Fri·Jan 8, 2016Friday·January 8, 2016

1. 01*

   Forward-backward multiplicity correlations in pp, pPb and Pb+Pb collisions with the ATLAS detector

   Jiangyong Jia (for the ATLAS Collaboration)🇺🇸

   Two-particle pseudorapidity correlations are measured in 2.76 TeV Pb+Pb, 5.02 TeV pPb and 13 TeV pp collisions. Correlation function is measured using charged particles in the pseudorapidity range $|\eta |<2.4$ with transverse momentum $p_T>0.2$ GeV, and it is measured as a function of event multiplicity, defined by number of charged particles with $|\eta |<2.5$ and $p_T>0.4$ GeV. The correlation function is decomposed into a short-range component (SRC) and a long-range component (LRC). The SRC differs significantly between the opposite-charge pairs and same-charge pairs, and between the three collision systems at similar multiplicity. The LRC is described approximately by $1+⟨a_1^2⟩{\eta }_1{\eta }_2$ in all collision systems over the full multiplicity range. The values of $⟨a_1^2⟩$ are consistent between the opposite-charge and same-charge pairs, and are similar for the three collision systems at similar multiplicity. The values of $⟨a_1^2⟩$ and the magnitude of the SRC both follow a power-law dependence on the event multiplicity.

   nucl-exNPA(2016)·6 citations
2. 02*

   Comment on an Effect Proposed by A.G. Lebed in Semiclassical Gravity

   B. Crowell

   A.G. Lebed has given an argument that when a hydrogen atom is transported slowly to a different gravitational potential, it has a certain probability of emitting a photon. He proposes a space-based experiment to detect this effect. I show here that his arguments also imply the existence of nuclear excitations, as well as an effect due to the earth's motion in the sun's potential. This is not consistent with previous results from underground radiation detectors. It is also in conflict with astronomical observations.

   nucl-exgr-qc1 citation
3. 03*

   Baryon Spectroscopy - Recent Results from the CBELSA/TAPS Experiment

   Jan Hartmann (CBELSA/TAPS collaboration)🇩🇪

   One of the remaining challenges within the standard model is to gain a good understanding of QCD in the non-perturbative regime. One key step toward this aim is baryon spectroscopy, investigating the spectrum and the properties of baryon resonances. To get access to resonances with small $\pi N$ partial width, photoproduction experiments provide essential information. In order to extract the contributing resonances, partial wave analyses need to be performed. Here, a complete experiment is required to unambiguously determine the contributing amplitudes. This involves the measurement of carefully chosen single and double polarization observables. The CBELSA/TAPS experiment with a longitudinally or transversely polarized target and an energy tagged, linearly or circularly polarized photon beam allows the measurement of a large set of polarization observables. Due to its good energy resolution, high detection efficiency for photons, and the nearly complete solid angle coverage it is ideally suited for the measurement of photoproduction of neutral mesons decaying into photons. Recent results for various double polarization observables in ${\pi }^0$ and $\eta$ photoproduction and their impact on the partial wave analysis are discussed.

   nucl-exAIP Conf.Proc.(2016)·1 citation
4. 04*

   Analysis Techniques for the Evaluation of the Neutrinoless Double-Beta Decay Lifetime in ${}^{130}$Te with CUORE-0

   CUORE Collaboration: C. Alduino🇺🇸 · K. Alfonso🇺🇸 · D. R. Artusa🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · T. I. Banks🇺🇸 · G. Bari🇮🇹 · J. W. Beeman🇺🇸 · F. Bellini🇮🇹 · A. Bersani🇮🇹 · M. Biassoni🇮🇹 · C. Brofferio🇮🇹 and 108 other authors

   We describe in detail the methods used to obtain the lower bound on the lifetime of neutrinoless double-beta ($0\nu \beta \beta$) decay in ${}^{130}$Te and the associated limit on the effective Majorana mass of the neutrino using the CUORE-0 detector. CUORE-0 is a bolometric detector array located at the Laboratori Nazionali del Gran Sasso that was designed to validate the background reduction techniques developed for CUORE, a next-generation experiment scheduled to come online in 2016. CUORE-0 is also a competitive $0\nu \beta \beta$ decay search in its own right and functions as a platform to further develop the analysis tools and procedures to be used in CUORE. These include data collection, event selection and processing, as well as an evaluation of signal efficiency. In particular, we describe the amplitude evaluation, thermal gain stabilization, energy calibration methods, and the analysis event selection used to create our final $0\nu \beta \beta$ decay search spectrum. We define our high level analysis procedures, with emphasis on the new insights gained and challenges encountered. We outline in detail our fitting methods near the hypothesized $0\nu \beta \beta$ decay peak and catalog the main sources of systematic uncertainty. Finally, we derive the $0\nu \beta \beta$ decay half-life limits previously reported for CUORE-0, $T_{1/2}^{0\nu }>2.7\times 10^{24}$ yr, and in combination with the Cuoricino limit, $T_{1/2}^{0\nu }>4.0\times 10^{24}$ yr.

   nucl-exhep-exphysics.ins-detPRC(2016)·120 citations
5. 05*

   Direct Evaluation of the Quark Content of Nucleons from Lattice QCD at the Physical Point

   A. Abdel-Rehim (The Cyprus Inst.)🇨🇾 · C. Alexandrou (Univ. of Cyprus and The Cyprus Inst.)🇨🇾 · M. Constantinou (The Cyprus Inst.)🇨🇾 · K. Hadjiyiannakou (Univ. of Cyprus and The Cyprus Inst.)🇨🇾 · K. Jansen (DESY-Zeuthen)🇩🇪 · Ch. Kallidonis (The Cyprus Inst.)🇨🇾 · G.Koutsou (The Cyprus Inst.)🇨🇾 · A. Vaquero Aviles-Casco (INFN, Milan)🇮🇹

   We evaluate the light, strange and charm scalar content of the nucleon using one lattice QCD ensemble generated with two degenerate light quarks with mass fixed to their physical value. We use improved techniques to evaluate the disconnected quark loops to sufficient accuracy to determine the strange and charm nucleon $\sigma$-terms. in addition to the light quark content ${\sigma }_{\pi N}$. We find ${\sigma }_{\pi N}$=$37.2(2.6){(}_{2.9}^{4.7})$ MeV ${\sigma }_s$=$41.1(8.2){(}_{5.8}^{7.8})$ MeV and ${\sigma }_c$=$79(21){(}_8^{12})$ MeV, where the first error is statistical and the second is the systematic error due to the determination of the lattice spacing, the assessment of finite volume and residual excited state effects.

   ↳ hep-lathep-phnucl-exnucl-thPRL(2016)·143 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.