J. McIntyre - The Jefferson Lab Hall A Collaboration

J. McIntyre
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J. McIntyre
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The Jefferson Lab Hall A Collaboration
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Nuclear Experiment (10)
 
High Energy Physics - Experiment (4)
 
Physics - Instrumentation and Detectors (3)
 
Quantum Physics (2)
 
Physics - Mesoscopic Systems and Quantum Hall Effect (1)
 
Statistics - Methodology (1)
 
Quantitative Biology - Quantitative Methods (1)
 
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Publications Authored By J. McIntyre

2017Jan
Authors: GlueX Collaboration, H. Al Ghoul, E. G. Anassontzis, A. Austregesilo, F. Barbosa, A. Barnes, T. D. Beattie, D. W. Bennett, V. V. Berdnikov, T. Black, W. Boeglin, W. J. Briscoe, W. K. Brooks, B. E. Cannon, O. Chernyshov, E. Chudakov, V. Crede, M. M. Dalton, A. Deur, S. Dobbs, A. Dolgolenko, M. Dugger, R. Dzhygadlo, H. Egiyan, P. Eugenio, C. Fanelli, A. M. Foda, J. Frye, S. Furletov, L. Gan, A. Gasparian, A. Gerasimov, N. Gevorgyan, K. Goetzen, V. S. Goryachev, L. Guo, H. Hakobyan, J. Hardin, A. Henderson, G. M. Huber, D. G. Ireland, M. M. Ito, N. S. Jarvis, R. T. Jones, V. Kakoyan, M. Kamel, F. J. Klein, R. Kliemt, C. Kourkoumeli, S. Kuleshov, I. Kuznetsov, M. Lara, I. Larin, D. Lawrence, W. I. Levine, K. Livingston, G. J. Lolos, V. Lyubovitskij, D. Mack, P. T. Mattione, V. Matveev, M. McCaughan, M. McCracken, W. McGinley, J. McIntyre, R. Mendez, C. A. Meyer, R. Miskimen, R. E. Mitchell, F. Mokaya, K. Moriya, F. Nerling, G. Nigmatkulov, N. Ochoa, A. I. Ostrovidov, Z. Papandreou, M. Patsyuk, R. Pedroni, M. R. Pennington, L. Pentchev, K. J. Peters, E. Pooser, B. Pratt, Y. Qiang, J. Reinhold, B. G. Ritchie, L. Robison, D. Romanov, C. Salgado, R. A. Schumacher, C. Schwarz, J. Schwiening, A. Yu. Semenov, I. A. Semenova, K. K. Seth, M. R. Shepherd, E. S. Smith, D. I. Sober, A. Somov, S. Somov, O. Soto, N. Sparks, M. J. Staib, J. R. Stevens, I. I. Strakovsky, A. Subedi, V. Tarasov, S. Taylor, A. Teymurazyan, I. Tolstukhin, A. Tomaradze, A. Toro, A. Tsaris, G. Vasileiadis, I. Vega, N. K. Walford, D. Werthmuller, T. Whitlatch, M. Williams, E. Wolin, T. Xiao, J. Zarling, Z. Zhang, B. Zihlmann, V. Mathieu, J. Nys

We report measurements of the photon beam asymmetry $\Sigma$ for the reactions $\vec{\gamma}p\to p\pi^0$ and $\vec{\gamma}p\to p\eta $ from the GlueX experiment using a 9 GeV linearly-polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as a function of the proton momentum transfer, possess greater precision than previous $\pi^0$ measurements and are the first $\eta$ measurements in this energy regime. The results are compared with theoretical predictions based on $t$-channel, quasi-particle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models. Read More

Argon-37 is an environmental signature of an underground nuclear explosion. Producing and quantifying low-level Ar-37 standards is an important step in the development of sensitive field measurement instruments. This paper describes progress at Pacific Northwest National Laboratory in developing a process to generate and quantify low-level Ar-37 standards, which can be used to calibrate sensitive field systems at activities consistent with soil background levels. Read More

2015Dec

The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic and liquid hydrogen targets, and much of the detector has been commissioned. All of the detector systems are now performing at or near design specifications and events are being fully reconstructed, including exclusive production of $\pi^{0}$, $\eta$ and $\omega$ mesons. Read More

We propose to enhance the kaon identification capabilities of the GlueX detector by constructing an FDIRC (Focusing Detection of Internally Reflected Cherenkov) detector utilizing the decommissioned BaBar DIRC components. The GlueX FDIRC would significantly enhance the GlueX physics program by allowing one to search for and study hybrid mesons decaying into kaon final states. Such systematic studies of kaon final states are essential for inferring the quark flavor content of hybrid and conventional mesons. Read More

The primary motivation of the GlueX experiment is to search for and ultimately study the pattern of gluonic excitations in the meson spectrum produced in $\gamma p$ collisions. Recent lattice QCD calculations predict a rich spectrum of hybrid mesons that have both exotic and non-exotic $J^{PC}$, corresponding to $q\bar{q}$ states ($q=u,$ $d,$ or $s$) coupled with a gluonic field. A thorough study of the hybrid spectrum, including the identification of the isovector triplet, with charges 0 and $\pm1$, and both isoscalar members, $|s\bar{s}\ >$ and $|u\bar{u}\ > + |d\bar{d}\ >$, for each predicted hybrid combination of $J^{PC}$, may only be achieved by conducting a systematic amplitude analysis of many different hadronic final states. Read More

The primary motivation of the GlueX experiment is to search for and ultimately study the pattern of gluonic excitations in the meson spectrum produced in gamma p collisions. Recent lattice QCD calculations predict a rich spectrum of hybrid mesons that have both exotic and non-exotic JPC, corresponding to q q-bar (q=u, d, or s) states coupled with a gluonic field. A thorough study of the hybrid spectrum, including the identification of the isovector triplet, with charges 0 and +-1, and both isoscalar members, |s s-bar> and |u u-bar> + |d d-bar>, for each predicted hybrid combination of JPC, may only be achieved by conducting a systematic amplitude analysis of many different hadronic final states. Read More

2012May
Authors: H. Fonvieille1, G. Laveissiere2, N. Degrande3, S. Jaminion4, C. Jutier5, L. Todor6, R. Di Salvo7, L. Van Hoorebeke8, L. C. Alexa9, B. D. Anderson10, K. A. Aniol11, K. Arundell12, G. Audit13, L. Auerbach14, F. T. Baker15, M. Baylac16, J. Berthot17, P. Y. Bertin18, W. Bertozzi19, L. Bimbot20, W. U. Boeglin21, E. J. Brash22, V. Breton23, H. Breuer24, E. Burtin25, J. R. Calarco26, L. S. Cardman27, C. Cavata28, C. -C. Chang29, J. -P. Chen30, E. Chudakov31, E. Cisbani32, D. S. Dale33, C. W. deJager34, R. De Leo35, A. Deur36, N. d'Hose37, G. E. Dodge38, J. J. Domingo39, L. Elouadrhiri40, M. B. Epstein41, L. A. Ewell42, J. M. Finn43, K. G. Fissum44, G. Fournier45, B. Frois46, S. Frullani47, C. Furget48, H. Gao49, J. Gao50, F. Garibaldi51, A. Gasparian52, S. Gilad53, R. Gilman54, A. Glamazdin55, C. Glashausser56, J. Gomez57, V. Gorbenko58, P. Grenier59, P. A. M. Guichon60, J. O. Hansen61, R. Holmes62, M. Holtrop63, C. Howell64, G. M. Huber65, C. E. Hyde66, S. Incerti67, M. Iodice68, J. Jardillier69, M. K. Jones70, W. Kahl71, S. Kato72, A. T. Katramatou73, J. J. Kelly74, S. Kerhoas75, A. Ketikyan76, M. Khayat77, K. Kino78, S. Kox79, L. H. Kramer80, K. S. Kumar81, G. Kumbartzki82, M. Kuss83, A. Leone84, J. J. LeRose85, M. Liang86, R. A. Lindgren87, N. Liyanage88, G. J. Lolos89, R. W. Lourie90, R. Madey91, K. Maeda92, S. Malov93, D. M. Manley94, C. Marchand95, D. Marchand96, D. J. Margaziotis97, P. Markowitz98, J. Marroncle99, J. Martino100, K. McCormick101, J. McIntyre102, S. Mehrabyan103, F. Merchez104, Z. E. Meziani105, R. Michaels106, G. W. Miller107, J. Y. Mougey108, S. K. Nanda109, D. Neyret110, E. A. J. M. Offermann111, Z. Papandreou112, B. Pasquini113, C. F. Perdrisat114, R. Perrino115, G. G. Petratos116, S. Platchkov117, R. Pomatsalyuk118, D. L. Prout119, V. A. Punjabi120, T. Pussieux121, G. Quemener122, R. D. Ransome123, O. Ravel124, J. S. Real125, F. Renard126, Y. Roblin127, D. Rowntree128, G. Rutledge129, P. M. Rutt130, A. Saha131, T. Saito132, A. J. Sarty133, A. Serdarevic134, T. Smith135, G. Smirnov136, K. Soldi137, P. Sorokin138, P. A. Souder139, R. Suleiman140, J. A. Templon141, T. Terasawa142, R. Tieulent143, E. Tomasi-Gustaffson144, H. Tsubota145, H. Ueno146, P. E. Ulmer147, G. M. Urciuoli148, M. Vanderhaeghen149, R. L. J. Van der Meer150, R. Van De Vyver151, P. Vernin152, B. Vlahovic153, H. Voskanyan154, E. Voutier155, J. W. Watson156, L. B. Weinstein157, K. Wijesooriya158, R. Wilson159, B. B. Wojtsekhowski160, D. G. Zainea161, W. -M. Zhang162, J. Zhao163, Z. -L. Zhou164
Affiliations: 1The Jefferson Lab Hall A Collaboration, 2The Jefferson Lab Hall A Collaboration, 3The Jefferson Lab Hall A Collaboration, 4The Jefferson Lab Hall A Collaboration, 5The Jefferson Lab Hall A Collaboration, 6The Jefferson Lab Hall A Collaboration, 7The Jefferson Lab Hall A Collaboration, 8The Jefferson Lab Hall A Collaboration, 9The Jefferson Lab Hall A Collaboration, 10The Jefferson Lab Hall A Collaboration, 11The Jefferson Lab Hall A Collaboration, 12The Jefferson Lab Hall A Collaboration, 13The Jefferson Lab Hall A Collaboration, 14The Jefferson Lab Hall A Collaboration, 15The Jefferson Lab Hall A Collaboration, 16The Jefferson Lab Hall A Collaboration, 17The Jefferson Lab Hall A Collaboration, 18The Jefferson Lab Hall A Collaboration, 19The Jefferson Lab Hall A Collaboration, 20The Jefferson Lab Hall A Collaboration, 21The Jefferson Lab Hall A Collaboration, 22The Jefferson Lab Hall A Collaboration, 23The Jefferson Lab Hall A Collaboration, 24The Jefferson Lab Hall A 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Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detailed account of the analysis which has led to the determination of the structure functions P_LL-P_TT/epsilon and P_LT, and the electric and magnetic generalized polarizabilities (GPs) alpha_E(Q^2) and beta_M(Q^2) at values of the four-momentum transfer squared Q^2= 0.92 and 1. Read More

Density estimates based on point processes are often restrained to regions with irregular boundaries or holes. We propose a density estimator, the lattice-based density estimator, which produces reasonable density estimates under these circumstances. The estimation process starts with overlaying the region with nodes, linking these together in a lattice and then computing the density of random walks of length k on the lattice. Read More

Magnetic resonance techniques provide a powerful tool for controlling spin systems, with applications ranging from quantum information processing to medical imaging. Nevertheless, the behavior of a spin system under strong excitation remains a rich dynamical problem. In this paper, we examine spin resonance of the nitrogen-vacancy center in diamond under conditions outside the regime where the usual rotating wave approximation applies, focusing on effects of multifrequency excitation and excitation with orientation parallel to the spin quantization axis. Read More

Isolated nuclear spins offer a promising building block for quantum information processing systems, but their weak interactions often impede preparation, control, and detection. Hyperfine coupling to a proximal electronic spin can enhance each of these processes. Using the electronic spin of the nitrogen-vacancy center as an intermediary, we demonstrate robust initialization, single-qubit manipulation, and direct optical readout of 13C, 15N, and 14N nuclear spins in diamond. Read More

For experiments of the type A(\vec e,e'\vec p) the 3-spectrometer setup of the A1 collaboration at MAMI has been supplemented by a focal plane proton-polarimeter. To this end, a carbon analyzer of variable thickness and two double-planes of horizontal drift chambers have been added to the standard detector system of Spectrometer A. Due to the spin precession in the spectrometer magnets, all three polarization components at the target can be measured simultaneously. Read More

The first measurements of the induced proton polarization, P_n, for the 12C (e,e'\vec{p}) reaction are reported. The experiment was performed at quasifree kinematics for energy and momentum transfer (\omega,q) \approx (294 MeV, 756 MeV/c) and sampled a recoil momentum range of 0-250 MeV/c. The induced polarization arises from final-state interactions and for these kinematics is dominated by the real part of the spin-orbit optical potential. Read More