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Your search keyword '"Morris C.L."' showing total 5 results
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5 results on '"Morris C.L."'

1. Search for neutron dark decay: n $\rightarrow \chi + e^+e^-$

Author

Sun, X., Adamek, E., Allgeier, B., Blatnik, M., Bowles, T.J., Broussard, L.J., Brown, M.A.P., Carr, R., Clayton, S., Cude-Woods, C., Currie, S., Dees, E.B., Ding, X., Filippone, B.W., GarcÍa, A., Geltenbort, P., Hasan, S., Hickerson, K.P., Hoagland, J., Hong, R., Hogan, G.E., Holley, A.T., Ito, T.M., Kneckt, A., Liu, C.Y., Liu, J., Makela, M., Mammei, R., Martin, J.W., Melconian, D., Mendenhall, M.P., Moore, S.D., Morris, C.L., Nepal, S., Nouri, N., Pattie, R.W., Galván, A.P., II, D.G.Phillips, Picker, R., Pitt, M.L., Plaster, B., Ramsey, J.C., Rios, R., Salvat, D.J., Saunders, A., Sondheim, W., Sjue, S., Slutsky, S., Swank, C., Swift, G., Tatar, E., Vogelaar, R.B., Vorndick, B., Wanchun, W., Wang, Z., Wexler, J., Womack, T., Wrede, C., Young, A.R., Zeck, B.A., Institut Laue-Langevin (ILL), and ILL

Subjects
energy: kinetic, branching ratio: upper limit, n: decay, n: branching ratio, talk: Grenoble 2018/05/24, calibration, dark matter, mass dependence, electron: pair production, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, n: lifetime, acceptance, experimental results
Abstract

International audience; In January, 2018, Fornal and Grinstein proposed that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in two different types of experiments. One of the possible final states discussed includes a single χ along with an e+e− pair. We use data from the UCNA (Ultracold Neutron Asymmetry) experiment to set limits on this decay channel. Coincident electron-like events are detected with ∼ 4π acceptance using a pair of detectors that observe a volume of stored Ultracold Neutrons (UCNs). We use the timing information of coincidence events to select candidate dark sector particle decays by applying a timing calibration and selecting events within a physically-forbidden timing region for conventional n → p + e- + ν̅e decays. The summed kinetic energy (Ee+e−) from such events is reconstructed and used to set limits, as a function of the χ mass, on the branching fraction for this decay channel.

Published
2018
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2. Search for the Neutron Decay n$\rightarrow$ X+$\gamma$ where X is a dark matter particle

Author

Tang, Z., Blatnik, M., Broussard, L.J., Choi, J.H., Clayton, S.M., Cude-Woods, C., Currie, S., Fellers, D.E., Fries, E.M., Geltenbort, P., Gonzalez, F., Ito, T.M., Liu, C.Y., MacDonald, S.W.T., Makela, M., Morris, C.L., O'Shaughnessy, C.M., Pattie, R.W., Plaster, B., Salvat, D.J., Saunders, A., Wang, Z., Young, A.R., Zeck, B.A., Institut Laue-Langevin ( ILL ), ILL, and Institut Laue-Langevin (ILL)

Subjects
Automatic Keywords, gamma ray, dark matter: decay modes, n: decay, High Energy Physics::Experiment, n: lifetime, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

In a recent paper submitted to Physical Review Letters, Fornal and Grinstein have suggested that the discrepancy between two different methods of neutron lifetime measurements, the beam and bottle methods can be explained by a previously unobserved dark matter decay mode, n$\rightarrow$ X+$\gamma$ where X is a dark matter particle. We have performed a search for this decay mode over the allowed range of energies of the monoenergetic gamma ray for X to be a dark matter particle. We exclude the possibility of a sufficiently strong branch to explain the lifetime discrepancy with greater than 4 sigma confidence., Comment: 6 pages 3 figures

Published
2018
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3. New result for the neutron $\beta$-asymmetry parameter $A_0$ from UCNA

Author

Brown, M.A.-P., Dees, E.B., Adamek, E., Allgeier, B., Blatnik, M., Bowles, T.J., Broussard, L.J., Carr, R., Clayton, S., Cude-Woods, C., Currie, S., Ding, X., Filippone, B.W., GarcÍa, A., Geltenbort, P., Hasan, S., Hickerson, K.P., Hoagland, J., Hong, R., Hogan, G.E., Holley, A.T., Ito, T.M., Knecht, A., Liu, C.-Y., Liu, J., Makela, M., Martin, J.W., Melconian, D., Mendenhall, M.P., Moore, S.D., Morris, C.L., Nepal, S., Nouri, N., Pattie, R.W., Pérez Galván, A., Phillips, D.G., Picker, R., Pitt, M.L., Plaster, B., Ramsey, J.C., Rios, R., Salvat, D.J., Saunders, A., Sondheim, W., Seestrom, S.J., Sjue, S., Slutsky, S., Sun, X., Swank, C., Swift, G., Tatar, E., Vogelaar, R.B., Vorndick, B., Wang, Z., Wexler, J., Womack, T., Wrede, C., Young, A.R., Zeck, B.A., Institut Laue-Langevin (ILL), ILL, UCNA, and Institut Laue-Langevin ( ILL )

Subjects
electron, axial-vector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], weak coupling, Automatic Keywords, statistics, S017AV, correlation, High Energy Physics::Experiment, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, n: spin, S017BA, asymmetry, experimental results
Abstract

The neutron $\beta$-decay asymmetry parameter $A_0$ defines the correlation between the spin of the neutron and the momentum of the emitted electron, which determines $\lambda=\frac{g_{A}}{g_{V}}$, the ratio of the axial-vector to vector weak coupling constants. The UCNA Experiment, located at the Ultracold Neutron facility at the Los Alamos Neutron Science Center, is the first to measure such a correlation coefficient using ultracold neutrons (UCN). Following improvements to the systematic uncertainties and increased statistics, we report the new result $A_0 = -0.12054(44)_{\mathrm{stat}}(68)_{\mathrm{syst}}$ which yields $\lambda\equiv \frac{g_{A}}{g_{V}}=-1.2783(22)$. Combination with the previous UCNA result and accounting for correlated systematic uncertainties produces $A_0=-0.12015(34)_{\mathrm{stat}}(63)_{\mathrm{syst}}$ and $\lambda\equiv \frac{g_{A}}{g_{V}}=-1.2772(20)$., Comment: 9 pages, 7 figures, updated to as-published version

Published
2018
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4. First direct constraints on Fierz interference in free neutron $\beta$ decay

Author

Hickerson, K.P., Sun, X., Bagdasarova, Y., Bravo-Berguño, D., Broussard, L.J., Brown, P., Carr, R., Currie, S., Ding, X., Filippone, B.W., GarcÍa, A., Geltenbort, P., Hoagland, J., Holley, A.T., Hong, R., Ito, T.M., Knecht, A., Liu, C.-Y, Liu, J.L., Makela, M., Mammei, R.R., Martin, J.W., Melconian, D., Mendenhall, M.P., Moore, § S.D., Morris, C.L., Pattie, R.W., Pérez Galván, A., Picker, R., Pitt, M.L., Plaster, B., Ramsey, J.C., Rios, R., Saunders, A., Seestrom, S.J., Sharapov, E.I., Sondheim, W.E., Tatar, E., Vogelaar, R.B., Vorndick, B., Wrede, C., Young, A.R., Zeck, B.A., Institut Laue-Langevin (ILL), ILL, and Institut Laue-Langevin ( ILL )

Subjects
Particle physics, scale: TeV, Astrophysics::High Energy Astrophysical Phenomena, interference, n: decay, Weak interaction, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Interference (wave propagation), 01 natural sciences, Standard Model, Nuclear physics, weak interaction, statistical analysis, 0103 physical sciences, Fierz-Pauli equation, Neutron, Tensor, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, Monte Carlo, Physics, Spectrometer, 010308 nuclear & particles physics, precision measurement, new physics, n: decay rate, Electroweak interaction, semileptonic decay, coupling: tensor, Beta decay, High Energy Physics::Experiment, spectrometer, experimental results
Abstract

Precision measurements of free neutron $\beta$-decay have been used to precisely constrain our understanding of the weak interaction. However the neutron Fierz interference term $b_n$, which is particularly sensitive to Beyond-Standard-Model tensor currents at the TeV scale, has thus far eluded measurement. Here we report the first direct constraints on this term, finding $b_n = 0.067 \pm 0.005_{\text{stat}} {}^{+0.090}_{- 0.061}{}_{\text{sys}}$, consistent with the Standard Model. The uncertainty is dominated by absolute energy reconstruction and the linearity of the beta spectrometer energy response.

Published
2017
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5. Exclusive Compton Scattering on the Proton

Author

Chen, J.P., Chudakov, E., DeJager, C., Degtyarenko, P., Ent, R., Gomez, J., Hansen, O., Keppel, C., Klein, F., Kuss, M., LeRose, J., Liang, M., Michaels, R., Mitchell, J., Liyanage, N., Rutt, P., Saha, A., Wojtsekhowski, B., Bouwhuis, M., Chang, T.H., Holt, R.J., Nathan, A.M., Roedelbronn, M., Wijesooriya, K., Williamson, S.E., Dodge, G., Hyde-Wright, C., Radyushkin, A., Sabatie, F., Weinstein, L.B., Ulmer, P., Bosted, P.E., Finn, J.M., Jones, M., Churchwell, S., Howell, C., Gilman, R., Glashausser, C., Jiang, X., Ransome, R., Strauch, S., Berthot, J., Bertin, P.Y., Fonvieille, H., Roblin, Y., Bertozzi, W., Gilad, S., Rowntree, D., Zu, Z., Brown, D., Chang, G., Afanasev, A., Egiyan, K., Hoohauneysan, E., Ketikyan, A., Petrosyan, Artem, Shahinyan, A., Voskanyan, H., Boeglin, W., Markowitz, P., Hines, J., Strobel, G., Templon, J., Feldman, G., Morris, C.L., Gladyshev, V., Lindgren, R.A., Calarco, J., Hersman, W., Leuschner, M., Gasparian, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and HALL A

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

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