Tue·Nov 11, 2014Tuesday·November 11, 2014

1. 01*

   Recent results from the search for the critical point of strongly interacting matter at the CERN SPS

   Grzegorz Stefanek (for the NA49 and NA61/SHINE Collaborations)🇵🇱

   Recent searches at the CERN SPS for evidence of the critical point of strongly interacting matter are discussed. Experimental results on theoretically expected signatures, such as event-to-event fluctuations of the particle multiplicity and the average transverse momentum as well as intermittency in particle production are presented.

   nucl-exNucl.Part.Phys.Proc.(2016)·6 citations
2. 02*

   Results on Heavy-Flavour Production in pp, p-Pb and Pb-Pb Collisions with ALICE at the LHC

   Grazia Luparello (for the ALICE Collaboration)🇮🇹

   The ALICE Collaboration has measured heavy-flavour production through the reconstruction of hadronic decays of D mesons at mid-rapidity and via semi-electronic (at mid-rapidity) and semi-muonic (at forward rapidity) decays of charm and beauty hadrons in pp, p-Pb and Pb-Pb collisions. A summary of the most recent results from p-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV and Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV is presented in this paper.

   nucl-ex1 citation
3. 03*

   Nucleon tensor charges and electric dipole moments

   Mario Pitschmann🇦🇹 · Chien-Yeah Seng🇺🇸 · Craig D. Roberts🇺🇸 · Sebastian M. Schmidt🇩🇪

   A symmetry-preserving Dyson-Schwinger equation treatment of a vector-vector contact interaction is used to compute dressed-quark-core contributions to the nucleon $\sigma$-term and tensor charges. The latter enable one to directly determine the effect of dressed-quark electric dipole moments (EDMs) on neutron and proton EDMs. The presence of strong scalar and axial-vector diquark correlations within ground-state baryons is a prediction of this approach. These correlations are active participants in all scattering events and thereby modify the contribution of the singly-represented valence-quark relative to that of the doubly-represented quark. Regarding the proton $\sigma$-term and that part of the proton mass which owes to explicit chiral symmetry breaking, with a realistic $d$-$u$ mass splitting the singly-represented $d$-quark contributes 37% more than the doubly-represented $u$-quark; and in connection with the proton's tensor charges, ${\delta }_{T}u$, ${\delta }_{T}d$, the ratio ${\delta }_{T}d/{\delta }_{T}u$ is 18% larger than anticipated from simple quark models. Of particular note, the size of ${\delta }_{T}u$ is a sensitive measure of the strength of dynamical chiral symmetry breaking; and ${\delta }_{T}d$ measures the amount of axial-vector diquark correlation within the proton, vanishing if such correlations are absent.

   ↳ nucl-thhep-lathep-phnucl-exPRD(2015)·74 citations
4. 04*

   Differences between Axions and Generic Light Scalars in Laboratory Experiments

   Sonny Mantry🇺🇸 · Mario Pitschmann🇦🇹 · Michael J. Ramsey-Musolf🇺🇸

   It is well-known that electric dipole moment (EDM) constraints provide the most stringent bounds on axion-mediated macroscopic spin-dependent (SD) and time reversal and parity violating (TVPV) forces. These bounds are several orders of magnitude stronger than those arising from direct searches in fifth-force experiments and combining astrophysical bounds on stellar energy loss with Eotvos tests of the weak equivalence principle (WEP). This is a consequence of the specific properties of the axion, invoked to solve the Strong CP problem. However, the situation is quite different for generic light scalars that are unrelated to the strong CP problem. In this case, bounds from fifth-force experiments and astrophysical processes are far more stringent than the EDM bounds, for the mass range explored in direct searches.

   ↳ hep-phnucl-ex5 citations
5. 05*

   136Sn and three body forces

   M. Saha Sarkar🇮🇳 · S. Sarkar🇮🇳

   New experimental data on 2+ energies of 136,138Sn confirms the trend of lower 2+ excitation energies of even-even tin isotopes with N > 82 compared to those with N< 82. However, none of the theoretical predictions using both realistic and empirical interactions can reproduce experimental data on excitation energies as well as the transition probabilities (B(E2; 6+ -> 4+)) of these nuclei, simultaneously, apart from one whose matrix elements have been changed empirically to produce mixed seniority states by weakening pairing. We have shown that the experimental result also shows good agreement with the theory in which three body forces have been included in a realistic interaction. The new theoretical results on transition probabilities have been discussed to identify the experimental quantities which will clearly distinguish between different views.

   ↳ nucl-thnucl-exPramana(2015)·2 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.