Nuclear Theory·nucl-th

Thursday·July 29, 2021

12 papers—6 primary·6 cross-listed

07
Measurement of Bell-type inequalities and quantum entanglement from $Λ$ -hyperon spin correlations at high energy colliders
Wenjie Gong🇺🇸 · Ganesh Parida🇺🇸 · Zhoudunming Tu🇺🇸 · Raju Venugopalan🇺🇸
Spin correlations of $Λ$ -hyperons embedded in the QCD strings formed in high energy collider experiments provide unique insight into their locality and entanglement features. We show from general considerations that while the Clauser-Horne-Shimony-Holt inequality is less stringent for such states, they provide a benchmark for quantum-to-classical transitions induced by varying i) the associated hadron multiplicity, ii) the spin of nucleons, iii) the separation in rapidity between pairs, and iv) the kinematic regimes accessed. These studies also enable the extraction of quantitative measures of quantum entanglement. We first explore such questions within a simple model of a QCD string composed of singlets of two partial distinguishable fermion flavors and compare analytical results to those obtained on quantum hardware. We further discuss a class of spin Hamiltonians that model the dynamics of $Λ$ spin correlations. Prospects for extracting quantum features of QCD strings from hyperon measurements at current and future colliders are outlined.
↳ hep-phnucl-exnucl-thquant-phPRD(2022)·91 citations
08
Charm-baryon semileptonic decays and the strange $Λ^{*}$ resonances: New insights from lattice QCD
Stefan Meinel🇺🇸 · Gumaro Rendon🇺🇸
Understanding the properties of the strange $Λ^{*}$ baryon resonances is a long-standing and fascinating problem. $Λ_{c}$ charm-baryon semileptonic weak decays to these resonances are highly sensitive to their internal structure and can be used to test theoretical models. We have performed the first lattice-QCD computation of the form factors governing $Λ_{c}$ semileptonic decays to a $Λ^{*}$ resonance: the $Λ^{*} (1520)$ , which has negative parity and spin $3/2$ . Here we present the resulting Standard-Model predictions of the $Λ_{c} \to Λ^{*} (1520) ℓ^{+} ν_{ℓ}$ differential and integrated decay rates as well as angular observables. Furthermore, by combining the recent BESIII measurement of the $Λ_{c} \to X e^{+} ν_{e}$ inclusive semipositronic branching fraction [Phys. Rev. Lett. 121, 251801 (2018)] with lattice-QCD predictions of the $Λ_{c} \to Λ e^{+} ν_{e}$ , $Λ_{c} \to n e^{+} ν_{e}$ , and $Λ_{c} \to Λ^{*} (1520) e^{+} ν_{e}$ decay rates, we obtain an upper limit on the sum of the branching fractions to all other semipositronic final states. In particular, this upper limit constrains the $Λ_{c} \to Λ^{*} (1405) e^{+} ν_{e}$ branching fraction to be very small, which may be another hint for a molecular structure of the $Λ^{*} (1405)$ .
↳ hep-phhep-exhep-latnucl-thPRD(2022)·20 citations
09
$Λ_{c} \to Λ^{*} (1520)$ form factors from lattice QCD and improved analysis of the $Λ_{b} \to Λ^{*} (1520)$ and $Λ_{b} \to Λ_{c}^{*} (2595, 2625)$ form factors
Stefan Meinel🇺🇸 · Gumaro Rendon🇺🇸
We present the first lattice-QCD calculation of the form factors governing the charm-baryon semileptonic decays $Λ_{c} \to Λ^{*} (1520) ℓ^{+} ν_{ℓ}$ . As in our previous calculation of the $Λ_{b} \to Λ^{*} (1520)$ form factors, we work in the $Λ^{*} (1520)$ rest frame, but here we use four different heavy-baryon momenta instead of just two. Because of the lower mass of the $Λ_{c}$ , the moderately-sized momenta used here are sufficient to determine the form factors in the full kinematic range of the semileptonic decay. We also update the analysis of our lattice results for the $Λ_{b} \to Λ^{*} (1520)$ and $Λ_{b} \to Λ_{c}^{*} (2595, 2625)$ form factors by imposing exact relations among the different form factors at zero recoil that follow from rotational symmetry. Imposing these relations ensures the correct behavior of the angular observables near the endpoint.
↳ hep-lathep-exhep-phnucl-thPRD(2022)·64 citations
10
Impact of W and Z Production Data and Compatibility of Neutrino DIS Data in Nuclear Parton Distribution Functions
K. F. Muzakka🇩🇪 · P. Duwentäster🇩🇪 · T. J. Hobbs🇺🇸 · T. Ježo🇩🇪 · M. Klasen🇩🇪 · K. Kovařík🇩🇪 · A. Kusina🇵🇱 · J. G. Morfín🇺🇸 · F. I. Olness🇺🇸 · R. Ruiz🇵🇱 · I. Schienbein🇫🇷 · J. Y. Yu🇫🇷
Vector boson production and neutrino deep-inelastic scattering (DIS) data are crucial for constraining the strange quark parton distribution function (PDF) and more generally for flavor decomposition in PDF extractions. We extend the nCTEQ15 nuclear PDFs (nPDFs) by adding the recent $W$ and $Z$ production data from the LHC in a global nPDF fit. The new nPDF set, referred to as nCTEQ15WZ, is used as a starting point for a follow-up study in which we assess the compatibility of neutrino DIS data with charged lepton DIS data. Specifically, we re-analyze neutrino DIS data from NuTeV, Chorus, and CDHSW, as well as dimuon data from CCFR and NuTeV. To scrutinize the level of compatibility, different kinematic regions of the neutrino data are investigated. Fits to the neutrino data alone and a preliminary global fit are performed and compared to nCTEQ15WZ.
↳ hep-phnucl-thSciPost Phys.Proc.(2022)·2 citations
11
Reweighting the quark Sivers function with STAR jet data
Carlo Flore🇫🇷 · Maria Elena Boglione🇮🇹 · Umberto D'Alesio🇮🇹 · Josè Osvaldo Gonzalez-Hernandez🇮🇹 · Francesco Murgia🇮🇹 · Alexei Prokudin🇺🇸
The Bayesian reweighting procedure is applied for the first time to a TMD distribution, the quark Sivers function extracted from SIDIS data. By exploiting the recent published single spin asymmetry data for the inclusive jet production in $p^{↑} p$ collisions from the STAR collaboration at RHIC, we show how such a procedure allows to incorporate the information contained in the new data set, without the need of re-fitting, and to explore a much wider $x$ region compared to SIDIS measurements. The reweighting method is also extended to the case of asymmetric errors, and the results show a significant improvement on the knowledge of the quark Sivers function.
↳ hep-phhep-exnucl-thSciPost Phys.Proc.(2022)·1 citation
12
NLO inclusive $J / ψ$ photoproduction at large $P_{T}$ at HERA and the EIC
Carlo Flore🇫🇷 · Jean-Philippe Lansberg🇫🇷 · Hua-Sheng Shao🇫🇷 · Yelyzaveta Yedelkina🇫🇷
We study inclusive $J / ψ$ photoproduction at NLO at large $P_{T}$ at HERA and the EIC. Our computation includes NLO QCD leading- $P_{T}$ corrections, QED contributions via an off-shell photon as well as those from $J / ψ$ +charm channels. For the latter, we employ the variable-flavour-number scheme. Our results are found to agree with the latest HERA data by H1 and provide, for the first time, a reliable estimate of the EIC reach for such a measurement. Finally, we demonstrate the observability of $J / ψ$ +charm production and the sensitivy to probe the non-perturbative charm content of the proton at high $x$ , also known as intrinsic charm, at the EIC.
↳ hep-phhep-exnucl-thSciPost Phys.Proc.(2022)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE

Measurement of Bell-type inequalities and quantum entanglement from Λ-hyperon spin correlations at high energy colliders

Charm-baryon semileptonic decays and the strange Λ∗ resonances: New insights from lattice QCD

Λc​→Λ∗(1520) form factors from lattice QCD and improved analysis of the Λb​→Λ∗(1520) and Λb​→Λc∗​(2595,2625) form factors

Impact of W and Z Production Data and Compatibility of Neutrino DIS Data in Nuclear Parton Distribution Functions

Reweighting the quark Sivers function with STAR jet data

NLO inclusive J/ψ photoproduction at large PT​ at HERA and the EIC

Affiliations

Measurement of Bell-type inequalities and quantum entanglement from $Λ$ -hyperon spin correlations at high energy colliders

Charm-baryon semileptonic decays and the strange $Λ^{*}$ resonances: New insights from lattice QCD

$Λ_{c} \to Λ^{} (1520)$ form factors from lattice QCD and improved analysis of the $Λ_{b} \to Λ^{} (1520)$ and $Λ_{b} \to Λ_{c}^{*} (2595, 2625)$ form factors

NLO inclusive $J / ψ$ photoproduction at large $P_{T}$ at HERA and the EIC