BibTex format
@article{Aad:2025:10.1016/j.physletb.2025.139671,
author = {Aad, G and Aakvaag, E and Abbott, B and Abdelhameed, S and Abeling, K and Abicht, NJ and Abidi, SH and Aboelela, M and Aboulhorma, A and Abramowicz, H and Abulaiti, Y and Acharya, BS and Ackermann, A and Adam, Bourdarios C and Adamczyk, L and Addepalli, SV and Addison, MJ and Adelman, J and Adiguzel, A and Adye, T and Affolder, AA and Afik, Y and Agaras, MN and Aggarwal, A and Agheorghiesei, C and Ahmadov, F and Ahuja, S and Ai, X and Aielli, G and Aikot, A and Ait, Tamlihat M and Aitbenchikh, B and Akbiyik, M and Åkesson, TPA and Akimov, AV and Akiyama, D and Akolkar, NN and Aktas, S and Al, Khoury K and Alberghi, GL and Albert, J and Albicocco, P and Albouy, GL and Alderweireldt, S and Alegria, ZL and Aleksa, M and Aleksandrov, IN and Alexa, C and Alexopoulos, T and Alfonsi, F and Algren, M and Alhroob, M and Ali, B and Ali, HMJ and Ali, S and Alibocus, SW and Aliev, M and Alimonti, G and Alkakhi, W and Allaire, C and Allbrooke, BMM and Allen, JS and Allen, JF and Allendes, Flores CA},
doi = {10.1016/j.physletb.2025.139671},
journal = {Physics Letters Section B Nuclear Elementary Particle and High Energy Physics},
title = {Search for Higgs boson decays into a Z boson and a light hadronically decaying resonance in pp collisions at s=13 TeV with the ATLAS detector},
url = {http://dx.doi.org/10.1016/j.physletb.2025.139671},
volume = {868},
year = {2025}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - A search for decays of the Higgs boson into a Z boson and a light resonance, with a mass of 0.5–3.5 GeV, is performed using the full 140 fb<sup>−1</sup> dataset of 13 TeV proton–proton collisions recorded by the ATLAS detector during LHC Run 2. Leptonic decays of the Z boson and hadronic decays of the light resonance are considered. The resonance can be interpreted as a J/ψ or η<inf>c</inf> meson, an axion-like particle, or a light pseudoscalar predicted in two-Higgs-doublet models. Due to its low mass, this resonance is produced with a high Lorentz boost in the laboratory frame and therefore reconstructed as a single small-radius jet of hadrons. A neural network is used to correct the Monte Carlo simulation of the total expected background using data from sideband regions. Two additional neural networks are used to distinguish signal from background, enhancing the purity of the signal region. A binned profile-likelihood fit is performed on the final-state invariant mass distribution. No significant excess of events relative to the expected background is observed, and upper limits at 95% confidence level are set on the Higgs boson's branching fraction to a Z boson and a light resonance. The exclusion limit is ∼10% for the lower masses, and increases for higher masses. Upper limits on the effective coupling C<inf>ZH</inf><sup>eff</sup>/Λ of an axion-like particle to a Higgs boson and Z boson are also set at 95% confidence level, and range from 0.9 to 2 TeV<sup>−1</sup>.
AU - Aad,G
AU - Aakvaag,E
AU - Abbott,B
AU - Abdelhameed,S
AU - Abeling,K
AU - Abicht,NJ
AU - Abidi,SH
AU - Aboelela,M
AU - Aboulhorma,A
AU - Abramowicz,H
AU - Abulaiti,Y
AU - Acharya,BS
AU - Ackermann,A
AU - Adam,Bourdarios C
AU - Adamczyk,L
AU - Addepalli,SV
AU - Addison,MJ
AU - Adelman,J
AU - Adiguzel,A
AU - Adye,T
AU - Affolder,AA
AU - Afik,Y
AU - Agaras,MN
AU - Aggarwal,A
AU - Agheorghiesei,C
AU - Ahmadov,F
AU - Ahuja,S
AU - Ai,X
AU - Aielli,G
AU - Aikot,A
AU - Ait,Tamlihat M
AU - Aitbenchikh,B
AU - Akbiyik,M
AU - Åkesson,TPA
AU - Akimov,AV
AU - Akiyama,D
AU - Akolkar,NN
AU - Aktas,S
AU - Al,Khoury K
AU - Alberghi,GL
AU - Albert,J
AU - Albicocco,P
AU - Albouy,GL
AU - Alderweireldt,S
AU - Alegria,ZL
AU - Aleksa,M
AU - Aleksandrov,IN
AU - Alexa,C
AU - Alexopoulos,T
AU - Alfonsi,F
AU - Algren,M
AU - Alhroob,M
AU - Ali,B
AU - Ali,HMJ
AU - Ali,S
AU - Alibocus,SW
AU - Aliev,M
AU - Alimonti,G
AU - Alkakhi,W
AU - Allaire,C
AU - Allbrooke,BMM
AU - Allen,JS
AU - Allen,JF
AU - Allendes,Flores CA
AU - Allport,PP
AU - Aloisio,A
AU - Alonso,F
AU - Alpigiani,C
AU - Alsolami,ZMK
AU - Alvarez,Estevez M
AU - Alvarez,Fernandez A
AU - Alves,Cardoso M
AU - Alviggi,MG
AU - Aly,M
AU - Amaral,Coutinho Y
AU - Ambler,A
AU - Amelung,C
AU - Amerl,M
AU - Ames,CG
AU - Amidei,D
AU - Amini,B
AU - Amirie,K
AU - Amor,Dos Santos SP
AU - Amos,KR
AU - Amperiadou,D
AU - An,S
AU - Ananiev,V
AU - Anastopoulos,C
AU - Andeen,T
AU - Anders,JK
AU - Anderson,AC
AU - Andreazza,A
AU - Angelidakis,S
AU - Angerami,A
AU - Anisenkov,AV
AU - Annovi,A
AU - Antel,C
AU - Antipov,E
AU - Antonelli,M
AU - Anulli,F
DO - 10.1016/j.physletb.2025.139671
PY - 2025///
SN - 0370-2693
TI - Search for Higgs boson decays into a Z boson and a light hadronically decaying resonance in pp collisions at s=13 TeV with the ATLAS detector
T2 - Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
UR - http://dx.doi.org/10.1016/j.physletb.2025.139671
VL - 868
ER -