Tue·Jul 9, 2019Tuesday·July 9, 2019

1. 01*

   Measurement of ${\rm Y}(1\mathrm{S})$ elliptic flow at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

   ALICE Collaboration

   The first measurement of the ${\rm Y}(1\mathrm{S})$ elliptic flow coefficient ($v_2$) is performed at forward rapidity (2.5 $<$ $y$ $<$ 4) in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC. The results are obtained with the scalar product method and are reported as a function of transverse momentum ($p_{\mathrm{T}}$) up to 15 GeV/$c$ in the 5-60% centrality interval. The measured ${\rm Y}(1\mathrm{S})$ $v_2$ is consistent with zero and with the small positive values predicted by transport models within uncertainties. The $v_2$ coefficient in 2 $<$ $p_{\mathrm{T}}$ $<$ 15 GeV/$c$ is lower than that of inclusive J/$\psi$ mesons in the same $p_{\mathrm{T}}$ interval by 2.6 standard deviations. These results, combined with earlier suppression measurements, are in agreement with a scenario in which the ${\rm Y}$(1S) production in Pb-Pb collisions at LHC energies is dominated by dissociation limited to the early stage of the collision whereas in the J/$\psi$ case there is substantial experimental evidence of an additional regeneration component.

   nucl-exhep-exPRL(2019)·85 citations
2. 02*

   Hyperon I: Partial wave amplitudes for $K^{-}p$ scattering

   M.~Matveev · A.V.~Sarantsev · V.A. Nikonov🇩🇪 · A.V. Anisovic · U. Thoma🇩🇪 · E. Klempt🇩🇪

   Early data on $K^{-}$ induced reactions off protons are collected and used in a coupled-channel partial wave analysis (PWA). Data which had been published in the form of Legendre coefficients are included in the PWA. In a {\it primary} fit using 3* and 4* resonances only, we observe some significant discrepancies with the data. In a systematic search for new $\Lambda$ and $\Sigma$ hyperon resonances, additional candidates are found. The significance of the known and of the additional resonances is evaluated. Seventeen resonances listed with 1* or 2* and one resonance listed with 3* in the Review of Particle Properties cannot be confirmed, five new hyperons are suggested. The partial-wave amplitudes deduced in this analysis are compared to those from other analyses.

   nucl-exEPJA(2019)·30 citations
3. 03*

   Theory of elastic neutrino-electron scattering

   Oleksandr Tomalak🇩🇪 · Richard J Hill🇺🇸

   Theoretical predictions for elastic neutrino-electron scattering have no hadronic or nuclear uncertainties at leading order making this process an important tool for normalizing neutrino flux. However, the process is subject to large radiative corrections that differ according to experimental conditions. In this paper, we collect new and existing results for total and differential cross sections accompanied by radiation of one photon, $\nu e\to \nu e(\gamma )$. We perform calculations within the Fermi effective theory and provide analytic expressions for the electron energy spectrum and for the total electromagnetic energy spectrum as well as for double- and triple-differential cross sections with respect to electron energy, electron angle, photon energy, and photon angle. We discuss illustrative applications to accelerator-based neutrino experiments and provide the most precise up-to-date values of neutrino-electron scattering cross sections. We present an analysis of theoretical error, which is dominated by the $\sim 0.2-0.4\%$ uncertainty of the hadronic correction. We also discuss how searches for new physics can be affected by radiative corrections.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2020)·78 citations
4. 04*

   Towards high-order calculations of three-nucleon scattering in chiral effective field theory

   E. Epelbaum🇩🇪 · J. Golak🇵🇱 · K. Hebeler🇩🇪 · H. Kamada🇯🇵 · H. Krebs🇩🇪 · U.-G. Meißner🇩🇪 · A. Nogga🇩🇪 · P. Reinert🇩🇪 · R. Skibiński🇵🇱 · K. Topolnicki🇵🇱 · Y. Volkotrub🇵🇱 · H. Witała🇵🇱

   We discuss the current status of chiral effective field theory in the three-nucleon sector and present selected results for nucleon-deuteron scattering observables based on semilocal momentum-space-regularized chiral two-nucleon potentials together with consistently regularized three-nucleon forces up to third chiral order. Using a Bayesian model for estimating truncation errors, the obtained results are found to provide a good description of the experimental data. We confirm our earlier findings that a high-precision description of nucleon-deuteron scattering data below pion production threshold will require the theory to be pushed to fifth chiral order. This conclusion is substantiated by an exploratory study of selected short-range contributions to the three-nucleon force at that order, which, as expected, are found to have significant effects on polarization observables at intermediate and high energies. We also outline the challenges that will need to be addressed in order to push the chiral expansion of three-nucleon scattering observables to higher orders.

   ↳ nucl-thnucl-exEPJA(2020)·96 citations
5. 05*

   Phonon and light read out of a Li${}_2$MoO${}_4$ crystal with multiplexed kinetic inductance detectors

   N. Casali🇮🇹 · L. Cardani🇮🇹 · I. Colantoni🇮🇹 · A. Cruciani🇮🇹 · S. Di Domizio🇮🇹 · M. Martinez🇮🇹 · G. Pettinari🇮🇹 · M. Vignati🇮🇹

   Molybdenum based crystals such as Li${}_2$MoO${}_4$ and CaMoO${}_4$ are emerging as leading candidates for next generation experiments searching for neutrino-less double beta decay with cryogenic calorimeters (CUPID, AMoRE). The exquisite energy resolution and high radio-purity of these crystals come at the cost of a potentially detrimental background source: the two neutrinos double beta decay of ${}^{100}$Mo. Indeed, the fast half-life of this decay mode, combined with the slow response of cryogenic calorimeters, would result in pile-up events in the energy region of interest for neutrino-less double beta decay, reducing the experimental sensitivity. This background can be suppressed using fast and high sensitivity cryogenic light detectors, provided that the scintillation time constant itself does not limit the time resolution. We developed a new detection technique exploiting the high sensitivity, the fast time response and the multiplexing capability of Kinetic Inductance Detectors. We applied the proposed technique to a $2\times 2\times 2$ cm${}^3$ Li${}_2$MoO${}_4$ crystal, which was chosen as baseline option for CUPID. We measured simultaneously both the phonon and scintillation signals with KIDs. We derived the scintillation time constant of this compound at millikelvin temperatures obtaining ${\tau }_{scint}=84.5\pm 4.5(\mathrm{syst})\pm 1.0(\mathrm{stat})$ $\mu$s, constant between 10 and 190 mK.

   ↳ physics.ins-dethep-exnucl-exEPJC(2019)·16 citations
6. 06*

   Scale and Scheme Independence and Position-Momentum Equivalence of Nuclear Short-Range Correlations

   R. Cruz-Torres🇺🇸 · D. Lonardoni🇺🇸 · R. Weiss🇮🇱 · N. Barnea🇮🇱 · D. W. Higinbotham🇺🇸 · E. Piasetzky🇮🇱 · A. Schmidt🇺🇸 · L. B. Weinstein🇺🇸 · R. B. Wiringa🇺🇸 · O. Hen🇺🇸

   Ab-initio Quantum Monte Carlo (QMC) calculations of nuclei from deuterium to 40Ca, obtained using four different phenomenological and local chiral nuclear potentials, are analyzed using the Generalized Contact Formalism (GCF). We extract spin- and isospin-dependent "nuclear contact terms" for each interaction in both coordinate and momentum space. The extracted contact terms, that count the number of short-range correlated (SRC) pairs with different quantum numbers, are dependent on the nuclear interaction model used in the QMC calculation. However, the ratios of contact terms for a nucleus A to deuterium (for spin-1 pn pairs) or to 4He (for all NN pairs) are independent of the nuclear interaction model and are the same for both short-distance and high-momentum pairs. This implies that the relative abundance of short-range pairs in the nucleus is a long-range (mean-field) quantity that is insensitive to the short-distance nature of the nuclear force. Measurements of exclusive (e,e'NN) pair breakup processes are instead more sensitive to short-range dynamics

   ↳ nucl-thnucl-exNat.Phys.(2021)·104 citations
7. 07*

   Linearly polarized gluons at next-to-next-to leading order and the Higgs transverse momentum distribution

   Daniel Gutierrez-Reyes🇪🇸 · Sergio Leal-Gomez🇪🇸 · Ignazio Scimemi🇪🇸 · Alexey Vladimirov🇩🇪

   We calculate the small-b (or large-qT) matching of transverse momentum dependent (TMD) distribution for linearly polarized gluons to the integrated gluon distributions at the next-to-next-to-leading order (NNLO). This is the last missing part for the complete NNLO prediction of the Higgs spectrum within TMD factorization. We discuss the numerical impact of the correction so derived to the qT-differential cross-section for Higgs boson production and to the positivity bound for linearly polarized gluon transverse momentum distribution.

   ↳ hep-phhep-exhep-latnucl-ex+1JHEP(2019)·79 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.