Journals
2016 EN
STAR Collaboration · L. Adamczyk · J. K. Adkins
+326 more
We present the measurement of the transverse single-spin asymmetry of weakboson production in transversely polarized proton-proton collisions at$\sqrt{s} = 500~\text{GeV}$ by the STAR experiment at RHIC. The measuredobservable is sensitive to the Sivers function, one of the transverse momentumdependent parton distribution functions, which is predicted to have theopposite sign in proton-proton collisions from that observed in deep inelasticlepton-proton scattering. These data provide the first experimentalinvestigation of the non-universality of the Sivers function, fundamental toour understanding of QCD.
American Physical Society
Journals
2016 EN
H. C. Xu · X. H. Niu · D. F. Xu
+7 more
FeSe exhibits a novel ground state in which superconductivity coexists with anematic order in the absence of any long-range magnetic order. Here we reportan angle-resolved photoemission study on the superconducting gap structure inthe nematic state of FeSe$_{0.93}$S$_{0.07}$, without the complication causedby Fermi surface reconstruction induced by magnetic order. We found that thesuperconducting gap shows a pronounced 2-fold anisotropy around the ellipticalhole pocket near the Z point of the Brillouin zone, with gap minima at theendpoints of its major axis, while no detectable gap was observed around thezone center and zone corner. The large anisotropy and nodal gap distributiondemonstrate the substantial effects of the nematicity on the superconductivity,and thus put strong constraints on the current theories.
American Physical Society
Journals
2016 EN
STAR Collaboration · L. Adamczyk · J. K. Adkins
+337 more
We present the first measurement of charge-dependent directed flow in Cu+Aucollisions at $\sqrt{s_{_{NN}}}$ = 200 GeV. The results are presented as afunction of the particle transverse momentum and pseudorapidity for differentcentralities. A finite difference between the directed flow of positive andnegative charged particles is observed that qualitatively agrees with theexpectations from the effects of the initial strong electric field between twocolliding ions with different nuclear charges. The measured difference indirected flow is much smaller than that obtained from theparton-hadron-string-dynamics (PHSD) model, which suggests that most of theelectric charges, i.e. quarks and antiquarks, have not yet been created duringthe lifetime of the strong electric field, which is of the order of, or lessthan, 1fm/$c$.
American Physical Society
Journals
2016 EN
STAR Collaboration · L. Adamczyk · J. K. Adkins
+334 more
We report the first di-jet transverse momentum asymmetry measurements fromAu+Au and p+p collisions at RHIC. The two highest-energy back-to-back jetsreconstructed from fragments with transverse momenta above 2 GeV/c display asignificantly stronger momentum imbalance in heavy-ion collisions than in thep+p reference. When re-examined with correlated soft particles included, weobserve that these di-jets then exhibit a unique new feature -- momentumbalance is restored to that observed in p+p for a jet resolution parameter ofR=0.4, while re-balancing is not attained with a smaller value of R=0.2.
American Physical Society
Journals
2016 EN
Makarova Irina · Grebenev Vadim · Dmitricheva Elena
+4 more
Cs 3 (HSO 4 ) 2 (H 2 PO 4 ) and Cs 4 (HSO 4 ) 3 (H 2 PO 4 ) single crystals were obtained for the first time based on a systematic study of the phase diagram of the CsHSO 4 –CsH 2 PO 4 –H 2 O ternary system. To reveal the structural conditionality for anomalies in physical properties, including dielectric and optical properties, diffraction studies of the crystal structure of Cs 3 (HSO 4 ) 2 (H 2 PO 4 ) and Cs 4 (HSO 4 ) 3 (H 2 PO 4 ) were performed, and their common structural features and differences were analyzed.
International Union of Crystallography
Journals
2016 EN
KISELEV N.A. · KUMSKOV A.S. · ZHIGALINA V.G.
+5 more
Summary HRTEM and HAADF STEM of 1DTbBr x @SWCNT meta‐nanotubes reveal three structural modifications of 1D nanocrystals within single wall carbon nanotube channels attributed to a different stoichiometry of the guest crystal. For SWCNTs with diameters D m > 1.4 nm a most complete tetragonal unit cell is observed. When crystallization occurs inside SWCNT with D m < 1.4 nm 1D TbBr x crystal deforms a nanotube to elliptical shape in cross section. In this case the 1D crystal unit cell becomes monoclinic, with possible loss of a part of bromine atoms. Two modifications of a monoclinic unit cell appear. One of them is characterized by single or pair vacancies in the structure of the 1D crystal. Another structure is explained by peripheral and central bromine atoms loss. An appearance of such modifications can be stimulated by electron irradiation. The loss of bromine atoms is in agreement with chemical analysis data. Electronic properties of obtained meta‐nanotubes are investigated using optical absorption and Raman spectroscopy. It is shown that intercalation of terbium bromide into SWCNTs leads to acceptor doping of SWCNTs. According to local EDX analysis and elemental mapping this doping can arise from significant stoichiometry change in 1D nanocrystal indicating an average Tb:Br atomic ratio of 1:2.8 ± 0.1.
Journals
2016 EN
Baak Christiaan G.C. · Radionova Eleanora P. · Golovina Larisa A.
+4 more
Objective utilization of data from DSDP Site 380 (Black Sea) Christiaan G.C. van Baak, Eleanora P. Radionova, Larisa A. Golovina, Isabella Raffi, Klaudia F. Kuiper, Iuliana Vasiliev and Wout Krijgsman Paleomagnetic Laboratory “Fort Hoofddijk”, Utrecht University, Budapestlaan 17, Utrecht 3584CD, The Netherlands; Geological Institute, Russian Academy of Sciences (RAS), Pyzhevsky per. 7, Moscow 119017, Russia; Department of Engineering and Geology, Universit a “G. d’Annunzio”, Via dei Vestini 31, Chieti Scalo 66013, Italy; Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, Amsterdam 1081 HV, The Netherlands
Journals
2016 EN
O. A. Gelfond · M. A. Vasiliev
Current interaction of massless fields in four dimensions is shown to breaksp (8) symmetry of free massless equations of all spins down to the conformalsymmetry su (2,2). This breaking is in agreement with the form of nonlinearhigher-spin field equations.
Journals
2016 EN
Аlexander Vasiliev
We propose a generalization of the quantum hashing technique based on the notion of small-bias sets. These sets have proved useful in different areas of computer science, and here their properties give an optimal construction for succinct quantum presentation of elements of any finite abelian group, which can be used in various computational and cryptographic scenarios. We consider two special cases of the proposed quantum hashing which turn out to be the known quantum fingerprinting schemas.
Journals
2016 EN
G. Agakishiev · O. Arnold · A. Bałanda
+109 more
International audienceThe HADES data from p + Nb collisions at a center-of-mass energy of GeV are analyzed employing a statistical hadronization model. The model can successfully describe the production yields of the identified hadrons , , , K 0 s, with parameters MeV and MeV, which fit well into the chemical freeze-out systematics found in heavy-ion collisions. In addition, we reanalyze our previous HADES data from Ar + KCl collisions at GeV with an updated version of the model. We address equilibration in heavy-ion collisions by testing two aspects: the description of yields and the regularity of freeze-out parameters from a statistical model fit as a function of colliding energy and system size. Despite its success, the model fails to describe the observed yields in both, p + Nb and Ar + KCl . Special emphasis is put on feed-down contributions from higher-lying resonance states as a possible explanation for the observed excess
Springer Science+Business Media