Tue·May 21, 2019Tuesday·May 21, 2019

1. 01*

   Results of CUORE

   S. Dell'Oro🇺🇸 · 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🇮🇹 and 100 other authors

   The Cryogenic Underground Observatory for Rare Events (CUORE) at the Laboratori Nazionali del Gran Sasso, Italy, is the world's largest bolometric experiment. The detector consists of an array of 988 TeO2 crystals, for a total mass of 742 kg. CUORE is presently in data taking, searching for the neutrinoless double beta decay of 130 Te. CUORE is operational since the spring of 2017. The initial science run already allowed to provide the most stringent limit on the neutrinoless double beta decay half-life of 130Te, and to perform the most precise measurement of the two-neutrino double beta decay half-life. Up to date, we have more than doubled the collected exposure. In this talk, we presenteded the most recent results and discuss the present status of the CUORE experiment.

   nucl-ex1 citation
2. 02*

   Towards the Limits of Existence of Nuclear Structure: Observation and First spectroscopy of the Isotope ${}^{31}$K by measuring its three-proton Decay

   D. Kostyleva🇩🇪 · I. Mukha🇩🇪 · L. Acosta🇲🇽 · E. Casarejos🇪🇸 · V. Chudoba🇷🇺 · A.A. Ciemny🇵🇱 · W. Dominik🇵🇱 · J.A. Dueñas🇪🇸 · V. Dunin🇷🇺 · J. M. Espino🇪🇸 · A. Estradé🇺🇸 · F. Farinon🇩🇪 and 36 other authors

   The most-remote from stability isotope ${}^{31}$K, which is located four atomic mass units beyond the proton drip line, has been observed. It is unbound in respect to three-proton ($3p$) emission, and its decays have been detected in flight by measuring trajectories of all decay products using micro-strip detectors. The $3p$-emission processes have been studied by means of angular correlations ${}^{28}$S+3$p$ and the respective decay vertexes. The energies of the previously-unknown ground and excited states of ${}^{31}$K have been determined. This provides its $3p$ separation-energy value $S_{3p}$ of $-4.6(2)$ MeV. Upper half-life limits of 10 ps of the observed ${}^{31}$K states have been derived from distributions of the measured decay vertexes.

   nucl-exPRL(2019)·21 citations
3. 03*

   Event shape and Multiplicity dependence of Freeze-out Scenario and System Thermodynamics in Proton+Proton Collisions at $\sqrt{s}$ = 13 TeV using PYTHIA8

   Sushanta Tripathy🇮🇳 · Ashish Bisht🇮🇳 · Raghunath Sahoo🇮🇳 · Arvind Khuntia🇵🇱 · Malavika Panikkassery Salvan🇮🇳

   Recent observations of QGP-like conditions in high-multiplicity pp collisions from ALICE experiment at the LHC warrants an introspection whether to use pp collisions as a baseline measurement to characterize heavy-ion collisions for possible formation of a Quark-Gluon Plasma. A double differential study of the particle spectra and thermodynamics of the produced system as a function of charged-particle multiplicity and transverse spherocity in pp collisions would shed light into the underlying event dynamics. Transverse spherocity, one of the event shape observables, allows to separate the events in terms of jetty and isotropic events. We analyse the identified particle transverse momentum ($p_{\mathrm{T}}$) spectra as a function of charged-particle multiplicity and transverse spherocity using Tsallis non-extensive statistics and Boltzmann-Gibbs Blastwave (BGBW) model in pp collisions at $\sqrt{s}$ = 13 TeV using PYTHIA8 event generator. The extracted parameters such as temperature ($T$), radial flow ($\beta$) and non-extensive parameter ($q$) are shown as a function of charged-particle multiplicity for different spherocity classes. We observe that the isotropic events approach to thermal equilibrium while the jetty ones remain far from equilibrium. We argue that, while studying the QGP-like conditions in small systems, one should separate the isotropic events from the spherocity-integrated events, as the production dynamics are different.

   ↳ hep-phhep-exnucl-exnucl-thAdv.High Energy Phys.(2021)·28 citations
4. 04*

   System size and Multiplicity dependence of Chemical freeze-out parameters at the Large Hadron Collider Energies

   Rutuparna Rath🇮🇳 · Arvind Khuntia🇵🇱 · Raghunath Sahoo🇮🇳

   The collision system and multiplicity dependence of chemical freeze-out temperature ($T_{\mathrm{ch}}$) and strangeness saturation factor (${\gamma }_s$) are obtained by studying the particle ratios at the Large Hadron Collider (LHC) energies. Here, we consider the new results in pp at 13 TeV, p+Pb at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV, Xe+Xe at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV and Pb+Pb at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV along with the earlier results in pp at $\sqrt{s}$ = 7 TeV and Pb+Pb at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV. A statistical thermal model is used to extract the chemical freeze-out parameters in different multiplicity classes. To understand the particle production from small to large collision systems two ensembles namely, canonical and grand canonical have been considered in this study. A clear observation of multiplicity dependence of $T_{\mathrm{ch}}$ and ${\gamma }_s$ is observed. The values obtained in high-multiplicity pp collisions are found to be similar to the peripheral Pb+Pb collisions. A final state midrapidity charged particle multiplicity density of around 20-30 appears to be a threshold below which, the chemical freeze-out temperature is lower than the kinetic freeze-out temperature.

   ↳ hep-phhep-exnucl-exnucl-th5 citations
5. 05*

   Correlating Tauonic B Decays to the Neutron EDM via a Scalar Leptoquark

   Andreas Crivellin🇨🇭 · Francesco Saturnino🇨🇭

   In this article we investigate the correlations between tauonic $B$ meson decays (e.g. $B\to \tau \nu$, $B\to D^{(\ast )}\tau \nu$, $B\to \pi \tau \nu$) and electric dipole moments (EDMs), in particular the one of the neutron, in the context of the $S_1$ scalar leptoquark (LQ). This LQ naturally arises in the R-parity violating MSSM as the right-handed down-squark. We perform the matching of this model on the effective field theory taking into account the leading renormalization group effect for the relevant observables. We find that one can explain the hints for new physics in $b\to c\tau \nu$ transitions without violating bounds from other observables. Even more interesting, it can also give sizable effects in $B\to \tau \nu$, to be tested at BELLE II, which are correlated to (chromo) electric dipole operators receiving $m_{\tau }/m_u$ enhanced contributions. Therefore, given a deviation from the Standard Model (SM) expectations in $B\to \tau \nu$, this model predicts a sizable neutron EDM. In fact, even if new physics has CP conserving real couplings, the CKM matrix induces a complex phase and already a 10\% change of the $B\to \tau \nu$ branching ratio (with respect to the SM) will lead to an effect observable with the n2EDM experiment at PSI.

   ↳ hep-phhep-exnucl-exPRD(2019)·41 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.