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Now showing items 1 - 16 of 303

  • J/Psi production at the STAR experiment

    Federicova, Pavla  

    The suppression of J/Psi production in heavy-ion collisions compared to p+p collisions, caused by the color screening in the deconfined medium, has been proposed as a signature of the formation of the Quark-Gluon Plasma. However, J/Psi production rates are also sensitive to other effects such as the cold nuclear matter effects and recombination. To understand the interplay of these mechanisms, it is important to study J/Psi production for different collision geometries. In these proceedings, we present recent result on J/Psi production via the di-electron decay channel from the STAR experiment at RHIC in p+p collisions at root s(NN) =3D 200, 500 GeV, in d+Au collisions at root s(NN) =3D 200 GeV and in heavy-ion collisions, specifically Au+Au collisions at root s(NN) =3D 200 GeV and U+U collisions at root s(NN) =3D 193 GeV. We also show measurements on J/Psi production via the di-muon decay channel in p+p collisions at root s(NN) =3D 500 GeV and in Au+Au collisions at root s(NN) =3D 200 GeV using the newly installed Muon Telescope Detector.
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  • A New Vision: J. J. Abrams, Star Trek, and Promotional Authorship

    Hadas, Leora  

    This article examines the use of authorship discourses in the promotion of media content through a case study of the 2009 Star Trek film, directed by J. J. Abrams. Analyzing press interviews and promotional paratexts, I focus on the potential conflict in which a franchise long associated with a distinct auteur figure was rebooted by a different creator, and the implications for marketing Star Trek to different audiences: new viewers and longtime fans. I demonstrate the careful management involved in the establishment of film authorship, and how the association with a particular author figure shapes the identity of a franchise.
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  • A New Vision: J. J. Abrams, Star Trek, and Promotional Authorship

    Hadas, Leora  

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  • Signed star (j, k)-domatic numbers of digraphs

    Sheikholeslami, S. M.; Volkmann, L.  

    Let D be a simple digraph with arc set A(D), and let j and k be two positive integers. A function f : A(D) -> {-1, 1} is said to be a signed star j-dominating function (SSjDF) on D if Sigma(a is an element of A(v)) f(a) >=3D j for every vertex v of D, where A(v) is the set of arcs with head v. A set {f(1), f(2),..., f(d)} of distinct SSjDFs on D with the property that Sigma(d)(i=3D1) f(i)(a) <=3D k for each a is an element of A(D), is called a signed star (j, k)-dominating (SS(j, k) D) family (of functions) on D. The maximum number of functions in a SS(j, k) D family on D is the signed star (j, k)-domatic number of D, denoted by d(SS)((j, k)) (D). In this paper, we study properties of the signed star (j, k)-domatic number of a digraph D. In particular, we determine bounds on d(SS)((j, k)) (D). Some of our results extend these ones given by Sheikholeslami and Volkmann [Signed star k-domination and k-domatic number of digraphs, submitted] for the signed (j, 1)-domatic number.
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  • Signed star (j, k)-domatic numbers of digraphs

    Sheikholeslami, S. M.   Volkmann, L.  

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  • J/psi-hadron correlations at STAR

    Kikola, Daniel  

    Despite over 30 years of theoretical studies of quarkonia production, the consistent description of J/psi production mechanism is still missing. At RHIC energies, the main difficulty is the separation of different contributions to the inclusive J/psi yield, which are direct production, feed-down from excited charmonium states and b-hadron decays. The information about production rates for these processes is also crucial to understand J/psi in-medium interaction which has been an active field of research for the last 20 years. In this article we discuss the recent results of J/psi-hadron correlation reported by the STAR collaboration. This measurement was used to constrain the contribution from b-hadron decays to inclusive J/psi yield at high transverse momentum. We also discuss prospects for using quarkonia hadron correlation to study quarkonia direct production.
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  • A SiO J=3D5 -> 4 Survey Toward Massive Star Formation Regions

    Li, Shanghuo   Wang, Junzhi   Fang, Min   Zhang, Qizhou   Li, Fei   Zhang, Zhi-Yu   Li, Juan   Zhu, Qingfeng   Zeng, Shaoshan  

    We performed a survey in the SiO J =3D 5 -> 4 line toward a sample of 199 Galactic massive star-forming regions at different evolutionary stages with the Submillimeter Telescope (SMT) 10 m and Caltech Submillimeter Observatory (CSO) 10.4 m telescopes. The sample consists of 44 infrared dark clouds (IRDCs), 86 protostellar candidates, and 69 young H IT regions. We detected SiO J =3D 5 -> 4 line emission in 102 sources, with a detection rate of 57%, 37%, and 65% for IRDCs, protostellar candidates, and young H IT regions, respectively. We find both broad line emissions with full widths at zero power >20 km s(-1) and narrow line emissions of SiO in objects at various evolutionary stages, likely associated with high-velocity shocks and low-velocity shocks, respectively. The SiO luminosities do not show apparent differences among various evolutionary stages in our sample. We find no correlation between the SiO abundance and the luminosity-to-mass ratio, indicating that the SiO abundance does not vary significantly in regions at different evolutionary stages of star formation.
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  • J/ψ-hadron correlations at STAR

    Daniel Kikoł  

    Despite over 30 years of theoretical studies of quarkonia production, the consistent description of J/ψ production mechanism is still missing. At RHIC energies, the main difficulty is the separation of different contributions to the inclusive J/ψ yield, which are direct production, feed-down from excited charmonium states and b-hadron decays. The information about production rates for these processes is also crucial to understand J/ψ in-medium interaction which has been an active field of research for the last 20 years.In this article we discuss the recent results of J/ψ-hadron correlation reported by the STAR collaboration. This measurement was used to constrain the contribution from b-hadron decays to inclusive J/ψ yield at high transverse momentum. We also discuss prospects for using quarkonia-hadron correlation to study quarkonia direct production.
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  • J/ψ-hadron correlations at STAR

    Daniel Kiko?a  

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  • Cover Feature: A Truncated Molecular Star (Chem. Eur. J. 51/2017)

    Prusty, Soumyakanta   Yazaki, Kohei   Yoshizawa, Michito   Chand, Dillip Kumar  

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  • J/ ψ production in proton+proton and heavy-ion collisions at STAR

    Yang   Yi  

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  • Cover Feature: A Truncated Molecular Star (Chem. Eur. J. 51/2017)

    Prusty, Soumyakanta; Yazaki, Kohei; Yoshizawa, Michito; Chand, Dillip Kumar  

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  • J/psi measurements in STAR Experiment at RHIC

    Hajkova, Olga  

    During the last decade STAR experiment has studied the hot and dense nuclear matter produced in heavy ion collisions at RHIC. The study of quarkonia, such as J/psi, meson, production provides the information about properties of this nuclear matter. It is predicted that due to the Debye screening the quarkonia production is suppressed when Quark Gluon Plasma (QGP) is presented. In order to understand the properties of hot and dense nuclear matter, it is necessary to study the production of quarkonia in hadron-hadron, hadron-ion, and ion-ion collisions separately to distinguish cold nuclear matter effect, such as gluon shadowing, from the suppression due to the formation of QGP. Moreover, the J/psi, hadron azimuthal correlations allow to extract the fraction of J/psi, that originates from B-mesons. This proceedings presents recent J/psi, measurements at mid-rapidity in p+p, and Au+Au collisions at root s(NN) = 200 GeV at STAR, the fraction of J/psi, originates from B-mesons, and J/psi, eliptic flow v(2) as a function of transverse momentum in Au+Au collisions in root s(NN) = 200 GeV at STAR.
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  • J/\r ψ\r production at the STAR experiment

    Federi?ová Pavla   Bondarenko S.   Burov V.   Malakhov A.  

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  • Review: Star Trek, directed by J. J. Abrams

    Paul-Choudhury   Sumit  

    Few franchises have inspired more people to become scientists than Star Trek, yet the show often focused on crowd-pleasing action and relegated science to expository technobabble. Does J. J. Abrams's new take on the series bring science centre stage?
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  • J/ψ and charm at STAR

    Chris Perkinsa   STAR Collaboration  

    Gluon saturation effects and Color Glass Condensate models become important at a scale . If the saturation scale can be raised to above the charm-quark mass, saturation effects can influence charm production and it is expected, based on CGC models, that charm particle production will follow similar patterns to those found in light quarks. This scale can potentially be reached in the charm sector by going to forward rapidities at RHIC and using nuclear “targets”.The large acceptance and pseudorapidity coverage (2.5<η<4) of the Forward Meson Spectrometer (FMS) at STAR provide excellent geometric efficiency to measure high-xF J/ψ production in p+p and d+Au collisions. A significant observation of high-xF J/ψ in p+p collisions has been obtained. Measurements of forward open charm production also look to be feasible based on initial simulation studies. By comparing d+Au measurements to p+p measurements in both charmonium and open charm productions, the FMS at STAR has the potential to test several predictions of CGC/Saturation models in the charm sector.
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