang

B. Hong

Z.G. Xiao

L. Atar

T. Aumann

K. Boretzky

Croatia

I. Gasparic

A. Horvat

Y. Leifels

D. Rossi

H. Scheit

H. Simon

Netherlands

A. Snoch

H. Törnqvist

D.S. Ahn

H. Baba

N. Chiga

N. Fukuda

K. Ieki

N. Inabe

T. Kobayashi

Y. Kondo

H.S. Lee

T. Nakamura

N. Nakatsuka

S. Nishimura

H. Otsu

H. Sakurai

H. Sato

Y. Shimizu

T. Sumikama

D. Suzuki

Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u