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1. Measurement of electron neutrino and antineutrino cross sections at low momentum transfer

   https://doi.org/10.1103/PhysRevD.109.092008  

   Henry, S ; Su, H ; Akhter, S ; Ahmad_Dar, Z ; Ansari, V ; Ascencio, M V ; Sajjad_Athar, M ; Bashyal, A ; Betancourt, M ; Bonilla, J L ; et al ( May 2024 , Physical Review D)

   Accelerator based neutrino oscillation experiments seek to measure the relative number of electron and muon (anti)neutrinos at different$L/E$values. However high statistics studies of neutrino interactions are almost exclusively measured using muon (anti)neutrinos since the dominant flavor of neutrinos produced by accelerator based beams are of the muon type. This work reports new measurements of electron (anti)neutrinos interactions in hydrocarbon, obtained by strongly suppressing backgrounds initiated by muon flavor (anti)neutrinos. Double differential cross sections as a function of visible energy transfer,$E_{\text{avail}}$, and transverse momentum transfer,$p_T$, or three momentum transfer,$q_3$are presented.

   Published by the American Physical Society2024 

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2. Gluon moment and parton distribution function of the pion from Nf=2+1+1 lattice QCD

   https://doi.org/10.1103/PhysRevD.109.114509  

   Good, William ; Hasan, Kinza ; Chevis, Allison ; Lin, Huey-Wen ( June 2024 , Physical Review D)

   We present the first calculation of the pion gluon moment from lattice QCD in the continuum-physical limit. The calculation is done using clover fermions for the valence action with three pion masses, 220, 310 and 690 MeV, and three lattice spacings, 0.09, 0.12, and 0.15 fm, using ensembles generated by MILC Collaboration with$2+1+1$flavors of highly improved staggered quarks (HISQ). On the lattice, we nonperturbatively renormalize the gluon operator in RI/MOM scheme using the cluster-decomposition error reduction (CDER) technique to enhance the signal-to-noise ratio of the renormalization constant. We extrapolate the pion gluon moment to the continuum-physical limit and obtain$⟨x{⟩}_g=0.394(58{)}_{\mathrm{stat}+\mathrm{NPR}}(39{)}_{\text{mixing}}$in the$\overline{\mathrm{MS}}$scheme at 2 GeV, with first error being the statistical error and uncertainties in nonperturbative renormalization, and the second being a systematic uncertainty estimating the effect of ignoring quark mixing. Our pion gluon momentum fraction has a central value lower than two recent single-ensemble lattice-QCD results near physical pion mass but is consistent with the recent global fits by JAM and xFitter and with most QCD-model estimates.

   Published by the American Physical Society2024 

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3. Search for prompt production of pentaquarks in charm hadron final states

   https://doi.org/10.1103/PhysRevD.110.032001  

   Aaij, R ; Abdelmotteleb, A_S W ; Abellan_Beteta, C ; Abudinén, F ; Ackernley, T ; Adeva, B ; Adinolfi, M ; Adlarson, P ; Afsharnia, H ; Agapopoulou, C ; et al ( August 2024 , Physical Review D)

   A search for hidden-charm pentaquark states decaying to a range of${\mathrm{\Sigma }}_c\overline{D}$and${\mathrm{\Lambda }}_c^{+}\overline{D}$final states, as well as doubly charmed pentaquark states to${\mathrm{\Sigma }}_{c}D$and${\mathrm{\Lambda }}_c^{+}D$, is made using samples of proton-proton collision data corresponding to an integrated luminosity of$5.7{\mathrm{fb}}^{-1}$recorded by the LHCb detector at$\sqrt{s}=13\mathrm{TeV}$. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of the${\mathrm{\Lambda }}_c^{+}$baryon in the${\mathrm{\Lambda }}_c^{+}\to p{K}^{-}{\pi }^{+}$decay mode. The known pentaquark states are also investigated, and their signal yields are found to be consistent with zero in all cases.

   © 2024 CERN, for the LHCb Collaboration2024CERN 

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4. Optimizing fictitious states for Bell inequality violation in bipartite qubit systems with applications to the tt¯ system

   https://doi.org/10.1103/PhysRevD.109.116005  

   Cheng, Kun ; Han, Tao ; Low, Matthew ( June 2024 , Physical Review D)

   There is a significant interest in testing quantum entanglement and Bell inequality violation in high-energy experiments. Since the analyses in high-energy experiments are performed with events statistically averaged over phase space, the states used to determine observables depend on the choice of coordinates through an event-dependent basis and are thus not genuine quantum states, but rather “fictitious states.” We find that the basis which diagonalizes the spin-spin correlations is optimal for constructing fictitious states to test the violation of Bell’s inequality. This result is applied directly to the bipartite qubit system of a top and antitop produced at a hadron collider. We show that the beam axis is the optimal basis choice near the$t\overline{t}$threshold production for measuring Bell inequality violation, while at high transverse momentum the basis that aligns along the momentum direction of the top is optimal.