Tue·Aug 18, 2020Tuesday·August 18, 2020

1. 01*

   Discovery vs. Precision in Nuclear Physics- A Tale of Three Scales

   Gerald A. Miller🇺🇸

   At least three length scales are important in gaining a complete understanding of the physics of nuclei. These are the radius of the nucleus, the average inter-nucleon separation distance, and the size of the nucleon. The connections between the different scales are examined by using examples that demonstrate the direct connection between short-distance and high momentum transfer physics and also that significant high momentum content of wave functions is inevitable. The nuclear size is connected via the independent-pair approximation to the nucleon-nucleon separation distance, and this distance is connected via the concept of virtuality to the EMC effect. An explanation of the latter is presented in terms of light-front holographic wave functions of QCD. The net result is that the three scales are closely related, so that a narrow focus on any given specific range of scales may prevent an understanding of the fundamental origins of nuclear properties. It is also determined that, under certain suitable conditions, experiments are able to measure the momentum dependence of wave functions.

   ↳ nucl-thhep-phnucl-exPRC(2020)·9 citations
2. 02*

   Ab initio neutrinoless double-beta decay matrix elements for 48Ca, 76Ge, and 82Se

   A. Belley🇨🇦 · C. G. Payne🇨🇦 · S. R. Stroberg🇺🇸 · T. Miyagi🇨🇦 · J. D. Holt🇨🇦

   We calculate basis-space converged neutrinoless $\beta \beta$ decay nuclear matrix elements for the lightest candidates: 48Ca, 76Ge and 82Se. Starting from initial two- and three-nucleon forces, we apply the ab initio in-medium similarity renormalization group to construct valence-space Hamiltonians and consistently transformed $\beta \beta$-decay operators. We find that the tensor component is non-negligible in 76Ge and 82Se, and resulting nuclear matrix elements are overall 25-45% smaller than those obtained from the phenomenological shell model. While a final matrix element with uncertainties still requires substantial developments, this work nevertheless opens a path toward a true first-principles calculation of neutrinoless $\beta \beta$ decay in all nuclei relevant for ongoing large-scale searches.

   ↳ nucl-thhep-phnucl-exPRL(2021)·132 citations
3. 03*

   Supernova Neutrino Burst Detection with the Deep Underground Neutrino Experiment

   DUNE collaboration: B. Abi · R. Acciarri · M. A. Acero · G. Adamov · D. Adams · M. Adinolfi · Z. Ahmad · J. Ahmed · T. Alion · S. Alonso Monsalve · C. Alt · J. Anderson and 961 other authors

   The Deep Underground Neutrino Experiment (DUNE), a 40-kton underground liquid argon time projection chamber experiment, will be sensitive to the electron-neutrino flavor component of the burst of neutrinos expected from the next Galactic core-collapse supernova. Such an observation will bring unique insight into the astrophysics of core collapse as well as into the properties of neutrinos. The general capabilities of DUNE for neutrino detection in the relevant few- to few-tens-of-MeV neutrino energy range will be described. As an example, DUNE's ability to constrain the ${\nu }_e$ spectral parameters of the neutrino burst will be considered.

   ↳ hep-exastro-ph.IMastro-ph.SRnucl-ex+1EPJC(2021)·233 citations
4. 04*

   Triangle singularity as the origin of $X_0(2900)$ and $X_1(2900)$ observed in $B^{+}\to D^{+}{D}^{-}{K}^{+}$

   Xiao-Hai Liu🇨🇳 · Mao-Jun Yan🇨🇳 · Hong-Wei Ke🇨🇳 · Gang Li🇨🇳 · Ju-Jun Xie🇨🇳

   The LHCb collaboration reported the observation of a narrow peak in the $D^{-}{K}^{+}$ invariant mass distributions from the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decay. The peak is parameterized in terms of two resonances $X_0(2900)$ and $X_1(2900)$ with the quark contents $\bar{c}\bar{s}ud$, and their spin-parity quantum numbers are $0^{+}$ and $1^{-}$, respectively. We investigate the rescattering processes which may contribute to the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decays. It is shown that the $D^{\ast -}{K}^{\ast +}$ rescattering via the ${\chi }_{c1}{K}^{\ast +}{D}^{\ast -}$ loop or the ${\bar{D}}_1^0{K}^0$ rescattering via the $D_{sJ}^{+}{\bar{D}}_1^0{K}^0$ loop simulate the $X_0(2900)$ and $X_1(2900)$ structures. Such phenomena are due to the analytical property of the scattering amplitudes with the triangle singularities located to the vicinity of the physical boundary.

   ↳ hep-phhep-exnucl-exnucl-thEPJC(2020)·94 citations
5. 05*

   Dibaryons: Molecular versus Compact Hexaquarks

   H. Clement🇩🇪 · T. Skorodko🇩🇪

   Hexaquarks constitute a natural extension of complex quark systems like also tetra- and pentaquarks do. To this end the current status of $d^{\ast }(2380)$ in both experiment and theory is shortly reviewed. Recent high-precision measurements in the nucleon-nucleon channel and analyses thereof have established $d^{\ast }(2380)$ as an indisputable resonance in the long-sought dibaryon channel. Important features of this $I(J^P)=0(3^{+})$ state are its narrow width and its deep binding relative to the $\Delta (1232)\Delta (1232)$ threshold. Its decay branchings favor theoretical calculations predicting a compact hexaquark nature of this state. We review the current status of experimental and theoretical studies on $d^{\ast }(2380)$ as well as new physics aspects it may bring in the future. In addition, we review the situation at the $\Delta (1232)N$ and $N^{\ast }(1440)N$ thresholds, where evidence for a number of resonances of presumably molecular nature have been found -- similar to the situation in charmed and beauty sectors. Finally we briefly discuss the situation of dibaryon searches in the flavored quark sectors.

   ↳ nucl-thhep-exhep-phnucl-exCPC(2021)·29 citations
6. 06*

   TMD factorization for dijet and heavy-meson pair in DIS

   Rafael F. del Castillo🇪🇸 · Miguel G. Echevarria🇪🇸 · Yiannis Makris🇮🇹 · Ignazio Scimemi🇪🇸

   We study a transverse momentum dependent (TMD) factorization framework for the processes of di-jet and heavy meson pair production in deep-inelastic-scattering in an electron-proton collider, considering the measurement of the transverse momentum imbalance of the two hard probes in the Breit frame. For the factorization theorem we employ soft-collinear and boosted-heavy-quark effective field theories. The factorized cross-section for both processes is sensitive to gluon unpolarized and linearly polarized TMD distributions and requires the introduction of a new soft function. We calculate the new soft function here at one loop, regulating rapidity divergences with the $\delta$-regulator. In addition, using a factorization consistency relation and a universality argument regarding the heavy-quark jet function, we obtain the anomalous dimension of the new soft function at two loops.

   ↳ hep-phnucl-exnucl-thJHEP(2021)·51 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.