Tue·Dec 24, 2019Tuesday·December 24, 2019

1. 01*

   Searching for TMD-factorization breaking in p+p and p+A collisions: Color interactions in QCD

   Christine A. Aidala (University of Michigan)🇺🇸

   Dihadron and isolated direct photon-hadron angular correlations have been measured in $p$+$p$ and $p$+A collisions to investigate possible effects from transverse-momentum-dependent factorization breaking due to color exchange between partons involved in the hard scattering and the proton remnants. The correlations are sensitive to nonperturbative initial-state and final-state transverse momentum $k_T$ and $j_T$ in the azimuthal nearly back-to-back region $\Delta \varphi \sim \pi$. In this region, transverse-momentum-dependent evolution can be studied when several different hard scales are measured. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of \pout, the out-of-plane transverse momentum component perpendicular to the trigger particle, are measured. To quantify the magnitude of any transverse-momentum-dependent factorization breaking effects, calculations will need to be performed for comparison.

   nucl-exhep-ex1 citation
2. 02*

   Improved Limit on Neutrinoless Double-Beta Decay in ${}^{130}$Te with CUORE

   CUORE Collaboration: D. Q. Adams🇺🇸 · C. Alduino🇺🇸 · K. Alfonso🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · G. Bari🇮🇹 · F. Bellini🇮🇹 · G. Benato🇺🇸 · M. Biassoni🇮🇹 · A. Branca🇮🇹 · C. Brofferio🇮🇹 · C. Bucci🇮🇹 and 98 other authors

   We report new results from the search for neutrinoless double-beta decay in ${}^{130}$Te with the CUORE detector. This search benefits from a four-fold increase in exposure, lower trigger thresholds and analysis improvements relative to our previous results. We observe a background of $(1.38\pm 0.07)\cdot 10^{-2}$ counts$/($keV$\cdot$kg$\cdot$yr$)$ in the $0\nu \beta \beta$ decay region of interest and, with a total exposure of 372.5 kg$\cdot$yr, we attain a median exclusion sensitivity of $1.7\cdot 10^{25}$ yr. We find no evidence for $0\nu \beta \beta$ decay and set a $90\%$ CI Bayesian lower limit of $3.2\cdot 10^{25}$ yr on the ${}^{130}$Te half-life for this process. In the hypothesis that $0\nu \beta \beta$ decay is mediated by light Majorana neutrinos, this results in an upper limit on the effective Majorana mass of 75-350 meV, depending on the nuclear matrix elements used.

   nucl-exPRL(2020)·276 citations
3. 03*

   N${}^{\ast }$ Experiments and what they tell us about Strong QCD Physics

   Volker D. Burkert🇺🇸

   I give an overview on experimental studies of the spectrum and the structure of the excited states of the nucleon and what we can learn about their internal structure. One focus is on the efforts to obtain a more complete picture of the light-quark baryon excitation spectrum employing electromagnetic beams that will allow us to draw some conclusions on the symmetries underlying the spectrum. For the higher mass excitations, the full employment of coupled channel approaches is essential when searching for new excited states in the large amounts of data already accumulated in different channels involving a variety of polarization observables. The other focus is on the study of transition form factors and helicity amplitudes and their dependences on $Q^2$, especially on some of the more prominent resonances, especially $\Delta (1232){\frac{3}{2}}^{+}$, $N(1440){\frac{1}{2}}^{+}$, and negative parity states $N(1535){\frac{1}{2}}^{-}$, and $N(1675){\frac{5}{2}}^{-}$. These were obtained in pion and eta electroproduction experiments off proton targets and have already led to further insights in the active degrees-of-freedom as a function of the distance scale involved.

   nucl-exhep-lathep-phnucl-thEPJ Web Conf.(2020)·21 citations
4. 04*

   Diffractive deeply virtual Compton scattering

   Bernard Pire🇫🇷 · Lech Szymanowski🇵🇱 · Samuel Wallon🇫🇷

   Diffractive deeply virtual Compton scattering (DiDVCS) is the process ${\gamma }^{\ast }(-Q^2)+N\to {\rho }^0+{\gamma }^{\ast }(Q^{\prime 2})+N^{\prime }$, where N is a nucleon or light nucleus, in the kinematical regime of large rapidity gap between the ${\rho }^0$ and the final photon-nucleus system, and in the generalized Bjorken regime where both photon virtualities $Q^2$ and $Q^{\prime 2}$ are large. We show that this process has the unique virtue of combining the large diffractive cross sections at high energy with the tomographic ability of deeply virtual Compton scattering to scrutinize the quark and gluon content of nucleons and light nuclei. Its study at an electron-ion collider would enlighten the internal structure of hadrons.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2020)·21 citations
5. 05*

   Beyond mean-field boson-fermion description of odd nuclei

   Kosuke Nomura🇭🇷

   We develop a novel theoretical method for calculating spectroscopic properties of those nuclei with odd number of nucleons, that is based on the nuclear density functional theory and the particle-boson coupling scheme. Self-consistent mean-field calculation based on the DFT is performed to provide microscopic inputs to build the Hamiltonian of the interacting boson-fermion systems, which gives excitation spectra and transition rates of odd-mass nuclei. The method is successfully applied to identify the quantum shape phase transitions and the role of octupole correlations in odd-mass nuclei, and is extended further to odd-odd nuclear systems.

   ↳ nucl-thnucl-exActa Phys.Polon.Supp.(2020)·0 citations
6. 06*

   Radiative processes and jet modification at the EIC

   Ivan Vitev🇺🇸

   A U.S.-based Electron-Ion Collider will provide the ultimate capability to determine both the structure and properties of nucleons and nuclei, as well as how matter and energy can be transported through a strongly interacting quantum mechanical environment. The production and propagation of long-lived heavy subatomic particles is a unique and critical part of this planned decade-long research program. In these proceedings we report the derivation of all branching processes in nuclei that lead to a modification of semi-inclusive hadron production, jet cross sections, and jet substructure when compared to the vacuum. This work allows for their evaluation to any desired order in opacity. As an example, we show an application to the modification of light hadron and open heavy flavor fragmentation functions at the EIC. We discuss how this observable can shed light on the physics of hadronization and parton energy loss in large nuclei.

   ↳ hep-phnucl-exnucl-th4 citations
7. 07*

   First investigation of the response of solar cells to heavy ions above 1 AMeV

   A. Henriques🇫🇷 · B. Jurado🇫🇷 · J. Pibernat🇫🇷 · J. C. Thomas🇫🇷 · D. Denis-Petit🇫🇷 · T. Chiron🇫🇷 · L. Gaudefroy🇫🇷 · J. Glorius🇩🇪 · Yu. A. Litvinov🇩🇪 · L. Mathieu🇫🇷 · V. Méot🇫🇷 · R. Pérez-Sánchez🇫🇷 and 7 other authors

   Solar cells have been used since several decades for the detection of fission fragments at about 1 AMeV. The advantages of solar cells regarding their cost (few euros) and radiation damage resistance make them an interesting candidate for heavy ion detection and an appealing alternative to silicon detectors. A first exploratory measurement of the response of solar cells to heavy ions at energies above 1 AMeV has been performed at the GANIL facility, Caen, France. Such measurements were performed with 84Kr and 129Xe beams ranging from 7 to 13 AMeV. The energy and time response of several types of solar cells were studied. The best performance was observed for cells of 10x10 mm2, with an energy and time resolution of {\sigma}(E)/E=1.4% and 3.6 ns (FWHM), respectively. Irradiations at rates from a few hundred to 106 particles per second were also performed to investigate the behavior of the cells with increasing intensity.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2020)·4 citations
8. 08*

   Space Charge Effects in the S$\pi$RIT Time Projection Chamber

   C.Y. Tsang · J. Estee · R. Wang · J. Barney · G. Jhang · W.G. Lynch · Z.Q. Zhang · G. Cerizza · T. Isobe · M. Kaneko · M. Kurata-Nishimura · J.W. Lee and 3 other authors

   Time projection chambers (TPCs) are widely used in nuclear and particle physics. They are particularly useful when measuring reaction products from heavy ion collisions. Most nuclear experiments at low energy are performed in a fixed target configuration, in which the unreacted beam will pass through the detection volume. As the beam intensity increases, the buildup of positive ions created from the ionization of the detector gas by the beam creates the main source of space charge, distorting the nominal electric field of the TPC. This has a profound effect on the accuracy of the measured momenta of the emitted particles. In this paper we will discuss the magnitude of the effects and construct an observable more appropriate for fixed target experiments to study the effects. We also will present an algorithm for correcting the space charge and some of the implications it has on the momentum determination.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2020)·10 citations
9. 09*

   Scintillation Timing Characteristics of Common Plastics for Radiation Detection Excited With 120 GeV Protons

   Burak Bilki🇹🇷 · Nilay Bostan🇺🇸 · Ohannes Kamer Köseyan🇺🇸 · Emrah Tiras🇺🇸 · James Wetzel🇺🇸

   The timing characteristics of scintillators must be understood in order to determine which applications they are appropriate for. Polyethylene naphthalate (PEN) and polyethylene teraphthalate (PET) are common plastics with uncommon scintillation properties. Here, we report the timing characteristics of PEN and PET, determined by exciting them with 120 GeV protons. The test beam was provided by Fermi National Accelerator Laboratory, and the scintillators were tested at the Fermilab Test Beam Facility. PEN and PET are found to have dominant decay constants of 34.91 ns and 6.78 ns, respectively.

   ↳ physics.ins-dethep-exnucl-exTurk.J.Phys.(2020)·4 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.