By analyzing a data sample of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> collisions with center-of-mass energy <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>3.773</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi></mrow></math>, corresponding to an integrated luminosity of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>7.9</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> collected with the BESIII detector operating at the BEPCII collider, we study semileptonic decays of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mrow><mn>0</mn><mo stretchy="false">(</mo><mo>+</mo><mo stretchy="false">)</mo></mrow></msup></math> mesons into the axial-vector meson <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>b</mi><mn>1</mn></msub><mo stretchy="false">(</mo><mn>1235</mn><mo stretchy="false">)</mo></math> via the decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><mo stretchy="false">)</mo><mo stretchy="false">→</mo><mi>ω</mi><mi>π</mi></mrow></math>. The decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub></mrow></math> is observed with a significance of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>5.2</mn><mi>σ</mi></mrow></math> after considering systematic uncertainty, while evidence for the decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub></mrow></math> is obtained with a <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>3.1</mn><mi>σ</mi></mrow></math> significance. The product branching fractions are determined to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="script">B</mi><mo stretchy="false">[</mo><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub><mo stretchy="false">]</mo><mo>×</mo><mi mathvariant="script">B</mi><mo stretchy="false">[</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mo>−</mo></mrow></msup><mo stretchy="false">→</mo><mi>ω</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo stretchy="false">]</mo><mo>=</mo><mo stretchy="false">(</mo><mn>0.72</mn><mo>±</mo><mn>0.1</mn><msubsup><mrow><mn>8</mn></mrow><mrow><mo>−</mo><mn>0.08</mn></mrow><mrow><mo>+</mo><mn>0.06</mn></mrow></msubsup><mo stretchy="false">)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="script">B</mi><mo stretchy="false">[</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub><mo stretchy="false">]</mo><mo>×</mo><mi mathvariant="script">B</mi><mo stretchy="false">[</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><mi>ω</mi><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">]</mo><mo>=</mo><mspace linebreak="goodbreak"></mspace><mo stretchy="false">(</mo><mn>1.16</mn><mo>±</mo><mn>0.44</mn><mo>±</mo><mn>0.16</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></mrow></math>, where the first uncertainties are statistical and the second systematic. The ratio of their partial decay widths is determined to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mo stretchy="false">{</mo><mi mathvariant="normal">Γ</mi><mo stretchy="false">[</mo><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mo stretchy="false">−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo stretchy="false">+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub><mo stretchy="false">]</mo><mo>/</mo><mn>2</mn><mi mathvariant="normal">Γ</mi><mo stretchy="false">[</mo><msup><mrow><mi>D</mi></mrow><mrow><mo stretchy="false">+</mo></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo stretchy="false">+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub><mo stretchy="false">]</mo><mo stretchy="false">}</mo><mo>=</mo><mspace linebreak="goodbreak"></mspace><mn>0.78</mn><mo>±</mo><mn>0.1</mn><msubsup><mrow><mn>9</mn></mrow><mrow><mo>−</mo><mn>0.05</mn></mrow><mrow><mo>+</mo><mn>0.04</mn></mrow></msubsup></mrow></math>, which is consistent with unity, predicted by isospin invariance, within uncertainties.

China

M. Ablikim

Russia

M.N. Achasov

Sweden

P. Adlarson

Germany

O. Afedulidis

X.C. Ai

R. Aliberti

Italy

A. Amoroso

Q. An

Y. Bai

JINR

O. Bakina

I. Balossino

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

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.Y. Chen

South Korea

S.K. Choi

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

J. Dong

L.Y. Dong

M.Y. Dong

X. Dong

M.C. Du

S.X. Du

Y.Y. Duan

Z.H. Duan

P. Egorov

Y.H. Fan

J. Fang

S.S. Fang

W.X. Fang

Y. 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

Y.W. Fu

H. Gao

Observation of the Singly Cabibbo Suppressed Decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>D</mi><mn>0</mn></msup><mo stretchy="false">→</mo><msub><mi>b</mi><mn>1</mn></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mo stretchy="false">)</mo><mo>−</mo></msup><msup><mi>e</mi><mo>+</mo></msup><msub><mi>ν</mi><mi>e</mi></msub></math> and Evidence for <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>b</mi></mrow><mrow><mn>1</mn></mrow></msub><mo stretchy="false">(</mo><mn>1235</mn><msup><mrow><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub></mrow></math>

Utilizing <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>2712.4</mn><mo>±</mo><mn>14.3</mn><mtext> </mtext><mtext> </mtext><mi>million</mi></math> <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> events accumulated by the BESIII experiment, we perform a partial wave analysis of <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><mo stretchy="false">→</mo><mi>γ</mi><msub><mi>χ</mi><mrow><mi>c</mi><mi>J</mi></mrow></msub><mo stretchy="false">→</mo><mi>γ</mi><mi mathvariant="normal">Λ</mi><mover accent="true"><mi mathvariant="normal">Λ</mi><mo stretchy="false">¯</mo></mover></math> decay (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>J</mi><mo>=</mo><mn>0</mn></math>, 1, 2). The ratio of the helicity amplitudes with same (++) and opposite (+-) helicity for <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub><mo stretchy="false">→</mo><mi mathvariant="normal">Λ</mi><mover accent="true"><mi mathvariant="normal">Λ</mi><mo stretchy="false">¯</mo></mover></math> decay is determined for the first time to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>R</mi><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></msub><mo>=</mo><mn>0.575</mn><mo>±</mo><mn>0.048</mn><mo>±</mo><mn>0.018</mn></math>, with a relative phase angle <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Δ</mi><msub><mi mathvariant="normal">Φ</mi><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></msub><mo>=</mo><mn>0.37</mn><mo>±</mo><mn>0.15</mn><mo>±</mo><mn>0.05</mn><mtext> </mtext><mtext> </mtext><mi>rad</mi></math>. The parameters of the angular distribution of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></math> are determined to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>α</mi><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></msub><mo>=</mo><mo>−</mo><mn>0.211</mn><mo>±</mo><mn>0.100</mn><mo>±</mo><mn>0.050</mn></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>β</mi><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></msub><mo>=</mo><mo>−</mo><mn>0.039</mn><mo>±</mo><mn>0.089</mn><mo>±</mo><mn>0.033</mn></math>, based on the distribution <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>d</mi><mi>N</mi><mo>/</mo><mi>d</mi><mi>cos</mi><mi>θ</mi><mo>=</mo><mn>1</mn><mo>+</mo><msub><mi>α</mi><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></msub><msup><mi>cos</mi><mn>2</mn></msup><mi>θ</mi><mo>+</mo><msub><mi>β</mi><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></msub><msup><mi>cos</mi><mn>4</mn></msup><mi>θ</mi></math>. The width of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mn>0</mn></mrow></msub></math> is determined to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>12.31</mn><mo>±</mo><mn>0.26</mn><mo>±</mo><mn>0.12</mn><mtext> </mtext><mtext> </mtext><mi>MeV</mi></math>. Additionally, the branching fractions for <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mi>J</mi></mrow></msub><mo stretchy="false">→</mo><mi mathvariant="normal">Λ</mi><mover accent="true"><mi mathvariant="normal">Λ</mi><mo stretchy="false">¯</mo></mover></math> are measured to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><mn>3.662</mn><mo>±</mo><mn>0.048</mn><mo>±</mo><mn>0.111</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><mn>1.182</mn><mo>±</mo><mn>0.026</mn><mo>±</mo><mn>0.042</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><mn>1.704</mn><mo>±</mo><mn>0.035</mn><mo>±</mo><mn>0.057</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></math> for <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mn>0</mn></mrow></msub></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mn>1</mn></mrow></msub></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mn>2</mn></mrow></msub></math>, respectively, where the first uncertainty is statistical and the second systematic.

M.H. Cai

X.Y. Chen

Z. Chen

Z.K. Chen

X. Chu

United Kingdom

J. Cottee-Meldrum

Y.X. Ding

G.F. Fan

J.J. Fan

L. Feng

Q.X. Feng

Helicity amplitude and branching fraction measurement of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>χ</mi><mrow><mi>c</mi><mi>J</mi></mrow></msub><mo stretchy="false">→</mo><mi mathvariant="normal">Λ</mi><mover accent="true"><mi mathvariant="normal">Λ</mi><mo stretchy="false">¯</mo></mover></math>

A generalization of the phenomenological blast-wave-Tsallis-power model, recently proposed by the author for the hadrons' transverse momentum (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math>) spectra measured at the CERN Large Hadron Collider (LHC), is developed to also describe the hadrons' <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math>-differential elliptic flow coefficients <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math> in identical nuclei collisions of different centralities. The model describes well the available data on <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math> spectra and <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math> for any <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mtext>T</mtext></msub></math> of various particles, from pions to charmonia, in Pb-Pb collisions at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo></mrow></math> 2.76 and 5.02 TeV and in Xe-Xe collisions at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo></mrow></math> 5.44 TeV. Also, predictions for OO collisions at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo></mrow></math> 5.36 TeV are given. While the model is mainly targeting the energies available at the LHC, it also works at much lower energies available at the BNL Relativistic Heavy Ion Collider.

Smbat Grigoryan

Blast-wave-Tsallis-power model for <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>p</mi><mi>T</mi></msub></math> spectra and elliptic flow <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>v</mi><mn>2</mn></msub></math> of hadrons in collisions of identical nuclei at energies available at the CERN Large Hadron Collider

In this work, we study the potential of analyzing the particular combination of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>κ</mi></math> modifiers given by <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>κ</mi><mi>V</mi><mn>2</mn></msubsup><mo>−</mo><msub><mi>κ</mi><mrow><mn>2</mn><mi>V</mi></mrow></msub></math> to disentangle beyond Standard Model Higgs signals in double Higgs production with two extra light jets at LHC. We use the Higgs effective field theory approach, HEFT, for the gauge invariant description of these two <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>κ</mi><mi>V</mi></msub></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>κ</mi><mrow><mn>2</mn><mi>V</mi></mrow></msub></math> parameters representing the BSM interactions of the Higgs particle with the electroweak gauge bosons, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>H</mi><mi>V</mi><mi>V</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>H</mi><mi>H</mi><mi>V</mi><mi>V</mi></math>, respectively. We illustrate the bonus of studying this particular combination <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>κ</mi><mi>V</mi><mn>2</mn></msubsup><mo>−</mo><msub><mi>κ</mi><mrow><mn>2</mn><mi>V</mi></mrow></msub></math> focusing in just one process, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>H</mi><mi>H</mi><mi>j</mi><mi>j</mi></math>, instead of studying <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>κ</mi><mi>V</mi></msub></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>κ</mi><mrow><mn>2</mn><mi>V</mi></mrow></msub></math> separately using various processes. For the detailed analysis here, we focus on the particular final state <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>H</mi><mo stretchy="false">(</mo><mo stretchy="false">→</mo><mi>γ</mi><mi>γ</mi><mo stretchy="false">)</mo><mi>H</mi><mo stretchy="false">(</mo><mo stretchy="false">→</mo><mi>b</mi><mover accent="true"><mi>b</mi><mo stretchy="false">¯</mo></mover><mo stretchy="false">)</mo><mi>j</mi><msup><mi>j</mi><mo>′</mo></msup></math>, with two photons, two b-jets and two light jets, which we analyze fully including parton showering, fragmentation, hadronization and detector effects, in both signal and main background. We find that the sensitivity to <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>κ</mi><mi>V</mi><mn>2</mn></msubsup><mo>−</mo><msub><mi>κ</mi><mrow><mn>2</mn><mi>V</mi></mrow></msub></math> could be notably improved at the HL-LHC by the proper cuts on the final state <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>b</mi><mover accent="true"><mi>b</mi><mo stretchy="false">¯</mo></mover><mi>γ</mi><mi>γ</mi><mi>j</mi><msup><mi>j</mi><mo>′</mo></msup></math> that select optimally the events with VBF-topology and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>H</mi><mi>H</mi></math>-topology. In particular, we propose strategies based on a good isolation of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>γ</mi><mi>γ</mi></math> and b-jet pairs, and focus specially on specific variables like <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>η</mi><mrow><mi>γ</mi><mi>γ</mi></mrow></msub></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>P</mi><mrow><mi>γ</mi><mi>γ</mi></mrow><mi>T</mi></msubsup></math> where the signal events distributions may efficiently discriminate between BSM signal versus SM background. We will show here how the high transversality of these two pairs in the signal (inherited from the high transversality of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>H</mi></math>’s) is correlated with the nonvanishing value of this <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><msubsup><mi>κ</mi><mi>V</mi><mn>2</mn></msubsup><mo>−</mo><msub><mi>κ</mi><mrow><mn>2</mn><mi>V</mi></mrow></msub><mo stretchy="false">)</mo></math> combination.

Spain

D. Domenech

G. García-Mir

M. Herrero

Tests of BSM Higgs interactions by the combination <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo stretchy="false">(</mo><msubsup><mi>κ</mi><mi>V</mi><mn>2</mn></msubsup><mo>−</mo><msub><mi>κ</mi><mrow><mn>2</mn><mi>V</mi></mrow></msub><mo stretchy="false">)</mo></math> in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>H</mi><mi>H</mi><mi>j</mi><mi>j</mi></math> production at LHC

Based on $ (10087\pm 44)\times10^{6} $ $ J/\psi $ events collected with the BESIII detector, we search for the lepton number violating decay $ J/\psi \to K^+K^+e^-e^- + c.c. $ for the first time. The upper limit on the branching fraction of this decay is set to $ 2.1 \times 10^{-9} $ at the 90% confidence level with a frequentist method. This is the first search for $ J/\psi $ decays with a lepton number change by two, offering valuable insights into the underlying physical processes.

M.B. Bertani

T.T. Chang

J.C. Cheng

L.N. Cheng

I. Denisenko

X.L. Du

Search for the lepton number violating process ${{\boldsymbol J}/{\boldsymbol\psi }{\bf\to}{\boldsymbol K}^{\bf +}{\boldsymbol K}^{\bf +}{\boldsymbol e}^{\bf -}{\boldsymbol e}^{\bf -}{\bf +}{\boldsymbol {c.c.}}}$ * This work is supported in part by National Key R&D Program of China under Contracts Nos. 2023YFA1606000, 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts Nos. 12035009, 11635010, 11935015, 11935016, 11935018, 12025502, 12035013, 12061131003, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265, 12221005, 12225509, 12235017, 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts Nos. 2021.0174, 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. 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 under Contract No. B50G670107; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; Swedish Research Council under Contract No. 2019.04595; U. S. Department of Energy under Contract No. DE-FG02-05ER41374

We propose a novel method to detect reactor $ \overline{\nu}^{}_e \to \overline{\nu}^{}_\mu $ and $ \overline{\nu}^{}_e \to \overline{\nu}^{}_\tau $ oscillations by using elastic antineutrino-electron scattering processes $ \overline{\nu}^{}_\alpha + e^- \to \overline{\nu}^{}_\alpha + e^- $ (for $ \alpha = e, \mu, \tau $ ), among which the $ \overline{\nu}^{}_e $ events can be singled out by accurately measuring the $ \overline{\nu}^{}_e $ flux via the inverse beta decay $ \overline{\nu}^{}_e + p \to e^+ + n $ . A proof-of-concept study shows that such measurements will not only be able to test the conservation of probability for reactor antineutrino oscillations, but also offer a new possibility to probe leptonic CP violation at the one-loop level.

Yifang Wang

Zhi-zhong Xing

Shun Zhou

Towards a detection of reactor ${\overline {\boldsymbol v}_{\boldsymbol e} \boldsymbol\to \overline {\boldsymbol v}_{\boldsymbol\mu} }$ and ${\overline {\boldsymbol v}_{\boldsymbol e} \boldsymbol\to \overline {\boldsymbol v}_{\boldsymbol\tau} }$ oscillations with possible CP violation * Supported in part by the National Natural Science Foundation of China (12475113, 12535007), the CAS Project for Young Scientists in Basic Research (YSBR-099), and the Scientific and Technological Innovation Program of IHEP (E55457U2)

In this work, we discuss both relativistic and perturbative QCD corrections to the transition form-factor $$\mathcal{F}_{\eta _Q}{(t_1,t_2)}$$ for the process $$\gamma ^*(q_1) \gamma ^*(q_2) \leftrightarrow \eta _Q(P)$$ with dependencies on the normalised photon virtualities $$t_1=q_1^2/m_Q^2$$ and $$t_2=q_2^2/m_Q^2$$ , where $$m_Q$$ is the heavy quark mass. We resum a class of relativistic corrections to all orders in the relativistic parameter $$\langle v^2 \rangle _{\eta _Q}$$ . In addition, we include perturbative QCD corrections up to next-to-next-to-leading order (NNLO) in the strong coupling constant $$\alpha _s$$ . This involves the computation of two-loop amplitudes with two off-shell photons. We explore three different phenomenological applications of our transition form-factors for the charmonium case. We first study the ratio $$\vert \mathcal{F}_{\eta _c}{(t_1,0)} \vert / \vert \mathcal{F}_{\eta _c}{(0,0)} \vert $$ for the single space-like photon case and compare our results with the existing $$\eta _c$$ measurements from the collaboration. Secondly, we consider observables for the case of double space-like photons and discuss the impact of the different corrections. The NNLO corrections for this case are presented here for the first time in the literature. Finally, we revisit the decay width $$\Gamma [\eta _c \rightarrow \gamma \gamma ]$$ and compare it with the existing PDG value.

Izabela Babiarz

France

Chris Flett

Melih Ozcelik

Wolfgang Schäfer

Antoni Szczurek

Transition form-factor for $$\eta _Q$$ at NNLO in the strong coupling $$\alpha _s$$ and with all-order $$v^2$$ resummation

We search for a possible <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi mathvariant="normal">Λ</mi><mi>c</mi></msub><msub><mover accent="true"><mi mathvariant="normal">Σ</mi><mo stretchy="false">¯</mo></mover><mi>c</mi></msub></math> bound state, denoted as <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msubsup><mi>H</mi><mi>c</mi><mo>±</mo></msubsup></math>, via the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>−</mo></msup><mo stretchy="false">→</mo><msup><mi>π</mi><mo>+</mo></msup><msup><mi>π</mi><mo>−</mo></msup><msubsup><mi mathvariant="normal">Λ</mi><mi>c</mi><mo>+</mo></msubsup><msubsup><mover accent="true"><mi mathvariant="normal">Λ</mi><mo stretchy="false">¯</mo></mover><mi>c</mi><mo>−</mo></msubsup></math> process for the first time. This analysis utilizes 207.8 and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>159.3</mn><mtext> </mtext><mtext> </mtext><msup><mi>pb</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>−</mo></msup></math> annihilation data at the center-of-mass energies of 4918.02 and 4950.93 MeV, respectively, collected with the BESIII detector at the BEPCII collider. No statistically significant signal is observed. The upper limits of the product of Born cross section and branching fraction <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>σ</mi><mo stretchy="false">(</mo><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>−</mo></msup><mo stretchy="false">→</mo><msup><mi>π</mi><mo>+</mo></msup><msubsup><mi>H</mi><mi>c</mi><mo>−</mo></msubsup><mo>+</mo><mi mathvariant="normal">c</mi><mo>.</mo><mi mathvariant="normal">c</mi><mo>.</mo><mo stretchy="false">)</mo><mo>×</mo><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><msubsup><mi>H</mi><mi>c</mi><mo>−</mo></msubsup><mo stretchy="false">→</mo><msup><mi>π</mi><mo>−</mo></msup><msubsup><mi mathvariant="normal">Λ</mi><mi>c</mi><mo>+</mo></msubsup><msubsup><mover accent="true"><mi mathvariant="normal">Λ</mi><mo stretchy="false">¯</mo></mover><mi>c</mi><mo>−</mo></msubsup><mo stretchy="false">)</mo></math> at a 90% confidence level are reported at each energy point and for various <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>H</mi><mi>c</mi></msub></math> mass hypotheses (4715, 4720, 4725, 4730, and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>4735</mn><mtext> </mtext><mtext> </mtext><mi>MeV</mi><mo>/</mo><msup><mi>c</mi><mn>2</mn></msup></math>) and widths (5, 10, or 20 MeV), with the upper limits ranging from 1.1 pb to 6.4 pb.

Search for a bound state of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi mathvariant="normal">Λ</mi><mi>c</mi></msub><msub><mover accent="true"><mi mathvariant="normal">Σ</mi><mo stretchy="false">¯</mo></mover><mi>c</mi></msub></math> near threshold

Based on a sample of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mo stretchy="false">(</mo><mn>10.087</mn><mo>±</mo><mn>0.044</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>9</mn></mrow></msup><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math> events collected by the BESIII detector at the BEPCII collider, we perform the first search for the lepton number violating decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>η</mi><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>+</mo><mi mathvariant="normal">c</mi><mo>.</mo><mi mathvariant="normal">c</mi></mrow></math>. No signal is found, and an upper limit on the branching fraction of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>η</mi><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>+</mo><mi mathvariant="normal">c</mi><mo>.</mo><mi mathvariant="normal">c</mi><mo>.</mo></mrow></math> is set to be <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>4.6</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>6</mn></mrow></msup></math> at the 90% confidence level.

Search for the lepton number violating decay <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>η</mi><mo stretchy="false">→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>+</mo><mi mathvariant="normal">c</mi><mo>.</mo><mi mathvariant="normal">c</mi><mo>.</mo></mrow></math> via <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>J</mi><mo>/</mo><mi>ψ</mi><mo stretchy="false">→</mo><mi>ϕ</mi><mi>η</mi></math>

We investigate the nonleptonic two-body weak decays of the single bottom baryon <math altimg='si83.svg'><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>b</mi></mrow><mo>*</mo></msubsup></math> into <math altimg='si93.svg'><mrow><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>c</mi></mrow><mo>*</mo></msubsup><mi>P</mi><mrow><mo>(</mo><mi>V</mi><mo>)</mo></mrow></mrow></math> final states within the factorization framework. Employing this framework and incorporating the contributions from the current-current operators, we compute the tree-level decay amplitudes and decay widths of the <math altimg='si92.svg'><mrow><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>b</mi></mrow><mo>*</mo></msubsup><mo>&#8594;</mo><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>c</mi></mrow><mo>*</mo></msubsup><mi>P</mi><mrow><mo>(</mo><mi>V</mi><mo>)</mo></mrow></mrow></math> processes in terms of the <math altimg='si94.svg'><mrow><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>b</mi></mrow><mo>*</mo></msubsup><mo>&#8594;</mo><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>c</mi></mrow><mo>*</mo></msubsup></mrow></math> transition form factors. Here, <italic>P</italic> and <italic>V</italic> denote pseudoscalar and vector mesons, respectively. Using the form factors obtained in our previous work, we evaluate the numerical values of the decay widths for the dominant nonleptonic weak channels. This study complements our previous analysis of the semileptonic weak transitions <math altimg='si95.svg'><mrow><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>b</mi></mrow><mo>*</mo></msubsup><mo>&#8594;</mo><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>c</mi></mrow><mo>*</mo></msubsup><mi>&#8467;</mi><msub><mover accent='true'><mi>&#957;</mi><mo>&#175;</mo></mover><mi>&#8467;</mi></msub></mrow></math> reported in Ref. [1], thereby providing a detailed investigation of dominant <math altimg='si94.svg'><mrow><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>b</mi></mrow><mo>*</mo></msubsup><mo>&#8594;</mo><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>c</mi></mrow><mo>*</mo></msubsup></mrow></math> weak decays of the <math altimg='si83.svg'><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>b</mi></mrow><mo>*</mo></msubsup></math> baryon.

Iran

A. Amiri

K. Azizi

Nonleptonic <math altimg='si92.svg'><mrow><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>b</mi></mrow><mo>*</mo></msubsup><mo>&#8594;</mo><msubsup><mstyle mathvariant='normal'><mi>&#937;</mi></mstyle><mrow><mi>c</mi></mrow><mo>*</mo></msubsup><mi>P</mi><mrow><mo>(</mo><mi>V</mi><mo>)</mo></mrow></mrow></math> weak transitions in QCD