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12 results on '"Frawley AD"'

1. Cross section for b b¯ production via dielectrons in d + Au collisions at sNN =200 GeV CROSS SECTION for b b¯ PRODUCTION VIA ⋯ A. ADARE et al.

Author

Adare, A, Aidala, C, Ajitanand, NN, Akiba, Y, Al-Bataineh, H, Alexander, J, Angerami, A, Aoki, K, Apadula, N, Aramaki, Y, Atomssa, ET, Averbeck, R, Awes, TC, Azmoun, B, Babintsev, V, Bai, M, Baksay, G, Baksay, L, Barish, KN, Bassalleck, B, Basye, AT, Bathe, S, Baublis, V, Baumann, C, Bazilevsky, A, Belikov, S, Belmont, R, Bennett, R, Bhom, JH, Blau, DS, Bok, JS, Boyle, K, Brooks, ML, Buesching, H, Bumazhnov, V, Bunce, G, Butsyk, S, Campbell, S, Caringi, A, Chen, CH, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Choudhury, RK, Christiansen, P, Chujo, T, Chung, P, Chvala, O, Cianciolo, V, Citron, Z, Cole, BA, Conesa Del Valle, Z, Connors, M, Csanád, M, Csörgo, T, Dahms, T, Dairaku, S, Danchev, I, Das, K, Datta, A, David, G, Dayananda, MK, Denisov, A, Deshpande, A, Desmond, EJ, Dharmawardane, KV, Dietzsch, O, Dion, A, Donadelli, M, Drapier, O, Drees, A, Drees, KA, Durham, JM, Durum, A, Dutta, D, D'Orazio, L, Edwards, S, Efremenko, YV, Ellinghaus, F, Engelmore, T, Enokizono, A, En'Yo, H, Esumi, S, Fadem, B, Fields, DE, Finger, M, Fleuret, F, Fokin, SL, Fraenkel, Z, Frantz, JE, Franz, A, Frawley, AD, Fujiwara, K, Fukao, Y, Fusayasu, T, Garishvili, I, Glenn, A, and Gong, H

Subjects
nucl-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We report a measurement of e+e- pairs from semileptonic heavy-flavor decays in d+Au collisions at sNN=200 GeV. By exploring the mass and transverse-momentum dependence of the yield, the bottom decay contribution can be isolated from charm, and quantified by comparison to pythia and mc@nlo simulations. The resulting bb¯-production cross section is σbb¯dAu=1.37±0.28(stat)±0.46(syst) mb, which is equivalent to a nucleon-nucleon cross section of σbbNN=3.4±0.8(stat)±1.1(syst)μb.

Published
2015

2. Heavy quarkonium: progress, puzzles, and opportunities

Author

Brambilla, N, Eidelman, S, Heltsley, BK, Vogt, R, Bodwin, GT, Eichten, E, Frawley, AD, Meyer, AB, Mitchell, RE, Papadimitriou, V, Petreczky, P, Petrov, AA, Robbe, P, Vairo, A, Andronic, A, Arnaldi, R, Artoisenet, P, Bali, G, Bertolin, A, Bettoni, D, Brodzicka, J, Bruno, GE, Caldwell, A, Catmore, J, Chang, C-H, Chao, K-T, Chudakov, E, Cortese, P, Crochet, P, Drutskoy, A, Ellwanger, U, Faccioli, P, Gabareen Mokhtar, A, Garcia i Tormo, X, Hanhart, C, Harris, FA, Kaplan, DM, Klein, SR, Kowalski, H, Lansberg, J-P, Levichev, E, Lombardo, V, Lourenço, C, Maltoni, F, Mocsy, A, Mussa, R, Navarra, FS, Negrini, M, Nielsen, M, Olsen, SL, Pakhlov, P, Pakhlova, G, Peters, K, Polosa, AD, Qian, W, Qiu, J-W, Rong, G, Sanchis-Lozano, MA, Scomparin, E, Senger, P, Simon, F, Stracka, S, Sumino, Y, Voloshin, M, Weiss, C, Wöhri, HK, and Yuan, C-Z

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

A golden age for heavy-quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly found conventional states expanded to include hc(1P), χc2(2P), B+c, and ηb(1S). In addition, the unexpected and still-fascinating X(3872) has been joined by more than a dozen other charmonium- and bottomonium-like "XYZ" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cā, bē, and bā bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrial-strength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hot- and coldnuclear- matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts. © Springer-Verlag / Società Italiana di Fisica 2011.

Published
2011

3. The PHENIX experiment at RHIC

Author

Morrison, DP, Akiba, Y, Alford, O, Allen, M, Allen, W, Alley, G, Arai, Y, Archuleta, JB, Archuleta, JR, Aronson, SH, Statekin, I, Autrey, D, Awes, TC, Barlag, C, Barrette, J, Bassalleck, B, Bathe, S, Batygin, Y, Baublis, V, Bazilevsky, A, Begay, R, Behrendt, J, Belikov, S, Bellavia, S, Belyaev, S, Bennett, MJ, Berdnikov, Y, Bernardin, J, Bluhm, DD, Blume, C, Bohne, EM, Boissevain, JG, Bosze, E, Bowers, J, Branning, J, Britton, CL, Brooks, ML, Bryan, WL, Bucher, D, Buesching, H, Bumazhnov, V, Bunce, G, Butsyk, S, Cafferty, M, Carey, TA, Chand, P, Chang, J, Chang, W-C, Chappell, R, Charagi, SK, Chavez, LL, Chernichenko, S, Chi, C-Y, Chiba, J, Chikanian, A, Choudhury, RK, Chung, MS, Cianciolo, V, Clark, D, Claussen, A, Coe, S, Cole, B, Conway, R, Cope, L, Crook, D, Cunitz, H, Cunningham, R, Daniel, SQ, David, G, Denisov, A, Desmond, EJ, Dietzsch, O, Dinesh, BV, Durrant, S, Durum, A, Dutta, D, Efremenko, YV, Eiseman, S, Emery, MS, Enosawa, K, En'yo, H, Ericson, MN, Evseev, V, Ferriera, J, Fields, DE, Filimonov, K, Fokin, S, Fong, D, Fraenkel, Z, Frank, SS, Frawley, AD, Fried, J, Fung, SY, Gan, D, Gannon, J, Gavin, S, Gee, TF, Gim, B, Goto, Y, and Greene, SV

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

The physics emphases of the PHENIX collaboration and the design and currentstatus of the PHENIX detector are discussed. The plan of the collaboration formaking the most effective use of the available luminosity in the first years ofRHIC operation is also presented.

Published
1998

4. Measurement of charm and bottom production from semileptonic hadron decays in p+p collisions at s=200 GeV

Author

Aidala, C, Akiba, Y, Alfred, M, Andrieux, V, Apadula, N, Asano, H, Azmoun, B, Babintsev, V, Bandara, NS, Barish, KN, Bathe, S, Bazilevsky, A, Beaumier, M, Belmont, R, Berdnikov, A, Berdnikov, Y, Blau, DS, Bok, JS, Brooks, ML, Bryslawskyj, J, Bumazhnov, V, Campbell, S, Canoa Roman, V, Cervantes, R, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Citron, Z, Connors, M, Cronin, N, Csanád, M, Csörgo, T, Danley, TW, Daugherity, MS, David, G, Deblasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Dion, A, Dixit, D, Do, JH, Drees, A, Drees, KA, Durham, JM, Durum, A, Enokizono, A, En'Yo, H, Esumi, S, Fadem, B, Fan, W, Feege, N, Fields, DE, Finger, M, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Fukuda, Y, Gal, C, Gallus, P, Gamez, EA, Garg, P, Ge, H, Giordano, F, Goto, Y, Grau, N, Greene, SV, Grosse Perdekamp, M, Gunji, T, Guragain, H, Hachiya, T, Haggerty, JS, Hahn, KI, Hamagaki, H, Hamilton, HF, Han, SY, Hanks, J, Hasegawa, S, Haseler, TOS, He, X, Hemmick, TK, Hill, JC, Hill, K, Hodges, A, Hollis, RS, Homma, K, Hong, B, Hoshino, T, Hotvedt, N, Huang, J, Huang, S, Imai, K, Inaba, M, Iordanova, A, Isenhower, D, and Ishimaru, S

Subjects
Quantum Physics, Particle and Plasma Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear Experiment, nucl-ex, Atomic, Nuclear & Particles Physics, Astronomical and Space Sciences
Abstract

Measurements of the differential production of electrons from open-heavy-flavor hadrons with charm- and bottom-quark content in p+p collisions at s=200 GeV are presented. The measurements proceed through displaced-vertex analyses of electron tracks from the semileptonic decay of charm and bottom hadrons using the PHENIX silicon-vertex detector. The relative contribution of electrons from bottom decays to inclusive heavy-flavor-electron production is found to be consistent with fixed-order-plus-next-to-leading-log perturbative-QCD calculations within experimental and theoretical uncertainties. These new measurements in p+p collisions provide a precision baseline for comparable forthcoming measurements in A+A collisions.

Published
2019

5. Measurements of μμ pairs from open heavy flavor and Drell-Yan in p+p collisions at s=200 GeV

Author

Aidala, C, Akiba, Y, Alfred, M, Andrieux, V, Apadula, N, Asano, H, Azmoun, B, Babintsev, V, Bagoly, A, Bandara, NS, Barish, KN, Bathe, S, Bazilevsky, A, Beaumier, M, Belmont, R, Berdnikov, A, Berdnikov, Y, Blau, DS, Boer, M, Bok, JS, Brooks, ML, Bryslawskyj, J, Bumazhnov, V, Campbell, S, Canoa Roman, V, Cervantes, R, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Citron, Z, Connors, M, Cronin, N, Csanád, M, Csörgo, T, Danley, TW, Daugherity, MS, David, G, Deblasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Dion, A, Dixit, D, Do, JH, Drees, A, Drees, KA, Durham, JM, Durum, A, Enokizono, A, En'Yo, H, Esumi, S, Fadem, B, Fan, W, Feege, N, Fields, DE, Finger, M, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Fukuda, Y, Gal, C, Gallus, P, Garg, P, Ge, H, Giordano, F, Goto, Y, Grau, N, Greene, SV, Grosse Perdekamp, M, Gunji, T, Guragain, H, Hachiya, T, Haggerty, JS, Hahn, KI, Hamagaki, H, Hamilton, HF, Han, SY, Hanks, J, Hasegawa, S, Haseler, TOS, He, X, Hemmick, TK, Hill, JC, Hill, K, Hodges, A, Hollis, RS, Homma, K, Hong, B, Hoshino, T, Hotvedt, N, Huang, J, Huang, S, Imai, K, Inaba, M, Iordanova, A, and Isenhower, D

Subjects
Quantum Physics, Particle and Plasma Physics, hep-ex, High Energy Physics::Phenomenology, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear Experiment, Atomic, Nuclear & Particles Physics, Astronomical and Space Sciences
Abstract

PHENIX reports differential cross sections of μμ pairs from semileptonic heavy-flavor decays and the Drell-Yan production mechanism measured in p+p collisions at s=200 GeV at forward and backward rapidity (1.2

Published
2019

6. Nonperturbative-transverse-momentum broadening in dihadron angular correlations in sNN=200GeV proton-nucleus collisions

Author

Aidala, C, Akiba, Y, Alfred, M, Andrieux, V, Apadula, N, Asano, H, Azmoun, B, Babintsev, V, Bandara, NS, Barish, KN, Bathe, S, Bazilevsky, A, Beaumier, M, Belmont, R, Berdnikov, A, Berdnikov, Y, Blau, DS, Boer, M, Bok, JS, Brooks, ML, Bryslawskyj, J, Bumazhnov, V, Campbell, S, Canoa Roman, V, Cervantes, R, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Citron, Z, Connors, M, Cronin, N, Csanád, M, Csörgo, T, Danley, TW, Daugherity, MS, David, G, Deblasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Dion, A, Dixit, D, Do, JH, Drees, A, Drees, KA, Durham, JM, Durum, A, Enokizono, A, En'Yo, H, Esumi, S, Fadem, B, Fan, W, Feege, N, Fields, DE, Finger, M, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Fukuda, Y, Gal, C, Gallus, P, Garg, P, Ge, H, Giordano, F, Goto, Y, Grau, N, Greene, SV, Grosse Perdekamp, M, Gunji, T, Guragain, H, Hachiya, T, Haggerty, JS, Hahn, KI, Hamagaki, H, Hamilton, HF, Han, SY, Hanks, J, Hasegawa, S, Haseler, TOS, He, X, Hemmick, TK, Hill, JC, Hill, K, Hodges, A, Hollis, RS, Homma, K, Hong, B, Hoshino, T, Hotvedt, N, Huang, J, Huang, S, Imai, K, Inaba, M, Iordanova, A, Isenhower, D, and Ivanishchev, D

Subjects
Particle and Plasma Physics, hep-ex, Molecular, Nuclear, Nuclear Experiment, nucl-ex, Atomic, Nuclear & Particles Physics
Abstract

The PHENIX collaboration has measured high-pT dihadron correlations in p+p, p+Al, and p+Au collisions at sNN=200 GeV. The correlations arise from inter- and intrajet correlations and thus have sensitivity to nonperturbative effects in both the initial and final states. The distributions of pout, the transverse-momentum component of the associated hadron perpendicular to the trigger hadron, are sensitive to initial- and final-state transverse momenta. These distributions are measured multidifferentially as a function of xE, the longitudinal momentum fraction of the associated hadron with respect to the trigger hadron. The near-side pout widths, sensitive to fragmentation transverse momentum, show no significant broadening between p+Au, p+Al, and p+p. The away-side nonperturbative pout widths are found to be broadened in p+Au when compared to p+p; however, there is no significant broadening in p+Al compared to p+p collisions. The data also suggest that the away-side pout broadening is a function of Ncoll, the number of binary nucleon-nucleon collisions, in the interaction. The potential implications of these results with regard to initial- and final-state transverse-momentum broadening and energy loss of partons in a nucleus, among other nuclear effects, are discussed.

Published
2019

7. Multiparticle azimuthal correlations for extracting event-by-event elliptic and triangular flow in Au + Au collisions at sNN =200 GeV

Author

Adare, A, Aidala, C, Ajitanand, NN, Akiba, Y, Alfred, M, Apadula, N, Asano, H, Azmoun, B, Babintsev, V, Bagoly, A, Bai, M, Bandara, NS, Bannier, B, Barish, KN, Bathe, S, Bazilevsky, A, Beaumier, M, Beckman, S, Belmont, R, Berdnikov, A, Berdnikov, Y, Blau, DS, Boer, M, Bok, JS, Boyle, K, Brooks, ML, Bryslawskyj, J, Bumazhnov, V, Campbell, S, Roman, V Canoa, Chen, C-H, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Chujo, T, Citron, Z, Connors, M, Csanád, M, Csörgő, T, Danley, TW, Datta, A, Daugherity, MS, David, G, DeBlasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Dion, A, Diss, PB, H., J, Drees, A, Drees, KA, Durham, JM, Durum, A, Enokizono, A, Esumi, S, Fadem, B, Fan, W, Feege, N, Fields, DE, Finger, M, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Gal, C, Gallus, P, Garg, P, Ge, H, Giordano, F, Glenn, A, Goto, Y, Grau, N, Greene, SV, Perdekamp, M Grosse, Gunji, T, Hachiya, T, Haggerty, JS, Hahn, KI, Hamagaki, H, Hamilton, HF, Han, SY, Hanks, J, Hasegawa, S, Haseler, TOS, Hashimoto, K, He, X, Hemmick, TK, Hill, JC, Hill, K, Hodges, A, Hollis, RS, Homma, K, Hong, B, Hoshino, T, Hotvedt, N, and Huang, J

Subjects
Particle and Plasma Physics, hep-ex, Molecular, Nuclear, nucl-ex, Atomic, Nuclear & Particles Physics
Abstract

We present measurements of elliptic and triangular azimuthal anisotropy of charged particles detected at forward rapidity 1

Published
2019

8. Production of π0 and η mesons in Cu+Au collisions at sNN=200GeV

Author

Aidala, C, Ajitanand, NN, Akiba, Y, Akimoto, R, Alexander, J, Alfred, M, Aoki, K, Apadula, N, Asano, H, Atomssa, ET, Awes, TC, Azmoun, B, Babintsev, V, Bagoly, A, Bai, M, Bai, X, Bannier, B, Barish, KN, Bathe, S, Baublis, V, Baumann, C, Baumgart, S, Bazilevsky, A, Beaumier, M, Belmont, R, Berdnikov, A, Berdnikov, Y, Black, D, Blau, DS, Boer, M, Bok, JS, Boyle, K, Brooks, ML, Bryslawskyj, J, Buesching, H, Bumazhnov, V, Butsyk, S, Campbell, S, Canoa Roman, V, Chen, CH, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Choi, S, Christiansen, P, Chujo, T, Cianciolo, V, Cole, BA, Connors, M, Cronin, N, Crossette, N, Csanád, M, Csörgo, T, Danley, TW, Datta, A, Daugherity, MS, David, G, Deblasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Ding, L, Do, JH, D'Orazio, L, Drapier, O, Drees, A, Drees, KA, Durham, JM, Durum, A, Engelmore, T, Enokizono, A, Esumi, S, Eyser, KO, Fadem, B, Fan, W, Feege, N, Fields, DE, Finger, M, Fleuret, F, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Fukao, Y, Fusayasu, T, Gainey, K, Gal, C, Gallus, P, Garg, P, Garishvili, A, Garishvili, I, Ge, H, Giordano, F, Glenn, A, Gong, X, Gonin, M, and Goto, Y

Subjects
Particle and Plasma Physics, hep-ex, Nuclear Theory, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear Experiment, Atomic, Nuclear & Particles Physics
Abstract

Production of π0 and η mesons has been measured at midrapidity in Cu+Au collisions at sNN=200GeV. Measurements were performed in π0(η)→γγ decay channel in the 1(2)-20GeV/c transverse momentum range. A strong suppression is observed for π0 and η meson production at high transverse momentum in central Cu+Au collisions relative to the p+p results scaled by the number of nucleon-nucleon collisions. In central collisions the suppression is similar to Au+Au with comparable nuclear overlap. The η/π0 ratio measured as a function of transverse momentum is consistent with mT-scaling parametrization down to pT=2GeV/c, its asymptotic value is constant and consistent with Au+Au and p+p and does not show any significant dependence on collision centrality. Similar results were obtained in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions as well as in e+e- collisions in a range of collision energies sNN=3-1800 GeV. This suggests that the quark-gluon-plasma medium produced in Cu+Cu collisions either does not affect the jet fragmentation into light mesons or it affects the π0 and η the same way.

Published
2018

9. Measurement of ϕ-meson production at forward rapidity in p+p collisions at s=510 GeV and its energy dependence from s=200 GeV to 7 TeV

Author

Adare, A, Aidala, C, Ajitanand, NN, Akiba, Y, Akimoto, R, Alfred, M, Apadula, N, Aramaki, Y, Asano, H, Atomssa, ET, Awes, TC, Azmoun, B, Babintsev, V, Bagoly, A, Bai, M, Bandara, NS, Bannier, B, Barish, KN, Bathe, S, Bazilevsky, A, Beaumier, M, Beckman, S, Belmont, R, Berdnikov, A, Berdnikov, Y, Black, D, Boer, M, Bok, JS, Boyle, K, Brooks, ML, Bryslawskyj, J, Buesching, H, Bumazhnov, V, Campbell, S, Roman, V Canoa, Chen, C-H, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Chujo, T, Citron, Z, Connors, M, Csanád, M, Csörgő, T, Danley, TW, Datta, A, Daugherity, MS, David, G, DeBlasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Ding, L, Dion, A, H., J, Drees, A, Drees, KA, Durham, JM, Durum, A, Enokizono, A, En’yo, H, Esumi, S, Fadem, B, Fan, W, Feege, N, Fields, DE, Finger, M, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Fukuda, Y, Gal, C, Gallus, P, Garg, P, Ge, H, Giordano, F, Glenn, A, Goto, Y, Grau, N, Greene, SV, Perdekamp, M Grosse, Gu, Y, Gunji, T, Guragain, H, Hachiya, T, Haggerty, JS, Hahn, KI, Hamagaki, H, Han, SY, Hanks, J, Hasegawa, S, Haseler, TOS, He, X, Hemmick, TK, Hill, JC, and Hill, K

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

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the differential cross section of φ(1020)-meson production at forward rapidity in p+p collisions at s=510 GeV via the dimuon decay channel. The partial cross section in the rapidity and pT ranges 1.2

Published
2018

10. Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at s=200 GeV

Author

Aidala, C, Akiba, Y, Alfred, M, Andrieux, V, Apadula, N, Asano, H, Azmoun, B, Babintsev, V, Bagoly, A, Bandara, NS, Barish, KN, Bathe, S, Bazilevsky, A, Beaumier, M, Belmont, R, Berdnikov, A, Berdnikov, Y, Blau, DS, Boer, M, Bok, JS, Brooks, ML, Bryslawskyj, J, Bumazhnov, V, Campbell, S, Canoa Roman, V, Cervantes, R, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Citron, Z, Connors, M, Cronin, N, Csanád, M, Csörgo, T, Danley, TW, Daugherity, MS, David, G, Deblasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Dion, A, Dixit, D, Do, JH, Drees, A, Drees, KA, Durham, JM, Durum, A, Enokizono, A, En'Yo, H, Esumi, S, Fadem, B, Fan, W, Feege, N, Fields, DE, Finger, M, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Fukuda, Y, Gal, C, Gallus, P, Garg, P, Ge, H, Giordano, F, Goto, Y, Grau, N, Greene, SV, Grosse Perdekamp, M, Gunji, T, Guragain, H, Hachiya, T, Haggerty, JS, Hahn, KI, Hamagaki, H, Hamilton, HF, Han, SY, Hanks, J, Hasegawa, S, Haseler, TOS, He, X, Hemmick, TK, Hill, JC, Hill, K, Hodges, A, Hollis, RS, Homma, K, Hong, B, Hoshino, T, Hotvedt, N, Huang, J, Huang, S, Imai, K, Inaba, M, Iordanova, A, and Isenhower, D

Subjects
Quantum Physics, Particle and Plasma Physics, hep-ex, Molecular, Nuclear, Nuclear Experiment, nucl-ex, Atomic, Nuclear & Particles Physics, Astronomical and Space Sciences
Abstract

Dihadron and isolated direct photon-hadron angular correlations are measured in p+p collisions at s=200 GeV. The correlations are sensitive to nonperturbative initial-state and final-state transverse momenta kT and jT in the azimuthal nearly back-to-back region Δφ∼π. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of pout, the out-of-plane transverse-momentum component perpendicular to the trigger particle, are measured. In this region, the evolution of pout can be studied when several different hard scales are measured. These widths are used to investigate possible effects from transverse-momentum-dependent factorization breaking. When accounting for the longitudinal-momentum fraction of the away-side hadron with respect to the near-side trigger particle, the widths are found to increase with the hard scale; this is qualitatively similar to the observed behavior in Drell-Yan and semi-inclusive deep-inelastic scattering interactions, where factorization is predicted to hold. The momentum widths are also studied as a function of center-of-mass energy by comparing to previous measurements at s=510 GeV. The nonperturbative jet widths also appear to increase with s at a similar xT, which is qualitatively consistent to similar measurements in Drell-Yan interactions. Future detailed global comparisons between measurements of processes where transverse-momentum-dependent factorization is predicted to hold and be broken will provide further insight into the role of color in hadronic interactions.

Published
2018

11. Dielectron production in Au + Au collisions at sNN =200 GeV

Author

Adare, A, Aidala, C, Ajitanand, NN, Akiba, Y, Akimoto, R, Alexander, J, Alfred, M, Al-Ta'ani, H, Angerami, A, Aoki, K, Apadula, N, Aramaki, Y, Asano, H, Aschenauer, EC, Atomssa, ET, Averbeck, R, Awes, TC, Azmoun, B, Babintsev, V, Bai, M, Bandara, NS, Bannier, B, Barish, KN, Bassalleck, B, Bathe, S, Baublis, V, Baumgart, S, Bazilevsky, A, Beaumier, M, Beckman, S, Belmont, R, Berdnikov, A, Berdnikov, Y, Blau, DS, Bok, JS, Boyle, K, Brooks, ML, Bryslawskyj, J, Buesching, H, Bumazhnov, V, Butsyk, S, Campbell, S, Castera, P, Chen, C-H, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Choi, S, Choudhury, RK, Christiansen, P, Chujo, T, Chvala, O, Cianciolo, V, Citron, Z, Cole, BA, Connors, M, Csanád, M, Csörgő, T, Dairaku, S, Danley, TW, Datta, A, Daugherity, MS, David, G, DeBlasio, K, Dehmelt, K, Denisov, A, Deshpande, A, Desmond, EJ, Dharmawardane, KV, Dietzsch, O, Ding, L, Dion, A, Diss, PB, H., J, Donadelli, M, D'Orazio, L, Drapier, O, Drees, A, Drees, KA, Durham, JM, Durum, A, Edwards, S, Efremenko, YV, Engelmore, T, Enokizono, A, Esumi, S, Eyser, KO, Fadem, B, Feege, N, Fields, DE, Finger, M, Fleuret, F, Fokin, SL, Frantz, JE, Franz, A, Frawley, AD, Fukao, Y, and Fusayasu, T

Subjects
Particle and Plasma Physics, Molecular, Nuclear, High Energy Physics::Experiment, Nuclear Experiment, nucl-ex, Atomic, Nuclear & Particles Physics
Abstract

We present measurements of e+e- production at midrapidity in Au+Au collisions at sNN=200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (mee

Published
2016

12. Cross section for bb¯ production via dielectrons in d + Au collisions at sNN=200 GeV

Author

Adare, A, Aidala, C, Ajitanand, NN, Akiba, Y, Al-Bataineh, H, Alexander, J, Angerami, A, Aoki, K, Apadula, N, Aramaki, Y, Atomssa, ET, Averbeck, R, Awes, TC, Azmoun, B, Babintsev, V, Bai, M, Baksay, G, Baksay, L, Barish, KN, Bassalleck, B, Basye, AT, Bathe, S, Baublis, V, Baumann, C, Bazilevsky, A, Belikov, S, Belmont, R, Bennett, R, Bhom, JH, Blau, DS, Bok, JS, Boyle, K, Brooks, ML, Buesching, H, Bumazhnov, V, Bunce, G, Butsyk, S, Campbell, S, Caringi, A, Chen, C-H, Chi, CY, Chiu, M, Choi, IJ, Choi, JB, Choudhury, RK, Christiansen, P, Chujo, T, Chung, P, Chvala, O, Cianciolo, V, Citron, Z, Cole, BA, del Valle, Z Conesa, Connors, M, Csanád, M, Csörgő, T, Dahms, T, Dairaku, S, Danchev, I, Das, K, Datta, A, David, G, Dayananda, MK, Denisov, A, Deshpande, A, Desmond, EJ, Dharmawardane, KV, Dietzsch, O, Dion, A, Donadelli, M, Drapier, O, Drees, A, Drees, KA, Durham, JM, Durum, A, Dutta, D, D'Orazio, L, Edwards, S, Efremenko, YV, Ellinghaus, F, Engelmore, T, Enokizono, A, En'yo, H, Esumi, S, Fadem, B, Fields, DE, Finger, M, Fleuret, F, Fokin, SL, Fraenkel, Z, Frantz, JE, Franz, A, Frawley, AD, Fujiwara, K, Fukao, Y, Fusayasu, T, Garishvili, I, Glenn, A, and Gong, H

Subjects
Particle and Plasma Physics, Molecular, Nuclear, nucl-ex, Atomic, Nuclear & Particles Physics
Abstract

We report a measurement of e+e- pairs from semileptonic heavy-flavor decays in d+Au collisions at sNN=200 GeV. By exploring the mass and transverse-momentum dependence of the yield, the bottom decay contribution can be isolated from charm, and quantified by comparison to pythia and mc@nlo simulations. The resulting bb¯-production cross section is σbb¯dAu=1.37±0.28(stat)±0.46(syst) mb, which is equivalent to a nucleon-nucleon cross section of σbbNN=3.4±0.8(stat)±1.1(syst)μb.

Published
2015

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