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1. Measurement of the high-energy gamma-ray emission from the Moon with the Fermi Large Area Telescope

Author

Ackermann, M, Ajello, M, Albert, A, Atwood, WB, Baldini, L, Barbiellini, G, Bastieri, D, Bellazzini, R, Bissaldi, E, Blandford, RD, Bonino, R, Bottacini, E, Bregeon, J, Bruel, P, Buehler, R, Caliandro, GA, Cameron, RA, Caragiulo, M, Caraveo, PA, Cavazzuti, E, Cecchi, C, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Costanza, F, Cuoco, A, Cutini, S, D’Ammando, F, de Angelis, A, de Palma, F, Desiante, R, Digel, SW, Di Venere, L, Drell, PS, Favuzzi, C, Fegan, SJ, Focke, WB, Franckowiak, A, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Grove, JE, Guiriec, S, Harding, AK, Hewitt, JW, Horan, D, Hou, X, Iafrate, G, Jóhannesson, G, Kamae, T, Kuss, M, Larsson, S, Latronico, L, Li, J, Li, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Magill, J, Maldera, S, Manfreda, A, Mayer, M, Mazziotta, MN, Michelson, PF, Mitthumsiri, W, Mizuno, T, Monzani, ME, Morselli, A, Murgia, S, Nuss, E, Omodei, N, Orlando, E, Ormes, JF, Paneque, D, Perkins, JS, Pesce-Rollins, M, Petrosian, V, Piron, F, Pivato, G, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Sgrò, C, Siskind, EJ, Spada, F, and Spandre, G

Subjects
Fermi LAT Collaboration, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have measured the gamma-ray emission spectrum of the Moon using the data collected by the Large Area Telescope onboard the Fermi satellite during its first seven years of operation, in the energy range from 30 MeV up to a few GeV. We have also studied the time evolution of the flux, finding a correlation with the solar activity. We have developed a full Monte Carlo simulation describing the interactions of cosmic rays with the lunar surface. The results of the present analysis can be explained in the framework of this model, where the production of gamma rays is due to the interactions of cosmic-ray proton and helium nuclei with the surface of the Moon. Finally, we have used our simulation to derive the cosmic-ray proton and helium spectra near Earth from the Moon gamma-ray data.

Published
2016

2. SEARCH FOR EXTENDED GAMMA-RAY EMISSION FROM THE VIRGO GALAXY CLUSTER WITH FERMI-LAT

Author

Ackermann, M, Ajello, M, Albert, A, Atwood, WB, Baldini, L, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Bissaldi, E, Bloom, ED, Bonino, R, Bottacini, E, Brandt, TJ, Bregeon, J, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caputo, R, Caragiulo, M, Caraveo, PA, Casandjian, JM, Cavazzuti, E, Cecchi, C, Charles, E, Chekhtman, A, Chiaro, G, Ciprini, S, Cohen-Tanugi, J, Conrad, J, Cutini, S, D’Ammando, F, de Angelis, A, de Palma, F, Desiante, R, Digel, SW, Di Venere, L, Drell, PS, Favuzzi, C, Fegan, SJ, Focke, WB, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Gomez-Vargas, GA, Grenier, IA, Guiriec, S, Gustafsson, M, Hewitt, JW, Hill, AB, Horan, D, Jeltema, TE, Jogler, T, Johnson, AS, Kuss, M, Larsson, S, Latronico, L, Li, J, Li, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Maldera, S, Malyshev, D, Manfreda, A, Mayer, M, Mazziotta, MN, Michelson, PF, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nuss, E, Ohsugi, T, Orienti, M, Orlando, E, Ormes, JF, Paneque, D, Perkins, JS, Pesce-Rollins, M, Petrosian, V, Piron, F, Pivato, G, Porter, TA, Rainó, S, Rando, R, Razzano, M, and Reimer, A

Subjects
galaxies: clusters: individual, gamma-rays: galaxies: clusters, gamma-rays: general, astro-ph.HE, hep-ph, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics
Abstract

Galaxy clusters are one of the prime sites to search for dark matter (DM) annihilation signals. Depending on the substructure of the DM halo of a galaxy cluster and the cross sections for DM annihilation channels, these signals might be detectable by the latest generation of γ-ray telescopes. Here we use three years of Fermi-Large Area Telescope data, which are the most suitable for searching for very extended emission in the vicinity of the nearby Virgo galaxy cluster. Our analysis reveals statistically significant extended emission which can be well characterized by a uniformly emitting disk profile with a radius of 3 that moreover is offset from the cluster center. We demonstrate that the significance of this extended emission strongly depends on the adopted interstellar emission model (IEM) and is most likely an artifact of our incomplete description of the IEM in this region. We also search for and find new point source candidates in the region. We then derive conservative upper limits on the velocity-averaged DM pair annihilation cross section from Virgo. We take into account the potential γ-ray flux enhancement due to DM sub-halos and its complex morphology as a merging cluster. For DM annihilating into assuming a conservative sub-halo model setup, we find limits that are between 1 and 1.5 orders of magnitude above the expectation from the thermal cross section for mDM ≲ 100 GeV. In a more optimistic scenario, we exclude for mDM ≲ 40 GeV for the same channel. Finally, we derive upper limits on the γ-ray-flux produced by hadronic cosmic-ray interactions in the inter cluster medium. We find that the volume-averaged cosmic-ray-to-thermal pressure ratio is less than ∼6%.

Published
2015

3. SEARCH FOR EARLY GAMMA-RAY PRODUCTION IN SUPERNOVAE LOCATED IN A DENSE CIRCUMSTELLAR MEDIUM WITH THE FERMI LAT

Author

Ackermann, M, Arcavi, I, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bellazzini, R, Bissaldi, E, Blandford, RD, Bonino, R, Bottacini, E, Brandt, TJ, Bregeon, J, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caragiulo, M, Caraveo, PA, Cavazzuti, E, Cecchi, C, Charles, E, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Cutini, S, D’Ammando, F, de Angelis, A, de Palma, F, Desiante, R, Di Venere, L, Drell, PS, Favuzzi, C, Fegan, SJ, Franckowiak, A, Funk, S, Fusco, P, Gal-Yam, A, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Grove, JE, Guiriec, S, Harding, AK, Hayashi, K, Hewitt, JW, Hill, AB, Horan, D, Jogler, T, Jóhannesson, G, Kocevski, D, Kuss, M, Larsson, S, Lashner, J, Latronico, L, Li, J, Li, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Malyshev, D, Mayer, M, Mazziotta, MN, McEnery, JE, Michelson, PF, Mizuno, T, Monzani, ME, Morselli, A, Murase, K, Nugent, P, Nuss, E, Ofek, E, Ohsugi, T, Orienti, M, Orlando, E, Ormes, JF, Paneque, D, Pesce-Rollins, M, Piron, F, Pivato, G, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Schulz, A, Sgrò, C, Siskind, EJ, Spada, F, and Spandre, G

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, cosmic rays, gamma rays: general, methods: data analysis, supernovae: general, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract

Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV γ-rays and TeV neutrinos on a timescale of several months. We perform the first systematic search for γ-ray emission in Fermi Large Area Telescope data in the energy range from to from the ensemble of 147 SNe Type IIn exploding in a dense CSM. We search for a γ-ray excess at each SNe location in a one-year time window. In order to enhance a possible weak signal, we simultaneously study the closest and optically brightest sources of our sample in a joint-likelihood analysis in three different time windows (1 year, 6 months, and 3 months). For the most promising source of the sample, SN 2010jl (PTF 10aaxf), we repeat the analysis with an extended time window lasting 4.5 years. We do not find a significant excess in γ-rays for any individual source nor for the combined sources and provide model-independent flux upper limits for both cases. In addition, we derive limits on the γ-ray luminosity and the ratio of γ-ray-to-optical luminosity ratio as a function of the index of the proton injection spectrum assuming a generic γ-ray production model. Furthermore, we present detailed flux predictions based on multi-wavelength observations and the corresponding flux upper limit at a 95% confidence level (CL) for the source SN 2010jl (PTF 10aaxf).

Published
2015

4. FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG

Author

Acero, F, Ackermann, M, Ajello, M, Albert, A, Atwood, WB, Axelsson, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Belfiore, A, Bellazzini, R, Bissaldi, E, Blandford, RD, Bloom, ED, Bogart, JR, Bonino, R, Bottacini, E, Bregeon, J, Britto, RJ, Bruel, P, Buehler, R, Burnett, TH, Buson, S, Caliandro, GA, Cameron, RA, Caputo, R, Caragiulo, M, Caraveo, PA, Casandjian, JM, Cavazzuti, E, Charles, E, Chaves, RCG, Chekhtman, A, Cheung, CC, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Tanugi, J Cohen-, Cominsky, LR, Conrad, J, Cutini, S, D’Ammando, F, de Angelis, A, DeKlotz, M, de Palma, F, Desiante, R, Digel, SW, Di Venere, L, Drell, PS, Dubois, R, Dumora, D, Favuzzi, C, Fegan, SJ, Ferrara, EC, Finke, J, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giebels, B, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Grondin, M-H, Grove, JE, Guillemot, L, Guiriec, S, Hadasch, D, Harding, AK, Hays, E, Hewitt, JW, Hill, AB, Horan, D, Iafrate, G, Jogler, T, Jóhannesson, G, Johnson, RP, Johnson, AS, Johnson, TJ, Johnson, WN, Kamae, T, Kataoka, J, Katsuta, J, Kuss, M, La Mura, G, Landriu, D, Larsson, S, Latronico, L, Goumard, M Lemoine-, Li, J, Li, L, and Longo, F

Subjects
catalogs, gamma-rays: general, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics
Abstract

We present the third Fermi Large Area Telescope (LAT) source catalog (3FGL) of sources in the 100 MeV-300 GeV range. Based on the first 4 yr of science data from the Fermi Gamma-ray Space Telescope mission, it is the deepest yet in this energy range. Relative to the Second Fermi LAT catalog, the 3FGL catalog incorporates twice as much data, as well as a number of analysis improvements, including improved calibrations at the event reconstruction level, an updated model for Galactic diffuse γ-ray emission, a refined procedure for source detection, and improved methods for associating LAT sources with potential counterparts at other wavelengths. The 3FGL catalog includes 3033 sources above significance, with source location regions, spectral properties, and monthly light curves for each. Of these, 78 are flagged as potentially being due to imperfections in the model for Galactic diffuse emission. Twenty-five sources are modeled explicitly as spatially extended, and overall 238 sources are considered as identified based on angular extent or correlated variability (periodic or otherwise) observed at other wavelengths. For 1010 sources we have not found plausible counterparts at other wavelengths. More than 1100 of the identified or associated sources are active galaxies of the blazar class; several other classes of non-blazar active galaxies are also represented in the 3FGL. Pulsars represent the largest Galactic source class. From source counts of Galactic sources we estimate that the contribution of unresolved sources to the Galactic diffuse emission is ∼3% at 1 GeV.

Published
2015

5. Updated search for spectral lines from Galactic dark matter interactions with pass 8 data from the Fermi Large Area Telescope

Author

Ackermann, M, Ajello, M, Albert, A, Anderson, B, Atwood, WB, Baldini, L, Barbiellini, G, Bastieri, D, Bellazzini, R, Bissaldi, E, Blandford, RD, Bloom, ED, Bonino, R, Bottacini, E, Brandt, TJ, Bregeon, J, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caputo, R, Caragiulo, M, Caraveo, PA, Cecchi, C, Charles, E, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Cuoco, A, Cutini, S, D'Ammando, F, De Angelis, A, De Palma, F, Desiante, R, Digel, SW, Di Venere, L, Drell, PS, Drlica-Wagner, A, Favuzzi, C, Fegan, SJ, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Godfrey, G, Gomez-Vargas, GA, Grenier, IA, Grove, JE, Guiriec, S, Gustafsson, M, Hewitt, JW, Hill, AB, Horan, D, Jóhannesson, G, Johnson, RP, Kuss, M, Larsson, S, Latronico, L, Li, J, Li, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Malyshev, D, Mayer, M, Mazziotta, MN, McEnery, JE, Michelson, PF, Mizuno, T, Moiseev, AA, Monzani, ME, Morselli, A, Murgia, S, Nuss, E, Ohsugi, T, Orienti, M, Orlando, E, Ormes, JF, Paneque, D, Pesce-Rollins, M, Piron, F, Pivato, G, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reposeur, T, Ritz, S, and Sánchez-Conde, M

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Dark matter in the Milky Way may annihilate directly into γ rays, producing a monoenergetic spectral line. Therefore, detecting such a signature would be strong evidence for dark matter annihilation or decay. We search for spectral lines in the Fermi Large Area Telescope observations of the Milky Way halo in the energy range 200 MeV-500 GeV using analysis methods from our most recent line searches. The main improvements relative to previous works are our use of 5.8 years of data reprocessed with the Pass 8 event-level analysis and the additional data resulting from the modified observing strategy designed to increase exposure of the Galactic center region. We search in five sky regions selected to optimize sensitivity to different theoretically motivated dark matter scenarios and find no significant detections. In addition to presenting the results from our search for lines, we also investigate the previously reported tentative detection of a line at 133 GeV using the new Pass 8 data.

Published
2015

6. SEARCH FOR COSMIC-RAY-INDUCED GAMMA-RAY EMISSION IN GALAXY CLUSTERS

Author

Ackermann, M, Ajello, M, Albert, A, Allafort, A, Atwood, WB, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Bloom, ED, Bonamente, E, Bottacini, E, Brandt, TJ, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Cavazzuti, E, Chaves, RCG, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, D'Ammando, F, de Angelis, A, de Palma, F, Dermer, CD, Digel, SW, Drell, PS, Drlica-Wagner, A, Favuzzi, C, Franckowiak, A, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Godfrey, G, Gomez-Vargas, GA, Grenier, IA, Guiriec, S, Gustafsson, M, Hadasch, D, Hayashida, M, Hewitt, J, Hughes, RE, Jeltema, TE, Jóhannesson, G, Johnson, AS, Kamae, T, Kataoka, J, Knödlseder, J, Kuss, M, Lande, J, Larsson, S, Latronico, L, Garde, M Llena, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Mayer, M, Mazziotta, MN, McEnery, JE, Michelson, PF, Mitthumsiri, W, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nemmen, R, Nuss, E, Ohsugi, T, Orienti, M, Orlando, E, Ormes, JF, Perkins, JS, Pesce-Rollins, M, Piron, F, Pivato, G, Rainò, S, Rando, R, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Ruan, J, and Sánchez-Conde, M

Subjects
galaxies: clusters: intracluster medium, gamma rays: galaxies: clusters, astro-ph.HE, astro-ph.CO, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics
Abstract

Current theories predict relativistic hadronic particle populations in clusters of galaxies in addition to the already observed relativistic leptons. In these scenarios hadronic interactions give rise to neutral pions which decay into γ rays that are potentially observable with the Large Area Telescope (LAT) on board the Fermi space telescope. We present a joint likelihood analysis searching for spatially extended γ-ray emission at the locations of 50 galaxy clusters in four years of Fermi-LAT data under the assumption of the universal cosmic-ray (CR) model proposed by Pinzke & Pfrommer. We find an excess at a significance of 2.7σ, which upon closer inspection, however, is correlated to individual excess emission toward three galaxy clusters: A400, A1367, and A3112. We discuss these cases in detail and conservatively attribute the emission to unmodeled background systems (for example, radio galaxies within the clusters).Through the combined analysis of 50 clusters, we exclude hadronic injection efficiencies in simple hadronic models above 21% and establish limits on the CR to thermal pressure ratio within the virial radius, R 200, to be below 1.25%-1.4% depending on the morphological classification. In addition, we derive new limits on the γ-ray flux from individual clusters in our sample. © 2014. The American Astronomical Society. All rights reserved.

Published
2014

7. MULTIFREQUENCY STUDIES OF THE PECULIAR QUASAR 4C +21.35 DURING THE 2010 FLARING ACTIVITY

Author

Ackermann, M, Ajello, M, Allafort, A, Antolini, E, Barbiellini, G, Bastieri, D, Bellazzini, R, Bissaldi, E, Bonamente, E, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Cavazzuti, E, Cecchi, C, Chaves, RCG, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Cutini, S, D'Ammando, F, de Palma, F, Dermer, CD, do Couto e Silva, E, Donato, D, Drell, PS, Favuzzi, C, Finke, J, Focke, WB, Franckowiak, A, Fukazawa, Y, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Giglietto, N, Giordano, F, Giroletti, M, Godfrey, G, Grenier, IA, Guiriec, S, Hayashida, M, Hewitt, JW, Horan, D, Hughes, RE, Iafrate, G, Johnson, AS, Knödlseder, J, Kuss, M, Lande, J, Larsson, S, Latronico, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Mayer, M, Mazziotta, MN, McEnery, JE, Michelson, PF, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nemmen, R, Nuss, E, Ohsugi, T, Orienti, M, Orlando, E, Perkins, JS, Pesce-Rollins, M, Piron, F, Pivato, G, Porter, TA, Rainò, S, Razzano, M, Reimer, A, Reimer, O, Sanchez, DA, Schulz, A, Sgrò, C, Siskind, EJ, Spandre, G, Spinelli, P, Stawarz, Ł, Takahashi, H, Takahashi, T, Thayer, JG, Thayer, JB, Thompson, DJ, and Tinivella, M

Subjects
galaxies: active, gamma rays: general, quasars: general, quasars: individual, radiation mechanisms: non-thermal, astro-ph.HE, astro-ph.CO, astro-ph.GA, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics
Abstract

The discovery of rapidly variable Very High Energy (VHE; E > 100 GeV) γ -ray emission from 4C +21.35 (PKS 1222+216) by MAGIC on 2010 June 17, triggered by the high activity detected by the Fermi Large Area Telescope (LAT) in high energy (HE;E >100 MeV) γ -rays, poses intriguing questions on the location of the γ -ray emitting region in this flat spectrum radio quasar. We present multifrequency data of 4C +21.35 collected from centimeter to VHE during 2010 to investigate the properties of this source and discuss a possible emission model. The first hint of detection at VHE was observed by MAGIC on 2010 May 3, soon after a γ -ray flare detected by Fermi-LAT that peaked on April 29. The same emission mechanism may therefore be responsible for both the HE and VHE emission during the 2010 flaring episodes. Two optical peaks were detected on 2010 April 20 and June 30, close in time but not simultaneous with the two γ -ray peaks, while no clear connection was observed between the X-ray and γ -ray emission. An increasing flux density was observed in radio and mm bands from the beginning of 2009, in accordance with the increasing γ -ray activity observed by Fermi-LAT, and peaking on 2011 January 27 in the mm regime (230 GHz). We model the spectral energy distributions (SEDs) of 4C +21.35 for the two periods of the VHE detection and a quiescent state, using a one-zone model with the emission coming from a very compact region outside the broad line region. The three SEDs can be fit with a combination of synchrotron self-Compton and external Compton emission of seed photons from a dust torus, changing only the electron distribution parameters between the epochs. The fit of the optical/UV part of the spectrum for 2010 April 29 seems to favor an inner disk radius of

Published
2014

8. Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescope γ-Ray Observations of Earth’s Limb

Author

Ackermann, M, Ajello, M, Albert, A, Allafort, A, Baldini, L, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Blandford, RD, Bloom, ED, Bonamente, E, Bottacini, E, Bouvier, A, Brandt, TJ, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Cecchi, C, Charles, E, Chaves, RCG, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Cutini, S, Dalton, M, D'Ammando, F, de Angelis, A, de Palma, F, Dermer, CD, Digel, SW, Di Venere, L, do Couto e Silva, E, Drell, PS, Drlica-Wagner, A, Favuzzi, C, Fegan, SJ, Ferrara, EC, Focke, WB, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Gomez-Vargas, GA, Grenier, IA, Grove, JE, Guiriec, S, Gustafsson, M, Hadasch, D, Hanabata, Y, Harding, AK, Hayashida, M, Hayashi, K, Hewitt, JW, Horan, D, Hou, X, Hughes, RE, Inoue, Y, Jackson, MS, Jogler, T, Jóhannesson, G, Johnson, AS, Kamae, T, Kawano, T, Knödlseder, J, Kuss, M, Lande, J, Larsson, S, Latronico, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Mayer, M, Mazziotta, MN, McEnery, JE, Mehault, J, Michelson, PF, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, and Morselli, A

Subjects
Fermi LAT Collaboration, astro-ph.HE, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90  GeV-6  TeV (derived from a photon energy range 15 GeV-1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with index 2.68±0.04 and 2.61±0.08 above ∼200  GeV, respectively.

Published
2014

9. Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN

Author

Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Blandford, RD, Borgland, AW, Bregeon, J, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Cavazzuti, E, Cecchi, C, Chaves, RCG, Chekhtman, A, Cheung, CC, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, D'Ammando, F, de Angelis, A, Dermer, CD, Digel, SW, do Couto e Silva, E, Drell, PS, Drlica-Wagner, A, Favuzzi, C, Focke, WB, Franckowiak, A, Fukazawa, Y, Fusco, P, Gargano, F, Gasparrini, D, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Grove, JE, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Hughes, RE, Jackson, MS, Jogler, T, Knödlseder, J, Kuss, M, Lande, J, Larsson, S, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Mazziotta, MN, Mehault, J, Michelson, PF, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nemmen, R, Nuss, E, Ohsugi, T, Omodei, N, Orienti, M, Orlando, E, Paneque, D, Perkins, JS, Piron, F, Pivato, G, Prokhorov, D, Rainò, S, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Ritz, S, Romoli, C, Sánchez-Conde, M, Sanchez, DA, Sgrò, C, Siskind, EJ, Spandre, G, Spinelli, P, Takahashi, H, Tanaka, T, Tibaldo, L, Tinivella, M, Tosti, G, and Troja, E

Subjects
astroparticle physics, gamma rays: general, occultations, quasars: individual, Sun: X-rays, gamma rays, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics
Abstract

Observations of occultations of bright γ-ray sources by the Sun may reveal predicted pair halos around blazars and/or new physics, such as, e.g., hypothetical light dark matter particles-axions. We use Fermi Gamma-Ray Space Telescope (Fermi) data to analyze four occultations of blazar 3C 279 by the Sun on October 8 each year from 2008 to 2011. A combined analysis of the observations of these occultations allows a point-like source at the position of 3C 279 to be detected with significance of ≈3σ, but does not reveal any significant excess over the flux expected from the quiescent Sun. The likelihood ratio test rules out complete transparency of the Sun to the blazar γ-ray emission at a 3σ confidence level.

Published
2014

10. Dark matter constraints from observations of 25 Milky Way satellite galaxies with the Fermi Large Area Telescope

Author

Ackermann, M, Albert, A, Anderson, B, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Bissaldi, E, Bloom, ED, Bonamente, E, Bouvier, A, Brandt, TJ, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caragiulo, M, Caraveo, PA, Cecchi, C, Charles, E, Chekhtman, A, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, D’Ammando, F, de Angelis, A, Dermer, CD, Digel, SW, do Couto e Silva, E, Drell, PS, Drlica-Wagner, A, Essig, R, Favuzzi, C, Ferrara, EC, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giroletti, M, Godfrey, G, Gomez-Vargas, GA, Grenier, IA, Guiriec, S, Gustafsson, M, Hayashida, M, Hays, E, Hewitt, J, Hughes, RE, Jogler, T, Kamae, T, Knödlseder, J, Kocevski, D, Kuss, M, Larsson, S, Latronico, L, Garde, M Llena, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Martinez, G, Mayer, M, Mazziotta, MN, Michelson, PF, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nemmen, R, Nuss, E, Ohsugi, T, Orlando, E, Ormes, JF, Perkins, JS, Piron, F, Pivato, G, Porter, TA, Rainò, S, Rando, R, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Ritz, S, Sánchez-Conde, M, Sehgal, N, and Sgrò, C

Subjects
astro-ph.HE, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of astrophysical backgrounds, dwarf spheroidal galaxies are widely considered to be among the most promising targets for the indirect detection of dark matter via γ rays. Here we report on γ-ray observations of 25 Milky Way dwarf spheroidal satellite galaxies based on 4 years of Fermi Large Area Telescope (LAT) data. None of the dwarf galaxies are significantly detected in γ rays, and we present γ-ray flux upper limits between 500 MeV and 500 GeV. We determine the dark matter content of 18 dwarf spheroidal galaxies from stellar kinematic data and combine LAT observations of 15 dwarf galaxies to constrain the dark matter annihilation cross section. We set some of the tightest constraints to date on the annihilation of dark matter particles with masses between 2 GeV and 10 TeV into prototypical standard model channels. We find these results to be robust against systematic uncertainties in the LAT instrument performance, diffuse γ-ray background modeling, and assumed dark matter density profile. © 2014 American Physical Society.

Published
2014

11. The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks

Author

Preece, R, Burgess, J Michael, von Kienlin, A, Bhat, PN, Briggs, MS, Byrne, D, Chaplin, V, Cleveland, W, Collazzi, AC, Connaughton, V, Diekmann, A, Fitzpatrick, G, Foley, S, Gibby, M, Giles, M, Goldstein, A, Greiner, J, Gruber, D, Jenke, P, Kippen, RM, Kouveliotou, C, McBreen, S, Meegan, C, Paciesas, WS, Pelassa, V, Tierney, D, van der Horst, AJ, Wilson-Hodge, C, Xiong, S, Younes, G, Yu, H-F, Ackermann, M, Ajello, M, Axelsson, M, Baldini, L, Barbiellini, G, Baring, MG, Bastieri, D, Bellazzini, R, Bissaldi, E, Bonamente, E, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Cecchi, C, Charles, E, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Cominsky, LR, Conrad, J, D'Ammando, F, de Angelis, A, de Palma, F, Dermer, CD, Desiante, R, Digel, SW, Di Venere, L, Drell, PS, Drlica-Wagner, A, Favuzzi, C, Franckowiak, A, Fukazawa, Y, Fusco, P, Gargano, F, Gehrels, N, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Godfrey, G, Granot, J, Grenier, IA, Guiriec, S, Hadasch, D, Hanabata, Y, Harding, AK, Hayashida, M, Iyyani, S, Jogler, T, Jóhannesson, G, Kawano, T, Knödlseder, J, Kocevski, D, Kuss, M, Lande, J, Larsson, J, Larsson, S, Latronico, L, Longo, F, Loparco, F, and Lovellette, MN

Subjects
astro-ph.HE, General Science & Technology
Abstract

Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 seconds is possibly the brightest well-isolated pulse observed to date. A fine time resolution spectral analysis shows power-law decays of the peak energy from the onset of the pulse, consistent with models of internal synchrotron shock pulses. However, a strongly correlated power-law behavior is observed between the luminosity and the spectral peak energy that is inconsistent with curvature effects arising in the relativistic outflow. It is difficult for any of the existing models to account for all of the observed spectral and temporal behaviors simultaneously.

Published
2014

12. THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS

Author

Abdo, AA, Ajello, M, Allafort, A, Baldini, L, Ballet, J, Barbiellini, G, Baring, MG, Bastieri, D, Belfiore, A, Bellazzini, R, Bhattacharyya, B, Bissaldi, E, Bloom, ED, Bonamente, E, Bottacini, E, Brandt, TJ, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Burgay, M, Burnett, TH, Busetto, G, Buson, S, Caliandro, GA, Cameron, RA, Camilo, F, Caraveo, PA, Casandjian, JM, Cecchi, C, Çelik, Ö, Charles, E, Chaty, S, Chaves, RCG, Chekhtman, A, Chen, AW, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cognard, I, Cohen-Tanugi, J, Cominsky, LR, Conrad, J, Cutini, S, D'Ammando, F, de Angelis, A, DeCesar, ME, De Luca, A, Hartog, PR den, de Palma, F, Dermer, CD, Desvignes, G, Digel, SW, Di Venere, L, Drell, PS, Drlica-Wagner, A, Dubois, R, Dumora, D, Espinoza, CM, Falletti, L, Favuzzi, C, Ferrara, EC, Focke, WB, Franckowiak, A, Freire, PCC, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Gotthelf, EV, Grenier, IA, Grondin, M-H, Grove, JE, Guillemot, L, Guiriec, S, Hadasch, D, Hanabata, Y, Harding, AK, Hayashida, M, Hays, E, Hessels, J, Hewitt, J, Hill, AB, Horan, D, Hou, X, Hughes, RE, Jackson, MS, Janssen, GH, Jogler, T, Jóhannesson, G, Johnson, RP, and Johnson, AS

Subjects
catalogs, pulsars: general, stars: neutron, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics
Abstract

This catalog summarizes 117 high-confidence ≥0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on the Fermi satellite. Half are neutron stars discovered using LAT data through periodicity searches in gamma-ray and radio data around LAT unassociated source positions. The 117 pulsars are evenly divided into three groups: millisecond pulsars, young radio-loud pulsars, and young radio-quiet pulsars. We characterize the pulse profiles and energy spectra and derive luminosities when distance information exists. Spectral analysis of the off-peak phase intervals indicates probable pulsar wind nebula emission for four pulsars, and off-peak magnetospheric emission for several young and millisecond pulsars. We compare the gamma-ray properties with those in the radio, optical, and X-ray bands. We provide flux limits for pulsars with no observed gamma-ray emission, highlighting a small number of gamma-faint, radio-loud pulsars. The large, varied gamma-ray pulsar sample constrains emission models. Fermi's selection biases complement those of radio surveys, enhancing comparisons with predicted population distributions. © 2013. The American Astronomical Society. All rights reserved..

Published
2013

13. CONSTRAINTS ON THE GALACTIC POPULATION OF TeV PULSAR WIND NEBULAE USING FERMI LARGE AREA TELESCOPE OBSERVATIONS

Author

Acero, F, Ackermann, M, Ajello, M, Allafort, A, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Blandford, RD, Bloom, ED, Bonamente, E, Bottacini, E, Brandt, TJ, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Cecchi, C, Charles, E, Chaves, RCG, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Cutini, S, Dalton, M, D'Ammando, F, de Palma, F, Dermer, CD, Di Venere, L, do Couto e Silva, E, Drell, PS, Drlica-Wagner, A, Falletti, L, Favuzzi, C, Fegan, SJ, Ferrara, EC, Focke, WB, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grégoire, T, Grenier, IA, Grondin, M-H, Grove, JE, Guiriec, S, Hadasch, D, Hanabata, Y, Harding, AK, Hayashida, M, Hayashi, K, Hays, E, Hewitt, J, Hill, AB, Horan, D, Hou, X, Hughes, RE, Inoue, Y, Jackson, MS, Jogler, T, Jóhannesson, G, Johnson, AS, Kamae, T, Kawano, T, Kerr, M, Knödlseder, J, Kuss, M, Lande, J, Larsson, S, Latronico, L, Lemoine-Goumard, M, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Marelli, M, Massaro, F, Mayer, M, Mazziotta, MN, McEnery, JE, Mehault, J, Michelson, PF, and Mitthumsiri, W

Subjects
gamma rays: general, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics
Abstract

Pulsar wind nebulae (PWNe) have been established as the most populous class of TeV γ-ray emitters. Since launch, the Fermi Large Area Telescope (LAT) has identified five high-energy (100 MeV < E < 100 GeV) γ-ray sources as PWNe and detected a large number of PWN candidates, all powered by young and energetic pulsars. The wealth of multi-wavelength data available and the new results provided by Fermi-LAT give us an opportunity to find new PWNe and to explore the radiative processes taking place in known ones. The TeV γ-ray unidentified (UNID) sources are the best candidates for finding new PWNe. Using 45 months of Fermi-LAT data for energies above 10 GeV, an analysis was performed near the position of 58 TeV PWNe and UNIDs within 5° of the Galactic plane to establish new constraints on PWN properties and find new clues on the nature of UNIDs. Of the 58 sources, 30 were detected, and this work provides their γ-ray fluxes for energies above 10 GeV. The spectral energy distributions and upper limits, in the multi-wavelength context, also provide new information on the source nature and can help distinguish between emission scenarios, i.e., between classification as a pulsar candidate or as a PWN candidate. Six new GeV PWN candidates are described in detail and compared with existing models. A population study of GeV PWN candidates as a function of the pulsar/PWN system characteristics is presented. © 2013. The American Astronomical Society. All rights reserved.

Published
2013

14. Measurement of the charged multiplicity of events containing bottom hadrons at Ec.m.=91 GeV.

Author

Schumm, BA, Koetke, DS, Adolphsen, CE, Alexander, JP, Averill, D, Barish, BC, Barklow, T, Barnett, BA, Blockus, D, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, JM, Drell, PS, Drewer, DC, Durrett, D, Elia, R, Feldman, GJ, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Gomez Cadenas JJ, Gratta, G, Hanson, G, Harr, R, Harral, B, Harris, FA, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kenney, C, King, M, Komamiya, S, Kowalski, LA, Kral, JF, and Kuhlen, M

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Using an impact-parameter tag to select an enriched sample of Z0bb» events, we have measured the difference between the average charged multiplicity of bb» and all hadronic Z0 decays to be 2.11.8(stat) 0.6(syst) tracks per event. The resulting total (nonleading) charged multiplicity for Z0 bb» events is 23.1(12.0)1.8 0.6 tracks. A comparison of this nonleading multiplicity to hadronic multiplicity data in the range of 10 to 60 GeV supports the hypothesis of flavor-independent hadronic fragmentation, and yields a measurement of the average energy fraction of bottom hadrons in Z0 decays of xEb=0.620.100.04. © 1992 The American Physical Society.

Published
1992

15. Measurement of the charged multiplicity of events containing bottom hadrons at Ec. m.=91 GeV

Author

Schumm, BA, Koetke, DS, Adolphsen, CE, Alexander, JP, Averill, D, Barish, BC, Barklow, T, Barnett, BA, Blockus, D, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, JM, Drell, PS, Drewer, DC, Durrett, D, Elia, R, Feldman, GJ, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gratta, G, Hanson, G, Harr, R, Harral, B, Harris, FA, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kenney, C, King, M, Komamiya, S, Kowalski, LA, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, Rouse, FR, Rust, DR, Sadrozinski, HFW, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, Soderstrom, E, Stoker, DP, Stroynowski, R, Swartz, M, Thun, R, and Trilling, GH

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Using an impact-parameter tag to select an enriched sample of Z0bb» events, we have measured the difference between the average charged multiplicity of bb» and all hadronic Z0 decays to be 2.11.8(stat) 0.6(syst) tracks per event. The resulting total (nonleading) charged multiplicity for Z0 bb» events is 23.1(12.0)1.8 0.6 tracks. A comparison of this nonleading multiplicity to hadronic multiplicity data in the range of 10 to 60 GeV supports the hypothesis of flavor-independent hadronic fragmentation, and yields a measurement of the average energy fraction of bottom hadrons in Z0 decays of xEb=0.620.100.04. © 1992 The American Physical Society.

Published
1992

16. Measurement of the bb¯ fraction in hadronic Z0 decays with precision vertex detectors

Author

Jacobsen, RG, Koetke, DS, Adolphsen, CE, Fujino, D, Schumm, BA, Wagner, SR, Alexander, JP, Averill, D, Barish, BC, Barklow, T, Barnett, BA, Blockus, D, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, JM, Drell, PS, Drewer, DC, Durrett, D, Elia, R, Feldman, GJ, Field, RC, Ford, WT, Fordham, C, Frey, R, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gratta, G, Hanson, G, Harr, R, Harral, B, Harris, FA, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jaros, JA, Jung, CK, Kadyk, JA, Kenney, C, King, M, Komamiya, S, Kowalski, LA, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, Rust, DR, Sadrozinski, HFW, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, Soderstrom, E, Stoker, DP, Stroynowski, R, Swartz, M, Thun, R, and Trilling, GH

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have measured the fraction of bb» events in hadronic Z0 decays, Rbb», using the vertex detector system of the Mark II detector at the SLAC Linear Collider. We tag bb» events by requiring the coincidence of three or more tracks with significant impact parameters. This tag is 50% efficient and results in a sample of 85% purity. We find Rbb»=0.251+0.049+0.030, in good agreement with other measurements and the standard model prediction. © 1991 The American Physical Society.

Published
1991

17. Measurement of the bb-bar fraction in hadronic Z0 decays with precision vertex detectors.

Author

Jacobsen, RG, Koetke, DS, Adolphsen, CE, Fujino, D, Schumm, BA, Wagner, SR, Alexander, JP, Averill, D, Barish, BC, Barklow, T, Barnett, BA, Blockus, D, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, JM, Drell, PS, Drewer, DC, Durrett, D, Elia, R, Feldman, GJ, Field, RC, Ford, WT, Fordham, C, Frey, R, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Gomez Cadenas JJ, Gratta, G, Hanson, G, Harr, R, Harral, B, Harris, FA, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jaros, JA, Jung, CK, Kadyk, JA, Kenney, C, King, M, Komamiya, S, Kowalski, LA, and Kral, JF

Subjects
General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

We have measured the fraction of bb» events in hadronic Z0 decays, Rbb», using the vertex detector system of the Mark II detector at the SLAC Linear Collider. We tag bb» events by requiring the coincidence of three or more tracks with significant impact parameters. This tag is 50% efficient and results in a sample of 85% purity. We find Rbb»=0.251+0.049+0.030, in good agreement with other measurements and the standard model prediction. © 1991 The American Physical Society.

Published
1991

18. Search for elastic nondiagonal lepton-pair production in e+e- annihilation at √s =29 GeV

Author

Gomez-Cadenas, JJ, Heusch, CA, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koide, A, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Li, Z, Litke, AM, Lockyer, NS, Lüth, V, Matteuzzi, C, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O’Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, and Richter, B

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have searched for the annihilation of e+e- into the exclusive channels e and at s =29 GeV, using 226 and 133 pb-1, respectively, of data taken with the Mark II detector at the SLAC storage ring PEP. The resulting candidate sample is compatible with the expected background from pair production. Our analysis yields 95%-C.L. cross-section limits of e/

Published
1991

19. Search for elastic nondiagonal lepton-pair production in e+e- annihilation at sqrt s =29 GeV.

Author

Gomez-Cadenas, JJ, Heusch, CA, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, and Jaffre, M

Subjects
General Physics, Physical Sciences
Abstract

We have searched for the annihilation of e+e- into the exclusive channels e and at s =29 GeV, using 226 and 133 pb-1, respectively, of data taken with the Mark II detector at the SLAC storage ring PEP. The resulting candidate sample is compatible with the expected background from pair production. Our analysis yields 95%-C.L. cross-section limits of e/

Published
1991

20. Measurement of the total hadronic cross section in e+e- annihilation at sqrt s =29 GeV.

Author

von Zanthier C, de Boer W, Grindhammer, G, Hylen, J, Harral, B, Hearty, C, Labarga, L, Matthews, J, Schaad, M, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, and Hutchinson, D

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

A precise measurement of the ratio R of the total cross section e+e-hadrons to the pointlike cross section e+e-+- at a center-of-mass energy of 29.0 GeV is presented. The data were taken with the upgraded Mark II detector at the SLAC storage ring PEP. The result is R=3.920.050.09. The luminosity has been determined with three independent luminosity monitors measuring Bhabha scattering at different angular intervals. Recent calculations of higher-order QED radiative corrections are used to estimate the systematic error due to missing higher-order radiative corrections in the Monte Carlo event generators. © 1991 The American Physical Society.

Published
1991

21. Measurement of the total hadronic cross section in e+e- annihilation at s=29 GeV

Author

von Zanthier, C, de Boer, W, Grindhammer, G, Hylen, J, Harral, B, Hearty, C, Labarga, L, Matthews, J, Schaad, M, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hutchinson, D, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Levi, ME, Li, Z, Litke, AM, Lüth, V, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Riles, K, Rust, DR, Sadrozinski, HFW, and Schalk, TL

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

A precise measurement of the ratio R of the total cross section e+e-hadrons to the pointlike cross section e+e-+- at a center-of-mass energy of 29.0 GeV is presented. The data were taken with the upgraded Mark II detector at the SLAC storage ring PEP. The result is R=3.920.050.09. The luminosity has been determined with three independent luminosity monitors measuring Bhabha scattering at different angular intervals. Recent calculations of higher-order QED radiative corrections are used to estimate the systematic error due to missing higher-order radiative corrections in the Monte Carlo event generators. © 1991 The American Physical Society.

Published
1991

22. A reanalysis of B0-B̄0 mixing in e+e- annihilation at 29 GeV

Author

Weir, AJ, Abrams, G, Adolphsen, CE, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Barish, BC, Barklow, T, Barnett, BA, Bartelt, I, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylef, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, Schaad, T, and Schalk, TL

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Data taken by the Mark II detector at the PEP storage ring was used to measure the rate of dilepton production in multihadronic events produced by e+e- annihilation at √s=29 GeV. We determine the probability that a hadron initially containing a b (b̄) quark decays to a positive (negative) lepton to be 0.17-0.08+0.15, with 90% confidence level limits of 0.06 and 0.38. © 1990.

Published
1990

23. Measurement of the B0-meson lifetime.

Author

Wagner, SR, Hinshaw, DA, Ong, RA, Snyder, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, and Innes, WR

Subjects
General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We report a measurement of the lifetime of the B0 meson based upon 29-GeV e+e- annihilation data taken with the Mark II detector at the SLAC storage ring PEP. The B0 mesons are tagged by their decays into D*- and D*+, where the D*- is tagged by its decay into -D 0. We reconstruct the decay vertices of 15 B0-meson candidates and measure the B0 lifetime to be 1.20-0.360.14+0.52+0.16 psec. © 1990 The American Physical Society.

Published
1990

24. Upper limits on D+/- and B+/- decays to two leptons plus pi +/- or K+/-

Author

Weir, AJ, Klein, SR, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, and Jaros, JA

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

Data taken by the Mark II detector at the SLAC e+e- storage ring PEP was used to search for exclusive decays of D and B mesons into two charged leptons plus a charged pion or kaon. All possible charge and lepton combinations consistent with charge conservation were considered and no evidence for any signals was found. We obtain upper limits for the various branching ratios ranging from 2.5×10-3 to 9.2×10-3, at a 90% confidence level. Some of these limits can be used to constrain leptoquark masses in various models. © 1990 The American Physical Society.

Published
1990

25. Upper limits on D± and B± decays to two leptons plus π± or K±

Author

Weir, AJ, Klein, SR, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, and Schaad, T

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Data taken by the Mark II detector at the SLAC e+e- storage ring PEP was used to search for exclusive decays of D and B mesons into two charged leptons plus a charged pion or kaon. All possible charge and lepton combinations consistent with charge conservation were considered and no evidence for any signals was found. We obtain upper limits for the various branching ratios ranging from 2.5×10-3 to 9.2×10-3, at a 90% confidence level. Some of these limits can be used to constrain leptoquark masses in various models. © 1990 The American Physical Society.

Published
1990

26. P-wave charmed mesons in e+e- annihilation

Author

Avery, P, Besson, D, Garren, L, Yelton, J, Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, Richard, Wolinski, J, Xiao, D, Ammar, R, Baringer, P, Haas, P, Lam, Ha, Jawahery, A, Park, CH, Nelson, JK, Perticone, D, Poling, R, Chen, W-Y, Dominick, J, McIlwain, RL, Miller, DH, Ng, CR, Schaffner, SF, Shibata, EI, Yao, W-M, Sparks, K, Thorndike, EH, Alam, MS, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Bortoletto, D, Goldberg, M, Horwitz, N, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Alexander, J, Artuso, M, Bebek, C, Berkelman, K, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Katayama, N, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, and Sadoff, AJ

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have found evidence for L=1 charmed mesons in e+e- annihilations. We observe a D**0 state at mass 2461±3±1 MeV/c2 and width 20-12-10+9+9 MeV/c2 decaying to D+-. We also see an enhancement in the m(D*+-)-m(D*+) mass-difference spectrum and by examining D*+ decay-angle dependence, we see structure consistent with two states decaying to D*+-. We observe a lower-mass state, at mass (2428±3±2) MeV/c2 and width (23-6-4+8+10) MeV/c2, assuming that the higher-mass component is from the decay D**0(2461)D*+-. We present arguments for the spin-parity assignments of these states. We also report observation of candidate L=1 cs» state decaying to D*+Ks0. © 1990 The American Physical Society.

Published
1990

27. Search for neutrinoless decays of the τ lepton

Author

Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, Richard, Wolinski, J, Xiao, D, Ammar, R, Baringer, P, Coppage, D, Haas, P, Lam, Ha, Jawahery, A, Park, CH, Kubota, Y, Nelson, JK, Perticone, D, Poling, R, Chen, W-Y, Dominick, J, McIlwain, RL, Miller, DH, Ng, CR, Schaffner, SF, Shibata, EI, Yao, W-M, Sparks, K, Thorndike, EH, Alam, MS, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Bortoletto, D, Goldberg, M, Horwitz, N, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Alexander, J, Artuso, M, Bebek, C, Berkelman, K, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Katayama, N, Kreinick, DL, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, Sadoff, AJ, Avery, P, Besson, D, Garren, L, and Yelton, J

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have searched for neutrinoless decays into three charged particles. Evidence of such decays would demonstrate nonconservation of lepton flavor and, in some cases, lepton number. We see no signal for any such neutrinoless decays and set upper limits on their branching fractions. © 1990 The American Physical Society.

Published
1990

28. Search for neutrinoless decays of the tau lepton.

Author

Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, R, Wolinski, J, Xiao, D, Ammar, R, Baringer, P, Coppage, D, Haas, P, Lam, H, Jawahery, A, Park, CH, Kubota, Y, Nelson, JK, Perticone, D, Poling, R, Chen, W, Dominick, J, McIlwain, RL, Miller, DH, Ng, CR, Schaffner, SF, Shibata, EI, Yao, W, Sparks, K, Thorndike, EH, Alam, MS, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Bortoletto, D, Goldberg, M, Horwitz, N, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IP, Skwarnicki, T, Csorna, SE, Letson, T, Alexander, J, Artuso, M, Bebek, C, Berkelman, K, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, and Gittelman, B

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We have searched for neutrinoless decays into three charged particles. Evidence of such decays would demonstrate nonconservation of lepton flavor and, in some cases, lepton number. We see no signal for any such neutrinoless decays and set upper limits on their branching fractions. © 1990 The American Physical Society.

Published
1990

29. Measurement of the muonic branching fractions of the Υ(1S) and Υ(3S)

Author

Chen, W-Y, McIlwain, RL, Miller, DH, Ng, CR, Shibata, EI, Yao, W-M, Thorndike, EH, Alam, MS, Katayama, N, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Bortoletto, D, Goldberg, M, Horwitz, N, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Brock, IC, Ferguson, T, Artuso, M, Bebek, C, Berkelman, K, Blucher, E, Byrd, J, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeSalvo, R, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Kowalewski, R, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O’Grady, C, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, Sadoff, AJ, Avery, P, Besson, D, Garren, L, Yelton, J, Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, Richard, Wolinski, J, Xiao, D, Baringer, P, Haas, P, Lam, Ha, Jawahery, A, Park, CH, Perticone, D, Poling, R, Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, and Whitmore, J

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have measured the muonic branching fractions B of the (1S) and (3S) to be (2.520.070.07)% and (2.020.190.33)%, respectively. © 1989 The American Physical Society.

Published
1989

30. First measurements of hadronic decays of the Z boson

Author

Abrams, GS, Adolphsen, CE, Aleksan, R, Alexander, JP, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, de Boer, W, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Drewer, DC, Elia, R, Fay, J, Feldman, GJ, Fernandes, D, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Herrup, D, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Holmgren, S-O, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaffre, M, Jaros, JA, Jung, CK, Kadyk, JA, Karlen, D, Kent, J, King, M, Klein, SR, Koetke, DS, Komamiya, S, Koska, W, Kowalski, LA, Kozanecki, W, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Le Diberder, F, Levi, ME, Litke, AM, Lüth, V, Lynch, GR, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, and Nitz, D

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have observed hadronic final states produced in the decays of Z bosons. In order to study the parton structure of these events, we compare the distributions in sphericity, thurst, aplanarity, and number of jets to the predictions of several QCD-based models and to data from lower energies. The data and models agree within the present statistical precision. © 1989 The American Physical Society.

Published
1989

31. Measurement of Ds decay modes

Author

Chen, W-Y, McIlwain, RL, Miller, DH, Ng, CR, Shibata, EI, Yao, W-M, Sparks, K, Thorndike, EH, Alam, MS, Katayama, N, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Bortoletto, D, Goldberg, M, Horwitz, N, Lubrano, P, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Brock, IC, Ferguson, T, Alexander, J, Artuso, M, Bebek, C, Berkelman, K, Blucher, E, Byrd, J, Cassel, DG, Cheu, E, Coffman, DM, Copie, T, Crawford, G, DeSalvo, R, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, Sadoff, AJ, Avery, P, Besson, D, Garren, L, Yelton, J, Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, Richard, Wolinski, J, Xiao, D, Baringer, P, Haas, P, Lam, Ha, Jawahery, A, Park, CH, Perticone, D, Poling, R, Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, and Whitmore, J

Subjects
Intellectual and Developmental Disabilities (IDD), Down Syndrome, Brain Disorders, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Using the CLEO detector, we have measured the branching ratios for the exclusive decays of the Ds+ meson into K*0K+, K0K+, and K*+K0 relative to the decay Ds+→φπ+ to be close to unity. We have also measured the mass diference between the Ds+ and D+ meson to be 98.5±1.5 MeV/c2. © 1989.

Published
1989

32. First observation of inclusive ψ production in ψ decays

Author

Collaboration, CLEO, Fulton, R, Haas, P, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Baringer, P, Chen, W-Y, McIlwain, RL, Miller, DH, Ng, CR, Shibata, EI, Yao, W-M, Alam, MS, Chen, D, Katayama, N, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Tanikella, V, Bortoletto, D, Goldberg, M, Horwitz, N, Lubrano, P, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Brock, IC, Ferguson, T, Artuso, M, Bebek, C, Berkelman, K, Blucher, E, Byrd, J, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeSalvo, R, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Kowalewski, R, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Perticone, D, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, Sadoff, AJ, Avery, P, Besson, D, Garren, L, Yelton, J, Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, Richard, Wolinski, J, Xiao, D, Jawahery, A, Park, CH, and Poling, R

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

The branching ratio for inclusive ψ production in ψ(1S) decays is measured to be (0.11 ± 0.04 ± 0.02)%. © 1989.

Published
1989

33. Measurement of the isospin mass splitting Ξ+cΞ0c

Author

Alam, MS, Katayama, N, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Bortoletto, D, Goldberg, M, Horwitz, N, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Brock, IC, Ferguson, T, Alexander, J, Artuso, M, Bebek, C, Berkelman, K, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, Dewire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Kowalewski, R, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, Sadoff, AJ, Avery, P, Besson, D, Garren, L, Yelton, J, Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, Richard, Wolinski, J, Xiao, D, Ammar, R, Baringer, P, Haas, P, Lam, Ha, Jawahery, A, Park, CH, Perticone, D, Poling, R, Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Chen, W-Y, Dominick, J, McIlwain, RL, Miller, DH, Ng, CR, Shibata, EI, Yao, W-M, Sparks, K, and Thorndike, EH

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Using the CLEO detector, we present a measurement of the mass of the charged charmed strange baryon Ξ+c and its neutral counterpart the Ξ0c. The Ξ+c is observed through its decay to Ξ-π+π+, and its mass is measured to be (2467±3±4) MeV. The isospin mass splitting of the Ξc system is found to be M(Ξ+c)-M(Ξ0c)=(-5±4±1)MeV. © 1989.

Published
1989

34. A search for exclusive penguin decays of B mesons

Author

Avery, P, Besson, D, Garren, L, Yelton, J, Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, Richard, Wolinski, J, Xiao, D, Baringer, P, Haas, P, Lam, Ha, Jawahery, A, Park, CH, Perticone, D, Poling, R, Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Chen, W-Y, Dominick, J, McIlwain, RL, Miller, DH, Ng, CR, Shibata, EI, Yao, W-M, Thorndike, EH, Alam, MS, Katayama, N, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Bortoletto, D, Goldberg, M, Horwitz, N, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Brock, IC, Ferguson, T, Artuso, M, Bebek, C, Byrd, J, Berkelman, K, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Kowalewski, R, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, and Sadoff, AJ

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

We have measured upper limits on branching fractions for rare exclusive decays of B mesons arising from one-loop diagrams in the standard model of electroweak interactions. We also obtain an upper limit for the lepton-number-violating decay B0→μ±e∓. © 1989.

Published
1989

35. Search for B-decay to Higgs bosons for Higgs boson masses between 50 and 210 MeV/c2

Author

Snyder, A, Murray, WN, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidel, D, Baden, AR, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Leclaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, and Schaad, T

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

We use data from the Mark II experiment at PEP to search for the process B→h0X for mh0 between 50 and 210 MeV/c2. No evidence for the Higgs boson is seen in this mass range. The limit obtained rules out the standard Higgs boson for masses between 70 and 210 MeV/c2 and significantly constrains extensions of the Higgs sector. © 1989.

Published
1989

36. The Mark II detector for the SLC

Author

Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Averill, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, De Boer, W, Bonvicini, G, Boswell, C, Boyarski, A, Boyer, J, Brabson, B, Braune, K, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Drewer, DC, Fay, J, Feldman, GJ, Fernandes, D, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gatto, C, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gong, X, Gratta, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Herrup, D, Heusch, CA, Himel, T, Hinshaw, DA, Hoenk, M, Holmgren, S-O, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaffre, M, Jaros, JA, Jung, CK, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, King, M, Klein, SR, Koepke, L, Koetke, D, Koide, A, Komamiya, S, Koska, W, Kowalski, LA, Kozanecki, W, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Levi, ME, and Li, Z

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics
Abstract

The Mark II detector has been upgraded in preparation for its role as the first detector to take data at the Stanford Linear Collider. The new detector components include the central drift chamber, the time-of-flight system, the coil, the endcap electromagnetic calorimeters and the beam energy and luminosity measuring devices. There have also been improvements in detector hermeticity. All of the major components were installed for a test run at the PEP storage ring (√s = 29 GeV) in 1985. This paper describes the upgraded detector, including its trigger and data acquisition systems, and gives performance figures for its components. Future improvements are also discussed. © 1989.

Published
1989

37. Determination of alpha s from energy-energy correlations in e+e- annihilation at 29 GeV.

Author

Wood, DR, Petersen, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, and Innes, WR

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We have studied the energy-energy correlation in e+e- annihilation into hadrons at s =29 GeV using the Mark II detector at the SLAC storage ring PEP. We find to O(s2) that s=0.1580.0030.008 if hadronization is described by string fragmentation. Independent fragmentation schemes give s=0.100.14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well. © 1988 The American Physical Society.

Published
1988

38. Measurement of the muonic branching fractions of the Upsilon (1S) and Upsilon (3S).

Author

Chen, W, McIlwain, RL, Miller, DH, Ng, CR, Shibata, EI, Yao, W, Thorndike, EH, Alam, MS, Katayama, N, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Bortoletto, D, Goldberg, M, Horwitz, N, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IP, Skwarnicki, T, Csorna, SE, Letson, T, Brock, IC, Ferguson, T, Artuso, M, Bebek, C, Berkelman, K, Blucher, E, Byrd, J, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeSalvo, R, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Kowalewski, R, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, and Sadoff, AJ

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have measured the muonic branching fractions B of the (1S) and (3S) to be (2.520.070.07)% and (2.020.190.33)%, respectively. © 1989 The American Physical Society.

Published
1989

39. Studies of jet production rates ine+e− annihilation atEcm=29 GeV

Author

Bethke, S, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bullos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, F, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Komamiya, S, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Levi, ME, Li, Z, Litke, AM, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Riles, K, Rust, DR, Sadrozinski, HFW, Schalk, TL, Schmidke, WB, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, and Soderstrom, E

Subjects
Nuclear & Particles Physics
Abstract

Production rates of multijet hadronic final states are studied in e+e- annihilation at 29 GeV center of mass energy. QCD shower model calculations with exact first order matrix element weighting at the first gluon vertex are capable of reproducing the observed multijet event rates over a large range of jet pair masses. The method used to reconstruct jets is well suited for directly comparing experimental jet rates with parton rates calculated in perturbative QCD. Evidence for the energy dependene of αs is obtained by comparing the observed production rates of 3-jet events with results of similar studies performed at higher center of mass energies. © 1989 Springer-Verlag.

Published
1989

40. Multihadronic events at Ec.m.=29 GeV and predictions of QCD models from Ec.m.=29 GeV to Ec.m.=93 GeV

Author

Petersen, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koide, A, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Li, Z, Litke, AM, Lockyer, NS, Matteuzzi, C, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Porter, FC, Rankin, P, Richter, B, and Riles, K

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Multihadronic e+e- annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q2-Q1, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e+e- data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z0, are also presented. © 1988 The American Physical Society.

Published
1988

41. Initial measurements of Z-boson resonance parameters in e+e- annihilation.

Author

Abrams, GS, Adolphsen, CE, Aleksan, R, Alexander, JP, Allen, MA, Atwood, WB, Averill, D, Ballam, J, Bambade, P, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, de Boer W, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Breidenbach, M, Brom, JM, Brown, JL, Brown, KL, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Clendenin, J, Cords, D, Coupal, DP, Dauncey, P, Dean, NR, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Drewer, DC, Dydak, F, Ecklund, S, Elia, R, Erickson, RA, Fay, J, Feldman, GJ, Fernandes, D, Field, RC, Fieguth, TH, Fischer, GE, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gatto, C, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Gomez Cadenas JJ, Gratta, G, Grindhammer, G, and Grosse-Wiesmann, P

Subjects
General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

We have measured the mass of the Z boson to be 91.110.23 GeV/c2, and its width to be 1.61-0.43+0.60 GeV. If we constrain the visible width to its standard-model value, we find the partial width to invisible decay modes to be 0.620.23 GeV, corresponding to 3.81.4 neutrino species. © 1989 The American Physical Society.

Published
1989

42. Determination of αs from energy-energy correlations in e+e- annihilation at 29 GeV

Author

Wood, DR, Petersen, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koide, A, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Li, Z, Litke, AM, Lockyer, NS, Lüth, V, Matteuzzi, C, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Porter, FC, and Rankin, P

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Affordable and Clean Energy, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

We have studied the energy-energy correlation in e+e- annihilation into hadrons at s =29 GeV using the Mark II detector at the SLAC storage ring PEP. We find to O(s2) that s=0.1580.0030.008 if hadronization is described by string fragmentation. Independent fragmentation schemes give s=0.100.14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well. © 1988 The American Physical Society.

Published
1988

43. Studies of jet production rates in e+e- annihilation at Ecm=29 GeV

Author

Bethke, S, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bullos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, F, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Komamiya, S, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Levi, ME, Li, Z, Litke, AM, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Riles, K, Rust, DR, Sadrozinski, HFW, Schalk, TL, Schmidke, WB, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, and Soderstrom, E

Subjects
Nuclear & Particles Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Production rates of multijet hadronic final states are studied in e+e- annihilation at 29 GeV center of mass energy. QCD shower model calculations with exact first order matrix element weighting at the first gluon vertex are capable of reproducing the observed multijet event rates over a large range of jet pair masses. The method used to reconstruct jets is well suited for directly comparing experimental jet rates with parton rates calculated in perturbative QCD. Evidence for the energy dependene of αs is obtained by comparing the observed production rates of 3-jet events with results of similar studies performed at higher center of mass energies. © 1989 Springer-Verlag.

Published
1989

44. First observation of inclusive ψ production in ψ decays

Author

Fulton, R, Haas, P, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Baringer, P, Chen, WY, McIlwain, RL, Miller, DH, Ng, CR, Shibata, EI, Yao, WM, Alam, MS, Chen, D, Katayama, N, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Tanikella, V, Bortoletto, D, Goldberg, M, Horwitz, N, Lubrano, P, Mestayer, MD, Moneti, GC, Sharma, V, Shipsey, IPJ, Skwarnicki, T, Csorna, SE, Letson, T, Brock, IC, Ferguson, T, Artuso, M, Bebek, C, Berkelman, K, Blucher, E, Byrd, J, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeSalvo, R, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Kowalewski, R, Kreinick, DL, Kubota, Y, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R, Nandi, S, Nordberg, E, O'Grady, C, Perticone, D, Peterson, D, Pisharody, M, Riley, D, Sapper, M, Silverman, A, Stone, S, Worden, H, Worris, M, Sadoff, AJ, Avery, P, Besson, D, Garren, L, Yelton, J, Bowcock, T, Kinoshita, K, Pipkin, FM, Procario, M, Wilson, R, Wolinski, J, Xiao, D, Jawahery, A, Park, CH, and Poling, R

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The branching ratio for inclusive ψ production in ψ(1S) decays is measured to be (0.11 ± 0.04 ± 0.02)%. © 1989.

Published
1989

45. Search for lepton-flavor-violating decays of B mesons

Author

Edwards, KW, Ammar, R, Besson, D, Zhao, X, Anderson, S, Frolov, VV, Kubota, Y, Lee, SJ, Li, SZ, Poling, R, Smith, A, Stepaniak, CJ, Urheim, J, Metreveli, Z, Seth, KK, Tomaradze, A, Zweber, P, Ahmed, S, Alam, MS, Jian, L, Saleem, M, Wappler, F, Eckhart, E, Gan, KK, Gwon, C, Hart, T, Honscheid, K, Hufnagel, D, Kagan, H, Kass, R, Pedlar, TK, Thayer, JB, von Toerne, E, Wilksen, T, Zoeller, MM, Muramatsu, H, Richichi, SJ, Severini, H, Skubic, P, Dytman, SA, Mueller, JA, Nam, S, Savinov, V, Chen, S, Hinson, JW, Lee, J, Miller, DH, Pavlunin, V, Shibata, EI, Shipsey, IPJ, Cronin-Hennessy, D, Lyon, AL, Park, CS, Park, W, Thorndike, EH, Coan, TE, Gao, YS, Liu, F, Maravin, Y, Narsky, I, Stroynowski, R, Artuso, M, Boulahouache, C, Bukin, K, Dambasuren, E, Khroustalev, K, Mountain, R, Nandakumar, R, Skwarnicki, T, Stone, S, Wang, JC, Mahmood, AH, Csorna, SE, Danko, I, Xu, Z, Bonvicini, G, Cinabro, D, Dubrovin, M, McGee, S, Bornheim, A, Lipeles, E, Pappas, SP, Shapiro, A, Sun, WM, Weinstein, AJ, Masek, G, Paar, HP, Mahapatra, R, Briere, RA, Chen, GP, Ferguson, T, Tatishvili, G, Vogel, H, Adam, NE, Alexander, JP, Berkelman, K, Blanc, F, Boisvert, V, Cassel, DG, Drell, PS, Duboscq, JE, Ecklund, KM, Ehrlich, R, Gibbons, L, Gittelman, B, Gray, SW, Hartill, DL, Heltsley, BK, Hsu, L, Jones, CD, Kandaswamy, J, Kreinick, DL, Magerkurth, A, Mahlke-Kruger, H, Meyer, TO, Mistry, NB, Nordberg, E, Patterson, JR, Peterson, D, Pivarski, J, Riley, D, Sadoff, AJ, Schwarthoff, H, Shepherd, MR, Thayer, JG, Urner, D, Valant-Spaight, B, Viehhauser, G, Warburton, A, Weinberger, M, Athar, SB, Avery, P, Breva-Newell, L, Potlia, V, Stoeck, H, Yelton, J, Brandenburg, G, Ershov, A, Kim, DYJ, Wilson, R, Benslama, K, Eisenstein, BI, Ernst, J, Gollin, GD, Hans, RM, Karliner, I, Lowrey, N, Marsh, MA, Plager, C, Sedlack, C, Selen, M, Thaler, JJ, Williams, J, and Collaboration, CLEO

Subjects
Nuclear physics, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, FOS: Physical sciences, B meson, Flavor, High Energy Physics - Experiment, Lepton
Abstract

We have searched a sample of 9.6 million BB-bar events for the lepton-flavor-violating decays B --> h e^{+-} mu^{-+}, B^+ --> h^- e^+ e^+, B^+ --> h^- e^+ mu^+, and B^+ --> h^- mu^+ mu^+, where h is pi, K, rho, and K*(892), a total of sixteen modes. We find no evidence for these decays, and place 90% confidence level upper limits on their branching fractions that range from 1.0 to 8.3 X 10^{-6}., 8 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, PRD RC

Published
2016

46. DEEP MORPHOLOGICAL and SPECTRAL STUDY of the SNR RCW 86 with FERMI-LAT

Author

Ajello, M, Baldini, L, Barbiellini, G, Bastieri, D, Bellazzini, R, Bissaldi, E, Bloom, ED, Bonino, R, Bottacini, E, Brandt, TJ, Bregeon, J, Bruel, P, Buehler, R, Caliandro, GA, Cameron, RA, Caragiulo, M, Cavazzuti, E, Charles, E, Chekhtman, A, Ciprini, S, Cohen-Tanugi, J, Condon, B, Costanza, F, Cutini, S, D'Ammando, F, Palma, FD, Desiante, R, Lalla, ND, Mauro, MD, Venere, LD, Drell, PS, Dubner, G, Dumora, D, Duvidovich, L, Favuzzi, C, Focke, WB, Fusco, P, Gargano, F, Gasparrini, D, Giacani, E, Giglietto, N, Glanzman, T, Green, DA, Grenier, IA, Guiriec, S, Hays, E, Hewitt, JW, Hill, AB, Horan, D, Jogler, T, Jóhannesson, G, Jung-Richardt, I, Kensei, S, Kuss, M, Larsson, S, Latronico, L, Lemoine-Goumard, M, Li, J, Li, L, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Magill, J, Maldera, S, Manfreda, A, Mayer, M, Mazziotta, MN, McEnery, JE, Michelson, PF, Mitthumsiri, W, Mizuno, T, Monzani, ME, Morselli, A, Moskalenko, IV, Negro, M, Nuss, E, Orienti, M, Orlando, E, Ormes, JF, Paneque, D, Perkins, JS, Pesce-Rollins, M, Piron, F, Pivato, G, Porter, TA, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Schmid, J, Schulz, A, Sgrò, C, Simone, D, Siskind, EJ, Spada, F, Spandre, G, Spinelli, P, Green, David [0000-0003-3189-9998], and Apollo - University of Cambridge Repository

Subjects
cosmic rays, ISM: individual objects (RCW 86), acceleration of particles
Abstract

RCW 86 is a young supernova remnant (SNR) showing a shell-type structure at several wavelengths and is thought to be an efficient cosmic-ray (CR) accelerator. Earlier \textit{Fermi} Large Area Telescope results reported the detection of $\gamma$-ray emission coincident with the position of RCW 86 but its origin (leptonic or hadronic) remained unclear due to the poor statistics. Thanks to 6.5 years of data acquired by the \textit{Fermi}-LAT and the new event reconstruction Pass 8, we report the significant detection of spatially extended emission coming from RCW 86. The spectrum is described by a power-law function with a very hard photon index ($\Gamma = 1.42 \pm 0.1_{\rm stat} \pm 0.06_{\rm syst}$) in the 0.1--500 GeV range and an energy flux above 100 MeV of ($2.91$ $\pm$ $0.8_{\rm stat}$ $\pm$ $0.12_{\rm syst}$) $\times$ $10^{-11}$ erg cm$^{-2}$ s$^{-1}$. Gathering all the available multiwavelength (MWL) data, we perform a broadband modeling of the nonthermal emission of RCW 86 to constrain parameters of the nearby medium and bring new hints about the origin of the $\gamma$-ray emission. For the whole SNR, the modeling favors a leptonic scenario in the framework of a two-zone model with an average magnetic field of 10.2 $\pm$ 0.7 $\mu$G and a limit on the maximum energy injected into protons of 2 $\times$ 10$^{49}$ erg for a density of 1 cm$^{-3}$. In addition, parameter values are derived for the North-East (NE) and South-West (SW) regions of RCW 86, providing the first indication of a higher magnetic field in the SW region.

Published
2016

47. ASSOCIATING LONG-TERM gamma-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I+61 degrees 303

Author

Ackermann M, Ajello M, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Bonamente E, Brandt TJ, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cavazzuti E, Cecchi C, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen Tanugi J, Cominsky LR, Conrad J, Cutini S, Dalton M, de Angelis A, Den Hartog PR, de Palma F, Dermer CD, Digel SW, Di Venere L, Drell PS, Dubois R, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Franckowiak A, Funk S, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Guiriec S, Hadasch D, Hanabata Y, Harding AK, Hayashida M, Hays E, Hill AB, Horan D, Hughes RE, Jogler T, Johannesson G, Johnson AS, Johnson TJ, Kawano T, Kerr M, Knodlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lemoine Goumard M, Li J, Longo F, Lovellette MN, Lubrano P, Mayer M, Mazziotta MN, McEnery JE, Michelson PF, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nemmen R, Nuss E, Ohsugi T, Okumura A, Orienti M, Orlando E, Ormes JF, Paneque D, Papitto A, Perkins JS, Pesce Rollins M, Piron F, Pivato G, Raino S, Rando R, Razzano M, Rea N, Reimer A, Reimer O, Scargle JD, Schulz A, Sgro C, Siskind EJ, Spandre G, Spinelli P, Takahashi H, Thayer JG, Thayer JB, Tinivella M, Torres DF, Tosti G, Troja E, Uchiyama Y, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Werner M, Winer BL, Wood KS, D'AMMANDO, FILIPPO, Ackermann M, Ajello M, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Bonamente E, Brandt TJ, Bregeon J, Brigida M, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cavazzuti E, Cecchi C, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Cominsky LR, Conrad J, Cutini S, Dalton M, DAmmando F, de Angelis A, Den Hartog PR, de Palma F, Dermer CD, Digel SW, Di Venere L, Drell PS, Dubois R, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Franckowiak A, Funk S, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Guiriec S, Hadasch D, Hanabata Y, Harding AK, Hayashida M, Hays E, Hill AB, Horan D, Hughes RE, Jogler T, Johannesson G, Johnson AS, Johnson TJ, Kawano T, Kerr M, Knodlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lemoine-Goumard M, Li J, Longo F, Lovellette MN, Lubrano P, Mayer M, Mazziotta MN, McEnery JE, Michelson PF, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nemmen R, Nuss E, Ohsugi T, Okumura A, Orienti M, Orlando E, Ormes JF, Paneque D, Papitto A, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Raino S, Rando R, Razzano M, Rea N, Reimer A, Reimer O, Scargle JD, Schulz A, Sgro C, Siskind EJ, Spandre G, Spinelli P, Takahashi H, Thayer JG, Thayer JB, Tinivella M, Torres DF, Tosti G, Troja E, Uchiyama Y, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Werner M, Winer BL, and Wood KS

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Gamma rays: general, Astrophysics::Solar and Stellar Astrophysics, stars: emission-line, gamma rays: stars, stars: emission-line, Be, Be, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, gamma rays: general – gamma rays: stars – stars: emission-line, Be, Astrophysics::Galaxy Astrophysics
Abstract

Gamma-ray binaries are stellar systems for which the spectral energy distribution (discounting the thermal stellar emission) peaks at high energies. Detected from radio to TeV gamma rays, the gamma-ray binary LS I + 61 degrees 303 is highly variable across all frequencies. One aspect of this system's variability is the modulation of its emission with the timescale set by the similar to 26.4960 day orbital period. Here we show that, during the time of our observations, the gamma-ray emission of LS I + 61 degrees 303 also presents a sinusoidal variability consistent with the previously known superorbital period of 1667 days. This modulation is more prominently seen at orbital phases around apastron, whereas it does not introduce a visible change close to periastron. It is also found in the appearance and disappearance of variability at the orbital period in the power spectrum of the data. This behavior could be explained by a quasi-cyclical evolution of the equatorial outflow of the Be companion star, whose features influence the conditions for generating gamma rays. These findings open the possibility to use gamma-ray observations to study the outflows of massive stars in eccentric binary systems.

Published
2013

48. FERMI LARGE AREA TELESCOPE STUDY OF COSMIC-RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS

Author

Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford RD, Bloom ED, Bonamente E, Borgland AW, Bottacini E, Brandt TJ, Bregeon J, Brigida M, Bruel P, Buehler R, Busetto G, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen Tanugi J, Conrad J, de Angelis A, de Palma F, Dermer CD, Digel SW, Silva EDE, Drell PS, Drlica Wagner A, Falletti L, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Fukazawa Y, Fukui Y, Funk S, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Grondin MH, Grove JE, Guiriec S, Hadasch D, Hanabata Y, Harding AK, Hayashi K, Horan D, Hou X, Hughes RE, Itoh R, Jackson MS, Johannesson G, Johnson AS, Kamae T, Katagiri H, Kataoka J, Knodlseder J, Kuss M, Lande J, Larsson S, Lee SH, Lemoine Goumard M, Longo F, Loparco F, Lovellette MN, Lubrano P, Martin P, Mazziotta MN, McEnery JE, Mehault J, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monte C, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Naumann Godo M, Nemmen R, Nishino S, Norris JP, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes JF, Ozaki M, Paneque D, Panetta JH, Parent D, Pesce Rollins M, Pierbattista M, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Romoli C, Roth M, Sada T, Sadrozinski HFW, Sanchez DA, Sbarra C, Sgro C, Siskind EJ, Spandre G, Spinelli P, Strong AW, Suson DJ, Takahashi H, Takahashi T, Tanaka T, Thayer JG, Thayer JB, Thompson DJ, Tibaldo L, Tibolla O, Tinivella M, Torres DF, Tosti G, Tramacere A, Troja E, Uchiyama Y, Uehara T, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite AP, Wang P, Winer BL, Wood KS, Yamamoto H, Yang Z, Zimmer S., D'AMMANDO, FILIPPO, Ackermann M, Ajello M, Allafort A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford RD, Bloom ED, Bonamente E, Borgland AW, Bottacini E, Brandt TJ, Bregeon J, Brigida M, Bruel P, Buehler R, Busetto G, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, DAmmando F, de Angelis A, de Palma F, Dermer CD, Digel SW, Silva EDE, Drell PS, Drlica-Wagner A, Falletti L, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Fukazawa Y, Fukui Y, Funk S, Fusco P, Gargano F, Gasparrini D, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Grondin MH, Grove JE, Guiriec S, Hadasch D, Hanabata Y, Harding AK, Hayashi K, Horan D, Hou X, Hughes RE, Itoh R, Jackson MS, Johannesson G, Johnson AS, Kamae T, Katagiri H, Kataoka J, Knodlseder J, Kuss M, Lande J, Larsson S, Lee SH, Lemoine-Goumard M, Longo F, Loparco F, Lovellette MN, Lubrano P, Martin P, Mazziotta MN, McEnery JE, Mehault J, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monte C, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Naumann-Godo M, Nemmen R, Nishino S, Norris JP, Nuss E, Ohno M, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes JF, Ozaki M, Paneque D, Panetta JH, Parent D, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Romoli C, Roth M, Sada T, Sadrozinski HFW, Sanchez DA, Sbarra C, Sgro C, Siskind EJ, Spandre G, Spinelli P, Strong AW, Suson DJ, Takahashi H, Takahashi T, Tanaka T, Thayer JG, Thayer JB, Thompson DJ, Tibaldo L, Tibolla O, Tinivella M, Torres DF, Tosti G, Tramacere A, Troja E, Uchiyama Y, Uehara T, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, Waite AP, Wang P, Winer BL, Wood KS, Yamamoto H, Yang Z, and Zimmer S

Subjects
gamma rays: ISM, cosmic ray
Abstract

We report an analysis of the interstellar γ-ray emission from the Chamaeleon, R Coronae Australis (R CrA), and Cepheus and Polaris flare regions with the Fermi Large Area Telescope. They are among the nearest molecular cloud complexes, within ~300 pc from the solar system. The γ-ray emission produced by interactions of cosmic rays (CRs) and interstellar gas in those molecular clouds is useful to study the CR densities and distributions of molecular gas close to the solar system. The obtained γ-ray emissivities above 250 MeV are (5.9 ± 0.1stat +0.9 –1.0sys) × 10^–27 photons s^–1 sr^–1 H-atom–1, (10.2 ± 0.4stat +1.2 –1.7sys) × 10^–27 photons s^–1 sr^–1 H-atom^–1, and (9.1 ± 0.3stat +1.5 –0.6sys) × 10^–27 photons s^–1 sr^–1 H-atom^–1 for the Chamaeleon, R CrA, and Cepheus and Polaris flare regions, respectively. Whereas the energy dependences of the emissivities agree well with that predicted from direct CR observations at the Earth, the measured emissivities from 250 MeV to 10 GeV indicate a variation of the CR density by ~20% in the neighborhood of the solar system, even if we consider systematic uncertainties. The molecular mass calibrating ratio, X CO = N(H2)/W CO, is found to be (0.96 ± 0.06stat +0.15 –0.12sys) × 10^20 H2-molecule cm^–2 (K km s^–1)^–1, (0.99 ± 0.08stat +0.18 –0.10sys) × 10^20 H2-molecule cm^–2 (K km s^–1)^–1, and (0.63 ± 0.02stat +0.09 –0.07sys) × 10^20 H2-molecule cm^–2 (K km s^–1)^–1 for the Chamaeleon, R CrA, and Cepheus and Polaris flare regions, respectively, suggesting a variation of X CO in the vicinity of the solar system. From the obtained values of X CO, the masses of molecular gas traced by W CO in the Chamaeleon, R CrA, and Cepheus and Polaris flare regions are estimated to be ~5 × 10^3 M ☉, ~10^3 M ☉, and ~3.3 × 10^4 M ☉, respectively. A comparable amount of gas not traced well by standard H I and CO surveys is found in the regions investigated.

Published
2013

49. ERRATUM: MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER (vol 726, pg 43, 2011)

Author

Abdo, Aa, Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, Denis, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, Rd, Bonamente, E, Borgland, Aw, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Buson, Sara, Caliandro, Ga, Cameron, Ra, Caraveo, Pa, Carrigan, S, Casandjian, Jm, Cavazzuti, E, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, Cc, Chiang, J, Ciprini, S, Claus, R, COHEN TANUGI, J, Conrad, J, Costamante, L, Cutini, S, Davis, Ds, Dermer, Cd, DE PALMA, F, Digel, Sw, Silva, Ede, Drell, Ps, Dubois, R, Dumora, D, Favuzzi, C, Fegan, Sj, Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, Ia, Grove, Je, Guillemot, L, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Horan, D, Hughes, Re, Itoh, R, Johannesson, G, Johnson, As, Johnson, Tj, Johnson, Wn, Kamae, T, Katagiri, H, Kataoka, J, Knodlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, Sh, Longo, F, Loparco, F, Lott, B, Lovellette, Mn, Lubrano, P, Makeev, A, Mazziotta, Mn, Mcenery, Je, Mehault, J, Michelson, Pf, Mizuno, T, Moiseev, Aa, Monte, C, Monzani, Me, Morselli, A, Moskalenko, Iv, Murgia, S, Nakamori, T, NAUMANN GODO, M, Nestoras, I, Nolan, Pl, Norris, Jp, Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, Jf, Ozaki, M, Paneque, D, Panetta, Jh, Parent, D, Pelassa, V, Pepe, M, PESCE ROLLINS, M, Piron, F, Porter, Ta, Raino, S, Rando, Riccardo, Razzano, M, Reimer, A, Reimer, O, Reyes, Lc, Ripken, J, Ritz, S, Romani, Rw, Roth, M, Sadrozinski, Hfw, Sanchez, D, Sander, A, Scargle, Jd, Sgro, C, Shaw, Ms, Smith, Pd, Spandre, G, Spinelli, P, Strickman, Ms, Suson, Dj, Takahashi, H, Tanaka, T, Thayer, Jb, Thayer, Jg, Thompson, Dj, Tibaldo, Luigi, Torres, Df, Tosti, G, Tramacere, A, Usher, Tl, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, Ap, Wang, P, Winer, Bl, Wood, Ks, Yang, Z, Ylinen, T, Ziegler, M, Acciari, Va, Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Boltuch, D, Bradbury, Sm, Buckley, Jh, Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Christiansen, Jl, Ciupik, L, Cui, W, Perez, Id, Dickherber, R, Errando, M, Falcone, A, Finley, Jp, Finnegan, G, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, Gh, Godambe, S, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Hui, Cm, Humensky, Tb, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, Mj, Lebohec, S, Maier, G, Mcarthur, S, Mccann, A, Mccutcheon, M, Moriarty, P, Mukherjee, R, Ong, Ra, Otte, An, Pandel, D, Perkins, Js, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, Pt, Roache, E, Rose, Hj, Schroedter, M, Sembroski, Gh, Senturk, Gd, Smith, Aw, Steele, D, Swordy, Sp, Tesic, G, Theiling, M, Thibadeau, S, Varlotta, A, Vassiliev, Vv, Vincent, S, Wakely, Sp, Ward, Je, Weekes, Tc, Weinstein, A, Weisgarber, T, Williams, Da, Wissel, S, Wood, M, Villata, M, Raiteri, Cm, Gurwell, Ma, Larionov, Vm, Kurtanidze, Om, Aller, Mf, Lahteenmaki, A, Chen, Wp, Berduygin, A, Agudo, I, Aller, Hd, Arkharov, Aa, Bach, U, Bachev, R, Beltrame, P, Benitez, E, Buemi, Cs, Dashti, J, Calcidese, P, Capezzali, D, Carosati, D, DA RIO, D, DI PAOLA, A, Diltz, C, Dolci, M, Dultzin, D, Forne, E, Gomez, Jl, HAGEN THORN VA, Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, Hy, Jorstad, Sg, Kimeridze, Gn, Konstantinova, Ts, Kopatskaya, En, Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, Jm, Marscher, Ap, Mommert, M, Mujica, R, Nikolashvili, Mg, Nilsson, K, Palma, N, Pasanen, M, ROCA SOGORB, M, Ros, Ja, Roustazadeh, P, Sadun, Ac, Saino, J, Sigua, La, Sillanaa, A, Sorcia, M, Takalo, Lo, Tornikoski, M, Trigilio, C, Turchetti, R, Umana, G, Belloni, T, Blake, Ch, Bloom, Js, Angelakis, E, Fumagalli, M, Hauser, M, Prochaska, Jx, Riquelme, D, Sievers, A, Starr, Dl, Tagliaferri, G, Ungerechts, H, Wagner, S, and Zensus, Ja

Published
2011

50. The first fermi large area telescope catalog of gamma-ray pulsars (vol 187, pg 460, 2010)

Author

Abdo, Aa, Ackermann, M, Ajello, M, Atwood, Wb, Axelsson, M, Baldini, L, Ballet, J, Barbiellini, G, Baring, Mg, Bastieri, D, Baughman, Bm, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, Rd, Bloom, Ed, Bonamente, E, Borgland, Aw, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Burnett, Th, Buson, S, Caliandro, Ga, Cameron, Ra, Camilo, F, Caraveo, Pa, Casandjian, Jm, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, Cc, Chiang, J, Ciprini, S, Claus, R, Cognard, I, Cohen Tanugi, J, Cominsky, Lr, Conrad, J, Corbet, R, Cutini, S, den Hartog PR, Dermer, Cd, DE ANGELIS, Alessandro, de Luca, A, de Palma, F, Digel, Sw, Dormody, M, Silva, Ede, Drell, Ps, Dubois, R, Dumora, D, Espinoza, C, Farnier, C, Favuzzi, C, Fegan, Sj, Ferrara, Ec, Focke, Wb, Fortin, P, Frailis, M, Freire, Pcc, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giavitto, G, Giebels, B, Giglietto, N, Giommi, P, Giordano, F, Glanzman, T, Godfrey, G, Gotthelf, Ev, Grenier, Ia, Grondin, Mh, Grove, Je, Guillemot, L, Guiriec, S, Gwon, C, Hanabata, Y, Harding, Ak, Hayashida, M, Hays, E, Hughes, Re, Jackson, Ms, Johannesson, G, Johnson, As, Johnson, Rp, Johnson, Tj, Johnson, Wn, Johnston, S, Kamae, T, Kanbach, G, Kaspi, Vm, Katagiri, H, Kataoka, J, Kawai, N, Kerr, M, Knoedlseder, J, Kocian, Ml, Kramer, M, Kuss, M, Lande, J, Latronico, L, Lemoine Goumard, M, Livingstone, M, Longo, F, Loparco, F, Lott, B, Lovellette, Mn, Lubrano, P, Lyne, Ag, Madejski, Gm, Makeev, A, Manchester, Rn, Marelli, M, Mazziotta, Mn, Mcconville, W, Mcenery, Je, Mcglynn, S, Meurer, C, Michelson, Pf, Mineo, T, Mitthumsiri, W, Mizuno, T, Moiseev, Aa, Monte, C, Monzani, Me, Morselli, A, Moskalenko, Iv, Murgia, S, Nakamori, T, Nolan, Pl, Norris, Jp, Noutsos, A, Nuss, E, Ohsugi, T, Omodei, N, Orlando, E, Ormes, Jf, Ozaki, M, Paneque, D, Panetta, Jh, Parent, D, Pelassa, V, Pepe, M, Pesce Rollins, M, Piron, F, Porter, Ta, Raino, S, Rando, R, Ransom, Sm, Ray, Ps, Razzano, M, Rea, N, Reimer, A, Reimer, O, Reposeur, T, Ritz, S, Rodriguez, Ay, Romani, Rw, Roth, M, Ryde, F, Sadrozinski, Hfw, Sanchez, D, Sander, A, Parkinson, Pms, Scargle, Jd, Schalk, Tl, Sellerholm, A, Sgro, C, Siskind, Ej, Smith, Da, Smith, Pd, Spandre, G, Spinelli, P, Stappers, Bw, Starck, Jl, Striani, E, Strickman, Ms, Strong, Aw, Suson, Dj, Tajima, H, Takahashi, H, Takahashi, T, Tanaka, T, Thayer, Jb, Thayer, Jg, Theureau, G, Thompson, Dj, Thorsett, Se, Tibaldo, L, Tibolla, O, Torres, Df, Tosti, G, Tramacere, A, Uchiyama, Y, Usher, Tl, Van Etten, A, Vasileiou, V, Venter, C, Vilchez, N, Vitale, V, Waite, Ap, Wang, P, Wang, N, Watters, K, Weltevrede, P, Winer, Bl, Wood, Ks, Ylinen, T, Ziegler, M., Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Camilo, F., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Celik, Oe., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cognard, I., Cohen-Tanugi, J., Cominsky, L. R., Conrad, J., Corbet, R., Cutini, S., den Hartog, P. R., Dermer, C. D., de Angelis, A., de Luca, A., de Palma, F., Digel, S. W., Dormody, M., do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Espinoza, C., Farnier, C., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Fortin, P., Frailis, M., Freire, P. C. C., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giavitto, G., Giebels, B., Giglietto, N., Giommi, P., Giordano, F., Glanzman, T., Godfrey, G., Gotthelf, E. V., Grenier, I. A., Grondin, M. -H., Grove, J. E., Guillemot, L., Guiriec, S., Gwon, C., Hanabata, Y., Harding, A. K., Hayashida, M., Hays, E., Hughes, R. E., Jackson, M. S., Johannesson, G., Johnson, A. S., Johnson, R. P., Johnson, T. J., Johnson, W. N., Johnston, S., Kamae, T., Kanbach, G., Kaspi, V. M., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knoedlseder, J., Kocian, M. L., Kramer, M., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Livingstone, M., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Lyne, A. G., Madejski, G. M., Makeev, A., Manchester, R. N., Marelli, M., Mazziotta, M. N., Mcconville, W., Mcenery, J. E., Mcglynn, S., Meurer, C., Michelson, P. F., Mineo, T., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Nolan, P. L., Norris, J. P., Noutsos, A., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E, Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Raino, S., Rando, R., Ransom, S. M., Ray, P. S., Razzano, M., Rea, N., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rodriguez, A. Y., Romani, R. W., Roth, M., Ryde, F., Sadrozinski, H. F. -W., Sanchez, D., Sander, A., Parkinson P. M., Saz, Scargle, J. D., Schalk, T. L., Sellerholm, A., Sgro, C., Siskind, E. J., Smith, D. A., Smith, P. D., Spandre, G., Spinelli, P., Stappers, B. W., Starck, J. -L., Striani, E., Strickman, M. S., Strong, A. W., Suson, D. J., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J. B., Thayer, J. G., Theureau, G., Thompson, D. J., Thorsett, S. E., Tibaldo, L., Tibolla, O., Torres, D. F., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T. L., Van Etten, A., Vasileiou, V., Venter, C., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Wang, N., Watters, K., Weltevrede, P., Winer, B. L., Wood, K. S., Ylinen, T., and Ziegler, M.

Published
2011

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