Mon·Apr 2, 2018Monday·April 2, 2018

1. 01*

   Search for Exotic Gluonic States in the Nucleus, A Letter of Intent to Jefferson Lab PAC 44

   J. Maxwell🇺🇸 · D. Crabb🇺🇸 · D. Day🇺🇸 · W. Detmold🇺🇸 · R. Jaffe🇺🇸 · M. Jones🇺🇸 · C. Keith🇺🇸 · D. Keller🇺🇸 · D. Meekins🇺🇸 · R. Milner🇺🇸 · J. Pierce🇺🇸 · O.A. Rondon🇺🇸 · P. Shanahan🇺🇸

   We renew our intent to submit a proposal to perform a search for a non-zero value of the unmeasured hadronic double helicity flip structure function $\Delta (x,Q^2)$, predicted to be sensitive to gluons in the nucleus. This would be performed with an unpolarized electron beam and transversely polarized, spin-1, nuclear target. This structure function was first identified by Jaffe and Manohar in 1989 as "a clear signature for exotic gluonic components in the target," and a recent lattice QCD result by our collaborators has prompted renewed interest in the topic. An inclusive search with deep inelastic scattering, below $x$ of 0.3, via single spin tensor asymmetries may be feasible using the CEBAF 12 GeV electron beam and JLab/UVa solid polarized target, and would represent the first experimental exploration of this quantity.

   nucl-ex9 citations
2. 02*

   The Majorana Demonstrator Status and Preliminary Results

   C. -H. Yu (1)🇺🇸 · S. I. Alvis (2)🇺🇸 · I. J. Arnquist (3)🇺🇸 · F. T. Avignone III (1 and 4)🇺🇸 · A. S. Barabash (5)🇷🇺 · C. J. Barton (6)🇺🇸 · F. E. Bertrand (1)🇺🇸 · T. Bode (7)🇩🇪 · V. Brudanin (8)🇷🇺 · M. Busch (9 and 10)🇺🇸 · M. Buuck (2)🇺🇸 · T. S. Caldwell (9 and 11)🇺🇸 and 54 other authors

   The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q${}_{\beta \beta }$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data.

   nucl-exphysics.ins-detEPJ Web Conf.(2018)·1 citation
3. 03*

   Correlations and Event-by-Event Fluctuations in High Multiplicity Events Produced in ${}^{208}$Pb-${}^{208}$Pb Collisions

   Shakeel Ahmad🇮🇳 · Shaista Khan🇮🇳 · Ashwini Kumar🇮🇳 · Arpit Singh🇮🇳 · A. Ahmad🇮🇳 · B. K. Singh🇮🇳

   Analysis of high multiplicity events produced in 158A GeV/c ${}^{208}$Pb-${}^{208}$Pb collisions is carried out to study the event-by-event fluctuations. The findings reveal that the method of scaled factorial moments can be used to identify the events having densely populated narrow phase space bins. A few events sorted out adopting this approach are individually analyzed. It is observed that these events do exhibit large fluctuations in their pseudorapidity, $\eta$ and azimuthal angle, $\varphi$ distributions arising out due to some dynamical reasons. Two particle $\Delta \eta$-$\Delta \varphi$ correlation study applied to these events too indicates that some complex two-dimensional structure of significantly high magnitude are present in these events which might have some dynamical origin. The findings reveal that the method of scaled factorial moments may be used as an effective triggering for events with large dynamical fluctuations.

   ↳ hep-exhep-phnucl-exAdv.High Energy Phys.(2018)·2 citations
4. 04*

   Probing confinement by direct photons and dileptons

   V.V. Goloviznin🇺🇦 · A.V. Nikolskii🇷🇺 · A.M. Snigirev🇷🇺 · G.M. Zinovjev🇺🇦

   The intensive synchrotron radiation resulting from quarks interacting with the collective confining color field in relativistic heavy ion collisions is discussed. The spectrum of photons with large transverse momentum is calculated and compared with the experimental data to demonstrate the feasibility of this type of radiation. A study of the earlier predicted azimuthal anisotropy in the angular distribution of dileptons with respect to the three-momentum of the pair is performed as well. This boundary-induced mechanism of lepton pair production is shown to possess the features that are distinctly different from the standard mechanisms and can potentially provide an efficient probe of quark-gluon plasma formation.

   ↳ hep-phnucl-exnucl-thEPJA(2019)·6 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.