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1. Tuning charge-assisted and weak hydrogen bonds in molecular complexes of the proton sponge DMAN by acid co-former substitution

Author

Saunders, LK, Nowell, H, Spencer, HCE, Hatcher, LE, Shepherd, HJ, Thomas, LH, Jones, CL, Teat, SJ, Raithby, PR, and Wilson, CC

Subjects
Bioengineering, Inorganic & Nuclear Chemistry, Physical Chemistry, Materials Engineering, Inorganic Chemistry, Physical Chemistry (incl. Structural)
Abstract

Nine new molecular complexes of the proton sponge 1,8-bis(dimethylamino)naphthalene (DMAN) with substituted benzoic acid co-formers have been engineered with varying component stoichiometries (1:1, 1:2 or 1:3). These complexes are all ionic in nature, following proton transfer between the acid co-former and DMAN; the extracted proton is held by DMAN in all instances in an intramolecular [N-H⋯N]+ hydrogen bond. A number of structural features are common to all complexes and are found to be tunable in a predictable way using systematic acid co-former substitution. These features include charge-assisted hydrogen bonds formed between acid co-formers in hydrogen bonding motifs consistent with complex stoichiometry, and weak hydrogen bonds which facilitate the crystal packing of DMAN and acid co-former components into a regular motif. Possible crystal structure tuning by co-former substitution can aid the rational design of such materials, offering the potential to target solid-state properties that may be influenced by these interactions.

Published
2018

2. Climate Evolution Through the Onset and Intensification of Northern Hemisphere Glaciation

Author

McClymont, EL, Ho, S‐L, Ford, HL, Bailey, I, Berke, MA, Bolton, CT, Schepper, S, Grant, GR, Groeneveld, J, Inglis, GN, Karas, C, Patterson, MO, Swann, GEA, Thirumalai, K, S.M.White, Alonso‐Garcia, M, Anand, P, Hoogakker, BAA, Littler, K, Petrick, BF, Risebrobakken, B, Abell, JT, Crocker, AJ, Graaf, F, Feakins, SJ, Hargreaves, JC, Jones, CL, Markowska, M, Ratnayake, AS, Stepanek, C, Tangunan, D, CEREGE, and Aix Marseille Univ, CNRS, IRD, INRA, Coll France

Subjects
[SDE]Environmental Sciences
Abstract

International audience; The Pliocene Epoch (∼5.3-2.6 million years ago, Ma) was characterized by a warmer than present climate with smaller Northern Hemisphere ice sheets, and offers an example of a climate system in long-term equilibrium with current or predicted near-future atmospheric CO 2 concentrations (pCO 2). A long-term trend of ice-sheet expansion led to more pronounced glacial (cold) stages by the end of the Pliocene (∼2.6 Ma), known as the "intensification of Northern Hemisphere Glaciation" (iNHG). We assessed the spatial and temporal variability of ocean temperatures and ice-volume indicators through the late Pliocene and early Pleistocene (from 3.3 to 2.4 Ma) to determine the character of this climate transition. We identified asynchronous shifts in long-term means and the pacing and amplitude of shorter-term climate variability, between regions and between climate proxies. Early changes in Antarctic glaciation and Southern Hemisphere ocean properties occurred even during the mid-Piacenzian warm period (∼3.264-3.025 Ma) which has been used as an analog for future warming. Increased climate variability subsequently developed alongside signatures of larger Northern Hemisphere ice sheets (iNHG). Yet, some regions of the ocean felt no impact of iNHG, particularly in lower latitudes. Our analysis has demonstrated the complex, non-uniform and globally asynchronous nature of climate changes associated with the iNHG. Shifting ocean gateways and ocean circulation changes may have pre-conditioned the later evolution of ice sheets with falling atmospheric pCO 2. Further development of high-resolution, multi-proxy reconstructions of climate is required so that the full potential of the rich and detailed geological records can be realized. Plain Language Summary Warm climates of the geological past provide windows into future environmental responses to elevated atmospheric CO 2 concentrations, and past climate transitions identify important or sensitive regions and processes. We assessed the patterns of average ocean temperatures and indicators of ice sheet size over hundreds of thousands of years, and compared to shorter-term variability (tens of thousands of years) during a recent transition from late Pliocene warmth (when CO 2 was similar to present) to the onset of the large and repeated advances of northern hemisphere ice sheets referred to as the "ice ages." MCCLYMONT ET AL.

Published
2023

5. Resources and Supplies

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

7. Picture Credits

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

8. About the Authors

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

9. Glossary

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

11. Other problems

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

12. Index

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

13. Cover

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

14. Diseases

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

15. Bad bee behavior

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

16. Troubleshooting

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

17. Pests and predators

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

18. Viruses

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

19. Parasites

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

22. Planting for honey bees

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

23. Hygiene and safety

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

24. Recordkeeping

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

26. Feeding honey bees

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

27. Responsible Beekeeping

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

28. A beekeeper's year

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

29. Maintaining your hive

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

35. Beyond the honey bee

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

37. Honey bee origins

Author

May, Meredith, Rowberry, Anne, Murdin, Margaret, and Jones, Claire

Published
2024

45. The Agewell trial: a pilot randomised controlled trial of a behaviour change intervention to promote healthy ageing and reduce risk of dementia in later life.

Author

Clare, L, Nelis, SM, Jones, IR, Hindle, JV, Thom, JM, Nixon, JA, Cooney, J, Jones, CL, Tudor Edwards, R, Whitaker, CJ, Clare, L, Nelis, SM, Jones, IR, Hindle, JV, Thom, JM, Nixon, JA, Cooney, J, Jones, CL, Tudor Edwards, R, and Whitaker, CJ

Abstract

Background

Lifestyle factors represent prime targets for behaviour change interventions to promote healthy ageing and reduce dementia risk. We evaluated a goal-setting intervention aimed at promoting increased cognitive and physical activity and improving mental and physical fitness, diet and health.

Methods

This was a pilot randomised controlled trial designed to guide planning for a larger-scale investigation, provide preliminary evidence regarding efficacy, and explore feasibility and acceptability. Primary outcomes were engagement in physical and cognitive activity. Participants aged over 50 living independently in the community were recruited through a community Agewell Centre. Following baseline assessment participants were randomly allocated to one of three conditions: control (IC) had an interview in which information about activities and health was discussed; goal-setting (GS n = 24) had an interview in which they set behaviour change goals relating to physical, cognitive and social activity, health and nutrition; and goal-setting with mentoring (GM, n = 24) had the goal-setting interview followed by bi-monthly telephone mentoring. Participants and researchers were blinded to group assignment. Participants were reassessed after 12 months.

Results

Seventy-five participants were randomised (IC n = 27, GS n = 24, GM n = 24). At 12-month follow-up, the two goal-setting groups, taken together (GS n = 21, GM n = 22), increased their level of physical (effect size 0.37) and cognitive (effect size 0.15) activity relative to controls (IC n = 27). In secondary outcomes, the two goal-setting groups taken together achieved additional benefits compared to control (effect sizes ≥ 0.2) in memory, executive function, cholesterol level, aerobic capacity, flexibility, balance, grip strength, and agility. Adding follow-up mentoring produced further benefits compared to goal-setting alone (effect sizes ≥ 0.2) in physical activity, body composition, global

Published
2015

46. Measurement of the Bottom Quark Contribution to Nonphotonic Electron Production in p plus p Collisions at root s=200 GeV

Author

AGGARWAL, MM, AHAMMED, Z, ALAKHVERDYANTS, AV, ALEKSEEV, I, ALFORD, J, ANDERSON, BD, ANSON, D, ARKHIPKIN, D, AVERICHEV, GS, BALEWSKI, J, BARNBY, LS, GHAZIKHANIAN, V, GHOSH, P, GORBUNOV, YN, GORDON, A, GREBENYUK, O, SAKREJDA, I, JONES, PG, JOSEPH, J, JUDD, EG, UNDERWOOD, DG, ZHOU, W, BIELCIKOVA, J, KABANA, S, BELLWIED, R, KAJIMOTO, K, KANG, K, KAPITAN, J, KAUDER, K, SAKUMA, T, KEANE, D, KECHECHYAN, A, ZHU, X, MA, GL, KETTLER, D, KIKOLA, DP, MATULENKO, YA, KIRYLUK, J, KISIEL, A, BETANCOURT, MJ, KIZKA, V, KLEIN, SR, SALUR, S, ZHU, YH, KNOSPE, AG, RAY, RL, KOCOLOSKI, A, KOETKE, DD, KOLLEGGER, T, KONZER, J, MCDONALD, D, KORALT, I, KOROLEVA, L, KORSCH, W, ZOULKARNEEV, R, BETTS, RR, BRIDGEMAN, A, CAINES, H, KOTCHENDA, L, KOUCHPIL, V, KRAVTSOV, P, KRUEGER, K, KRUS, M, KUMAR, L, MCSHANE, TS, ZOULKARNEEVA, Y, KURNADI, P, LAMONT, MAC, LANDGRAF, JM, VAN BUREN, G, SANDWEISS, J, LAPOINTE, S, BHASIN, A, LAURET, J, LEBEDEV, A, LEDNICKY, R, MANGOTRA, LK, LEE, CH, LEE, JH, MESCHANIN, A, LEIGHT, W, VAN LEEUWEN, M, LEVINE, MJ, SANGALINE, E, LI, C, LI, L, LI, N, CHAJECKI, Z, BHATI, AK, LI, W, LI, X, LI, Y, VAN NIEUWENHUIZEN, G, MILNER, R, LI, ZM, LJUBICIC, T, LIN, G, CHALOUPKA, P, LIN, XY, LINDENBAUM, SJ, LISA, MA, LIU, F, BICHSEL, H, LIU, H, VANFOSSEN, JA, MINAEV, NG, MIODUSZEWSKI, S, MISCHKE, A, CHATTOPADHYAY, S, HEINZ, M, MITROVSKI, MK, GUPTA, A, MOHANTY, B, BIRITZ, B, MONDAL, MM, MOROZOV, B, VARMA, R, MOROZOV, DA, MUNHOZ, MG, ROSE, A, NANDI, BK, NATTRASS, C, SCHAMBACH, J, NAYAK, TK, NELSON, JM, GURYN, W, NETRAKANTI, PK, NG, MJ, VASCONCELOS, GMS, BLAND, LC, TRAINOR, TA, NOGACH, LV, NURUSHEV, SB, ODYNIEC, G, OGAWA, A, SCHARENBERG, RP, OKOROKOV, V, OLDAG, EW, OLSON, D, HAAG, B, HOFMAN, DJ, IGO, G, PACHR, M, PAGE, BS, PAL, SK, BONNER, BE, PANDIT, Y, PANEBRATSEV, Y, SCHMITZ, N, PAWLAK, T, PEITZMANN, T, PEREVOZTCHIKOV, V, CHEN, HF, VASILIEV, AN, PERKINS, C, HAMED, A, PERYT, W, PHATAK, SC, PILE, P, PLANINIC, M, BOUCHET, J, SCHUSTER, TR, PLOSKON, MA, CHEN, JH, PLUTA, J, VIDEBAEK, F, PLYKU, D, POLJAK, N, POSKANZER, AM, HAN, LX, POTUKUCHI, BVKS, POWELL, CB, PRINDLE, D, PRUNEAU, C, CHEN, JY, SEELE, J, PRUTHI, NK, REDWINE, R, BRAIDOT, E, PUJAHARI, PR, PUTSCHKE, J, QIU, H, RANIWALA, R, HARRIS, JW, RANIWALA, S, CHENG, J, SEGER, J, SELYUZHENKOV, I, SEYBOTH, P, BIELCIK, J, BRUNA, E, LLOPE, WJ, SHAHALIEV, E, BAUMGART, S, SHAO, M, SHARMA, M, CHERNEY, M, SHI, SS, SICHTERMANN, EP, SIMON, F, SINGARAJU, RN, VIYOGI, YP, SKOBY, MJ, SMIRNOV, N, LONGACRE, RS, SORENSEN, P, BUELTMANN, S, CHIKANIAN, A, HEPPELMANN, S, SOWINSKI, J, SPINKA, HM, SRIVASTAVA, B, STANISLAUS, TDS, VOKAL, S, STASZAK, D, STEVENS, JR, STOCK, R, LOVE, WA, MANWEILER, R, STRIKHANOV, M, STRINGFELLOW, B, SUAIDE, AAP, HIRSCH, A, BUNZAROV, I, SUAREZ, MC, SANCHEZ, MCD, SUBBA, NL, SUMBERA, M, SUN, XM, CHOI, KE, SUN, Y, LU, Y, SUN, Z, SURROW, B, SVIRIDA, DN, SYMONS, TJM, HJORT, E, VOLOSHIN, SA, DE TOLEDO, AS, BURTON, TP, CHRISTIE, W, TAKAHASHI, J, TANG, AH, TANG, Z, LUKASHOV, EV, TARINI, LH, TARNOWSKY, T, THEIN, D, THOMAS, JH, WADA, M, TIAN, J, TRAM, VN, HOFFMAN, AM, TIMMINS, AR, TIMOSHENKO, S, CAI, XZ, TLUSTY, D, LUO, X, TOKAREV, M, WALKER, M, WANG, F, WANG, G, HAYS-WEHLE, JP, HUANG, B, REED, R, WANG, H, GROSNICK, D, WANG, JS, WANG, Q, WANG, XL, WANG, Y, CATU, O, WEBB, G, CHUNG, P, WEBB, JC, WESTFALL, GD, RITTER, HG, WHITTEN, C, HUANG, HZ, MA, YG, WIEMAN, H, WISSINK, SW, WITT, R, WU, YF, CLARKE, RF, XIE, W, XU, H, CEBRA, D, ROBERTS, JB, XU, N, XU, QH, XU, W, MAHAPATRA, DP, HUMANIC, TJ, XU, Y, JACOBS, P, XU, Z, XUE, L, YANG, Y, YEPES, P, BRANDIN, AV, YIP, K, YOO, IK, CENDEJAS, R, YUE, Q, MAJKA, R, CODRINGTON, MJM, ZAWISZA, M, HUO, L, ZBROSZCZYK, H, ZHAN, W, ZHANG, JB, ROGACHEVSKIY, OV, ZHANG, S, ZHANG, WM, ZHANG, XP, ZHANG, Y, CORLISS, R, ZHANG, ZP, MALL, OI, CERVANTES, MC, ZHAO, J, BEAVIS, DR, ZHONG, C, ROMERO, JL, ZHOU, J, CRAMER, JG, CRAWFORD, HJ, DAS, D, MARGETIS, S, TRENTALANGE, S, DASH, S, LIU, J, LEYVA, AD, DE SILVA, LC, DEBBE, RR, DEDOVICH, TG, JACOBS, WW, DEREVSCHIKOV, AA, DE SOUZA, RD, DIDENKO, L, TRIBBLE, RE, DJAWOTHO, P, MARKERT, C, ROY, C, DOGRA, SM, DONG, X, DRACHENBERG, JL, DRAPER, JE, DUNLOP, JC, MAZUMDAR, MRD, JENA, C, TSAI, OD, EFIMOV, LG, ELHALHULI, E, ELNIMR, M, RUAN, L, MASUI, H, ENGELAGE, J, EPPLEY, G, ERAZMUS, B, ESTIENNE, M, EUN, L, HOFFMANN, GW, EVDOKIMOV, O, FACHINI, P, JIN, F, FATEMI, R, SAHOO, R, FEDORISIN, J, MATIS, HS, FERSCH, RG, FILIP, P, FINCH, E, ULERY, J, FINE, V, FISYAK, Y, GAGLIARDI, CA, GANGADHARAN, DR, GANTI, MS, SAKAI, S, JONES, CL, GARCIA-SOLIS, EJ, GUERTIN, SM, GEROMITSOS, A, ULLRICH, T, and GEURTS, F

Subjects
High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment, Tomography
Abstract

The contribution of B meson decays to nonphotonic electrons, which are mainly produced by the semileptonic decays of heavy-flavor mesons, in p + p collisions at root s = 200 GeV has been measured using azimuthal correlations between nonphotonic electrons and hadrons. The extracted B decay contribution is approximately 50% at a transverse momentum of p(T) >= 5 GeV/c. These measurements constrain the nuclear modification factor for electrons from B and D meson decays. The result indicates that B meson production in heavy ion collisions is also suppressed at high p(T).

Published
2010

47. Azimuthal di-hadron correlations in d plus Au and Au plus Au collisions at root s(NN)=200 GeV measured at the STAR detector

Author

AGGARWAL, MM, AHAMMED, Z, ALAKHVERDYANTS, AV, ALEKSEEV, I, ALFORD, J, ANDERSON, BD, ARKHIPKIN, D, AVERICHEV, GS, BALEWSKI, J, BARNBY, LS, BAUMGART, S, ZOULKARNEEVA, Y, CHALOUPKA, P, CHATTOPADHYAY, S, CHEN, HF, CHEN, JH, MARGETIS, S, CHEN, JY, CHENG, J, CHERNEY, M, SAHOO, R, TRIBBLE, RE, HUO, L, CHIKANIAN, A, CHOI, KE, CHRISTIE, W, CHUNG, P, CLARKE, RF, CODRINGTON, MJM, MARKERT, C, CORLISS, R, CRAMER, JG, TSAI, OD, HAYS-WEHLE, JP, CRAWFORD, HJ, DAS, D, IGO, G, DASH, S, LEYVA, AD, DE SILVA, LC, DEBBE, RR, DEDOVICH, TG, MASUI, H, ULERY, J, DEREVSCHIKOV, AA, LJUBICIC, T, DE SOUZA, RD, DIDENKO, L, DJAWOTHO, P, DOGRA, SM, JACOBS, P, DONG, X, DRACHENBERG, JL, DRAPER, JE, ULLRICH, T, DUNLOP, JC, MATIS, HS, SAKAI, S, MAZUMDAR, MRD, EFIMOV, LG, ELHALHULI, E, ELNIMR, M, ENGELAGE, J, EPPLEY, G, JACOBS, WW, UNDERWOOD, DG, ERAZMUS, B, ESTIENNE, M, EUN, L, SAKREJDA, I, MATULENKO, YA, EVDOKIMOV, O, FACHINI, P, FATEMI, R, FEDORISIN, J, FERSCH, RG, HOFFMANN, GW, FILIP, P, FINCH, E, JENA, C, FINE, V, SAKUMA, T, FISYAK, Y, MCDONALD, D, GAGLIARDI, CA, GANGADHARAN, DR, GANTI, MS, VAN BUREN, G, GARCIA-SOLIS, EJ, GEROMITSOS, A, GEURTS, F, GHAZIKHANIAN, V, GHOSH, P, SALUR, S, JIN, F, GORBUNOV, YN, GUPTA, A, GORDON, A, VAN LEEUWEN, M, GREBENYUK, O, GROSNICK, D, JONES, CL, JONES, PG, JOSEPH, J, JUDD, EG, SANDWEISS, J, BETANCOURT, MJ, KABANA, S, KAJIMOTO, K, VAN NIEUWENHUIZEN, G, BIRITZ, B, KANG, K, KAPITAN, J, KAUDER, K, KEANE, D, KECHECHYAN, A, KETTLER, D, SANGALINE, E, KIKOLA, DP, KIRYLUK, J, MAHAPATRA, DP, BETTS, RR, KISIEL, A, MCSHANE, TS, KLEIN, SR, KNOSPE, AG, KOCOLOSKI, A, KOETKE, DD, KOLLEGGER, T, SCHAMBACH, J, KONZER, J, RITTER, HG, KORALT, I, KOROLEVA, L, KORSCH, W, BHASIN, A, MESCHANIN, A, KOTCHENDA, L, KOUCHPIL, V, KRAVTSOV, P, KRUEGER, K, BRUNA, E, SANCHEZ, MCD, KRUS, M, KUMAR, L, KURNADI, P, LAMONT, MAC, LANDGRAF, JM, LAPOINTE, S, MILNER, R, BHATI, AK, LAURET, J, LEBEDEV, A, VANFOSSEN, JA, SCHARENBERG, RP, LEDNICKY, R, LEE, CH, LEE, JH, LEIGHT, W, LEVINE, MJ, LI, C, LI, L, MINAEV, NG, LI, N, VARMA, R, BICHSEL, H, SCHMITZ, N, LI, W, LI, X, LI, Y, LI, ZM, LIN, G, LINDENBAUM, SJ, LISA, MA, VASCONCELOS, GMS, MIODUSZEWSKI, S, LIU, F, LLOPE, WJ, LIU, H, BIELCIK, J, LIU, J, MISCHKE, A, MITROVSKI, MK, MOHANTY, B, MONDAL, MM, VASILIEV, AN, GUPTA, N, MOROZOV, B, BLAND, LC, HEINZ, M, MOROZOV, DA, MUNHOZ, MG, NANDI, BK, NATTRASS, C, NAYAK, TK, NELSON, JM, VIDEBAEK, F, NETRAKANTI, PK, NG, MJ, GURYN, W, NOGACH, LV, SCHUSTER, TR, NURUSHEV, SB, BONNER, BE, ODYNIEC, G, OGAWA, A, OKOROKOV, V, VIYOGI, YP, OLDAG, EW, OLSON, D, PACHR, M, PAGE, BS, HAAG, B, SEELE, J, PAL, SK, PANDIT, Y, PANEBRATSEV, Y, BOUCHET, J, HOFMAN, DJ, PAWLAK, T, PEITZMANN, T, PEREVOZTCHIKOV, V, PERKINS, C, PERYT, W, PHATAK, SC, SEGER, J, HAMED, A, PILE, P, PLANINIC, M, VOKAL, S, PLOSKON, MA, PLUTA, J, BRAIDOT, E, PLYKU, D, POLJAK, N, POSKANZER, AM, POTUKUCHI, BVKS, SELYUZHENKOV, I, POWELL, CB, HAN, LX, VOLOSHIN, SA, PRINDLE, D, PRUNEAU, C, PRUTHI, NK, PUJAHARI, PR, PUTSCHKE, J, BRANDIN, AV, RANIWALA, R, RANIWALA, S, SEYBOTH, P, RAY, RL, ROBERTS, JB, REDWINE, R, HARRIS, JW, REED, R, SHAHALIEV, E, SHAO, M, SHARMA, M, BUELTMANN, S, LONGACRE, RS, SHI, SS, BEAVIS, DR, BIELCIKOVA, J, SICHTERMANN, EP, SIMON, F, SINGARAJU, RN, SKOBY, MJ, SMIRNOV, N, SORENSEN, P, SOWINSKI, J, SPINKA, HM, LOVE, WA, SRIVASTAVA, B, WADA, M, BUNZAROV, I, HEPPELMANN, S, STANISLAUS, TDS, STASZAK, D, STEVENS, JR, STOCK, R, STRIKHANOV, M, STRINGFELLOW, B, SUAIDE, AAP, LU, Y, WALKER, M, SUAREZ, MC, SUBBA, NL, SUMBERA, M, HIRSCH, A, BURTON, TP, SUN, XM, SUN, Y, SUN, Z, SURROW, B, SVIRIDA, DN, CATU, O, LUO, X, SYMONS, TJM, DE TOLEDO, AS, TAKAHASHI, J, TANG, AH, HJORT, E, TANG, Z, CAI, XZ, TARINI, LH, TARNOWSKY, T, WANG, F, THEIN, D, MA, GL, THOMAS, JH, TIAN, J, TIMMINS, AR, TIMOSHENKO, S, TLUSTY, D, HOFFMAN, AM, TOKAREV, M, TRAINOR, TA, WANG, G, CAINES, H, TRAM, VN, MA, YG, TRENTALANGE, S, WANG, H, WANG, JS, WANG, Q, HORNER, MJ, ROGACHEVSKIY, OV, WANG, XL, GUERTIN, SM, WANG, Y, WEBB, G, WEBB, JC, WESTFALL, GD, CEBRA, D, WHITTEN, C, WIEMAN, H, WISSINK, SW, ROMERO, JL, WITT, R, HUANG, B, MAJKA, R, WU, YF, XIE, W, XU, N, XU, QH, XU, W, XU, Y, CENDEJAS, R, ROSE, A, XU, Z, XUE, L, YANG, Y, MALL, OI, HUANG, HZ, YEPES, P, YIP, K, YOO, IK, YUE, Q, ZAWISZA, M, BRIDGEMAN, A, ZBROSZCZYK, H, ZHAN, W, CERVANTES, MC, ZHANG, JB, MANGOTRA, LK, ZHANG, S, HUMANIC, TJ, ZHANG, WM, ZHANG, XP, ZHANG, Y, ROY, C, ZHANG, ZP, ZHAO, J, ZHONG, C, ZHOU, J, ZHOU, W, MANWEILER, R, CHAJECKI, Z, ZHU, X, BELLWIED, R, ZHU, YH, RUAN, L, and ZOULKARNEEV, R

Subjects
Plasma, Radiation, Au+Au Collisions, Nuclear Experiment
Abstract

Yields, correlation shapes, and mean transverse momenta p(T) of charged particles associated with intermediate-to high-p(T) trigger particles (2.5 < p(T) < 10 GeV/c) in d + Au and Au + Au collisions at root s(NN) = 200 GeV are presented. For associated particles at higher p(T) greater than or similar to 2.5 GeV/c, narrow correlation peaks are seen in d + Au and Au + Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle pT < 2 GeV/c, a large enhancement of the near- (Delta phi similar to 0) and away-side (Delta phi similar to pi) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au + Au collisions compared to d + Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at Delta phi similar to pi in central Au + Au collisions.

Published
2010

48. gamma cross section in p plus p collisions at root s=200 GeV

Author

ABELEV, BI, AGGARWAL, MM, AHAMMED, Z, ALAKHVERDYANTS, AV, ANDERSON, BD, ARKHIPKIN, D, AVERICHEV, GS, BALEWSKI, J, BARNBY, LS, BAUMGART, S, BEAVIS, DR, GORDON, A, GREBENYUK, O, JACOBS, WW, JAKL, P, JENA, C, SAKUMA, T, JIN, F, BETTS, RR, JONES, CL, VAN LEEUWEN, M, ZOULKARNEEV, R, BLAND, LC, JONES, PG, JOSEPH, J, JUDD, EG, KABANA, S, KAJIMOTO, K, KANG, K, SALUR, S, KAPITAN, J, KAUDER, K, ZOULKARNEEVA, Y, MA, GL, KEANE, D, BHASIN, A, MATULENKO, YA, KECHECHYAN, A, KETTLER, D, KIKOLA, DP, KIRYLUK, J, KISIEL, A, SANDWEISS, J, CHATTOPADHYAY, S, KNOSPE, AG, REED, R, KOCOLOSKI, A, KOETKE, DD, KOLLEGGER, T, KONZER, J, MCDONALD, D, BHATI, AK, KOPYTINE, M, KORALT, I, CHEN, HF, KORSCH, W, BUELTMANN, S, CATU, O, KOTCHENDA, L, KOUCHPIL, V, KRAVTSOV, P, KRUEGER, K, KRUS, M, KUMAR, L, MCSHANE, TS, CHEN, JH, KURNADI, P, BICHSEL, H, LAMONT, MAC, VAN NIEUWENHUIZEN, G, SANGALINE, E, LANDGRAF, JM, LAPOINTE, S, LAURET, J, LEBEDEV, A, LEDNICKY, R, MANGOTRA, LK, LEE, CH, LEE, JH, MESCHANIN, A, LEIGHT, W, VANFOSSEN, JA, LEVINE, MJ, SCHAMBACH, J, BIELCIK, J, LI, C, LI, L, CHEN, JY, LI, N, LI, W, LI, X, LI, Y, VARMA, R, MILNER, R, LI, Z, LIU, H, LIN, G, CHENG, J, LINDENBAUM, SJ, BIELCIKOVA, J, LISA, MA, MINAEV, NG, MIODUSZEWSKI, S, MISCHKE, A, VASCONCELOS, GMS, MITROVSKI, MK, GUERTIN, SM, MOHANTY, B, CHERNEY, M, HAN, LX, BONNER, BE, MONDAL, MM, MOROZOV, DA, MUNHOZ, MG, NANDI, BK, NATTRASS, C, VASILIEV, AN, NAYAK, TK, NELSON, JM, ROY, C, NETRAKANTI, PK, GUPTA, A, SCHARENBERG, RP, NG, MJ, NOGACH, LV, BOUCHET, J, NURUSHEV, SB, ODYNIEC, G, VIDEBAEK, F, OGAWA, A, TRENTALANGE, S, OKADA, H, OKOROKOV, V, OLSON, D, PACHR, M, SCHMITZ, N, GUPTA, N, PAGE, BS, PAL, SK, PANDIT, Y, HJORT, E, HUANG, HZ, BRAIDOT, E, PANEBRATSEV, Y, PAWLAK, T, PEITZMANN, T, PEREVOZTCHIKOV, V, PERKINS, C, SCHUSTER, TR, PERYT, W, GURYN, W, PHATAK, SC, CHIKANIAN, A, VIYOGI, YP, PILE, P, PLANINIC, M, PLOSKON, MA, BRANDIN, AV, PLUTA, J, PLYKU, D, POLJAK, N, SEELE, J, POSKANZER, AM, CHOI, KE, POTUKUCHI, BVKS, VOKAL, S, HAAG, B, POWELL, CB, PRINDLE, D, PRUNEAU, C, PRUTHI, NK, PUJAHARI, PR, BRIDGEMAN, A, PUTSCHKE, J, CHRISTIE, W, SEGER, J, RANIWALA, R, REHBERG, JM, RANIWALA, S, RAY, RL, HALLMAN, TJ, REDWINE, R, SELYUZHENKOV, I, SEYBOTH, P, SHAHALIEV, E, CHUNG, P, BUNZAROV, I, LIU, J, SHAO, M, BIRITZ, B, BELLWIED, R, SHARMA, M, SHI, SS, SICHTERMANN, EP, SIMON, F, SINGARAJU, RN, CLARKE, RF, SKOBY, MJ, SMIRNOV, N, SORENSEN, P, LJUBICIC, T, VOLOSHIN, SA, SOWINSKI, J, BURTON, TP, HARRIS, JW, SPINKA, HM, SRIVASTAVA, B, CODRINGTON, MJM, STANISLAUS, TDS, STASZAK, D, STEVENS, JR, STOCK, R, STRIKHANOV, M, WADA, M, LLOPE, WJ, STRINGFELLOW, B, SUAIDE, AAP, SUAREZ, MC, MANWEILER, R, HAYS-WEHLE, JP, CAI, XZ, SUBBA, NL, SUMBERA, M, SUN, XM, SUN, Y, CEBRA, D, SUN, Z, LONGACRE, RS, SURROW, B, CORLISS, R, SYMONS, TJM, DE TOLEDO, AS, TAKAHASHI, J, HEINZ, M, TANG, AH, CAINES, H, TANG, Z, WALKER, M, TARINI, LH, TARNOWSKY, T, COSENTINO, MR, LOVE, WA, THEIN, D, THOMAS, JH, TIAN, J, TIMMINS, AR, TIMOSHENKO, S, HEPPELMANN, S, TLUSTY, D, WANG, F, TOKAREV, M, TRIBBLE, RE, SANCHEZ, MCDB, TRAINOR, TA, LU, Y, TRAM, VN, WANG, G, WANG, H, WANG, JS, HOFFMAN, AM, RITTER, HG, WANG, Q, HAMED, A, GROSNICK, D, WANG, XL, WANG, Y, WEBB, G, WEBB, JC, CENDEJAS, R, WESTFALL, GD, WHITTEN, C, WIEMAN, H, ROBERTS, JB, CRAMER, JG, WINGFIELD, E, HOFFMANN, GW, MA, YG, WISSINK, SW, WITT, R, WU, Y, XIE, W, XU, N, XU, QH, CERVANTES, MC, CRAWFORD, HJ, ROGACHEVSKIY, OV, XU, W, XU, Y, XU, Z, MAHAPATRA, DP, HOFMAN, DJ, XUE, L, YANG, Y, YEPES, P, YIP, K, HUMANIC, TJ, YOO, IK, BRUNA, E, YUE, Q, ZAWISZA, M, CHAJECKI, Z, ZBROSZCZYK, H, MAJKA, R, ZHAN, W, HOLLIS, RS, ZHANG, S, DAS, D, ZHANG, WM, ZHANG, XP, ROMERO, JL, ZHANG, Y, ZHANG, ZP, ZHAO, J, ZHONG, C, ZHOU, J, MALL, OI, CHALOUPKA, P, DASH, S, ZHOU, W, BETANCOURT, MJ, ZHU, X, ROSE, A, ZHU, YH, LEYVA, AD, DE SILVA, LC, DEBBE, RR, MARGETIS, S, TSAI, OD, DEDOVICH, TG, LIU, F, DEPHILLIPS, M, DEREVSCHIKOV, AA, DE SOUZA, RD, DIDENKO, L, HUO, L, DJAWOTHO, P, DOGRA, SM, DONG, X, ULERY, J, DRACHENBERG, JL, MARKERT, C, RUAN, L, DRAPER, JE, DUNLOP, JC, MAZUMDAR, MRD, EFIMOV, LG, ELHALHULI, E, ELNIMR, M, IGO, G, ULLRICH, T, ENGELAGE, J, EPPLEY, G, ERAZMUS, B, SAHOO, R, MASUI, H, ESTIENNE, M, EUN, L, EVDOKIMOV, O, FACHINI, P, FATEMI, R, HIRSCH, A, FEDORISIN, J, FERSCH, RG, IORDANOVA, A, FILIP, P, SAKAI, S, FINCH, E, MATIS, HS, FINE, V, FISYAK, Y, GAGLIARDI, CA, UNDERWOOD, DG, GANGADHARAN, DR, GANTI, MS, GARCIA-SOLIS, EJ, GEROMITSOS, A, GEURTS, F, SAKREJDA, I, JACOBS, P, GHAZIKHANIAN, V, GRUBE, B, GHOSH, P, VAN BUREN, G, and GORBUNOV, YN

Subjects
Suppression, Nucleus-Nucleus Collisions, Resonances, Quark-Gluon Plasma, High Energy Physics::Experiment, J-Psi, Nuclear Experiment, Dimuon
Abstract

We report on a measurement of the gamma(1S + 2S + 3S) -> e(+)e(-) cross section at midrapidity in p + p collisions at root s = 200 GeV. We find the cross section to be 114 +/- 38(stat + fit)(-24)(+23)(syst) pb. Perturbative QCD calculations at next-to-leading order in the color evaporation model are in agreement with our measurement, while calculations in the color singlet model underestimate it by 2 sigma. Our result is consistent with the trend seen in world data as a function of the center-of-mass energy of the collision and extends the availability of gamma data to RHIC energies. The dielectron continuum in the invariant-mass range near the gamma is also studied to obtain a combined yield of e(+)e(-) pairs from the sum of the Drell-Yan process and b-(b) over bar production.

Published
2010

49. Inclusive pi(0), eta, and direct photon production at high transverse momentum in p plus p and d plus Au collisions at root s(NN)=200 GeV

Author

ABELEV, BI, AGGARWAL, MM, AHAMMED, Z, ALAKHVERDYANTS, AV, ANDERSON, BD, ARKHIPKIN, D, AVERICHEV, GS, BALEWSKI, J, BARANNIKOVA, O, BARNBY, LS, BAUMGART, S, LISA, MA, LIU, F, LIU, H, LIU, J, LJUBICIC, T, LLOPE, WJ, LONGACRE, RS, LOVE, WA, LU, Y, BIELCIK, J, GROSNICK, D, MA, GL, MA, YG, MAHAPATRA, DP, MAJKA, R, MALL, OI, MANGOTRA, LK, MANWEILER, R, MARGETIS, S, MARKERT, C, MASUI, H, GRUBE, B, BIELCIKOVA, J, MATIS, HS, MATULENKO, YA, MCDONALD, D, MCSHANE, TS, MESCHANIN, A, MILNER, R, MINAEV, NG, MIODUSZEWSKI, S, MISCHKE, A, GUERTIN, SM, MITROVSKI, MK, BIRITZ, B, MOHANTY, B, MONDAL, MM, MOROZOV, DA, MUNHOZ, MG, NANDI, BK, NATTRASS, C, NAYAK, TK, NELSON, JM, GUPTA, A, NETRAKANTI, PK, NG, MJ, BLAND, LC, NOGACH, LV, NURUSHEV, SB, ODYNIEC, G, OGAWA, A, OKADA, H, OKOROKOV, V, OLSON, D, GUPTA, N, PACHR, M, PAGE, BS, PAL, SK, BONNER, BE, PANDIT, Y, PANEBRATSEV, Y, PAWLAK, T, PEITZMANN, T, PEREVOZTCHIKOV, V, PERKINS, C, GURYN, W, PERYT, W, PHATAK, SC, PILE, P, PLANINIC, M, BOUCHET, J, PLOSKON, MA, PLUTA, J, PLYKU, D, POLJAK, N, POSKANZER, AM, HAAG, B, POTUKUCHI, BVKS, POWELL, CB, PRINDLE, D, PRUNEAU, C, PRUTHI, NK, BRAIDOT, E, PUJAHARI, PR, PUTSCHKE, J, RANIWALA, R, RANIWALA, S, HALLMAN, TJ, RAY, RL, REDWINE, R, REED, R, REHBERG, JM, RITTER, HG, ROBERTS, JB, BRANDIN, AV, ROGACHEVSKIY, OV, ROMERO, JL, ROSE, A, HAMED, A, ROY, C, RUAN, L, RUSSCHER, MJ, SAHOO, R, SAKAI, S, SAKREJDA, I, SAKUMA, T, BRIDGEMAN, A, SALUR, S, SANDWEISS, J, HAN, LX, SANGALINE, E, SCHAMBACH, J, SCHARENBERG, RP, SCHMITZ, N, SCHUSTER, TR, SEELE, J, SEGER, J, SELYUZHENKOV, I, BRUNA, E, SEYBOTH, P, BEAVIS, DR, SHAHALIEV, E, SHAO, M, SHARMA, M, SHI, SS, SICHTERMANN, EP, SIMON, F, SINGARAJU, RN, SKOBY, MJ, SMIRNOV, N, BUELTMANN, S, HARRIS, JW, SORENSEN, P, SOWINSKI, J, SPINKA, HM, SRIVASTAVA, B, STANISLAUS, TDS, STASZAK, D, STEVENS, JR, STOCK, R, STRIKHANOV, M, STRINGFELLOW, B, HAYS-WEHLE, JP, BUNZAROV, I, SUAIDE, AAP, SUAREZ, MC, SUBBA, NL, SUMBERA, M, SUN, XM, SUN, Y, SUN, Z, SURROW, B, SYMONS, TJM, HEINZ, M, DE TOLEDO, AS, BURTON, TP, TAKAHASHI, J, TANG, AH, TANG, Z, TARINI, LH, TARNOWSKY, T, THEIN, D, THOMAS, JH, TIAN, J, HEPPELMANN, S, TIMMINS, AR, TIMOSHENKO, S, CAI, XZ, TLUSTY, D, TOKAREV, M, TRAINOR, TA, TRAM, VN, TRENTALANGE, S, TRIBBLE, RE, TSAI, OD, HIRSCH, A, ULERY, J, ULLRICH, T, UNDERWOOD, DG, CAINES, H, VAN BUREN, G, VAN NIEUWENHUIZEN, G, VANFOSSEN, JA, VARMA, R, VASCONCELOS, GMS, VASILIEV, AN, HJORT, E, VIDEBAEK, F, VIYOGI, YP, VOKAL, S, VOLOSHIN, SA, SANCHEZ, MCD, WADA, M, WALKER, M, WANG, F, WANG, G, WANG, H, HOFFMAN, AM, WANG, JS, WANG, Q, WANG, X, WANG, XL, WANG, Y, CATU, O, WEBB, G, WEBB, JC, WESTFALL, GD, WHITTEN, C, HOFFMANN, GW, WIEMAN, H, WINGFIELD, E, WISSINK, SW, WITT, R, WU, Y, XIE, W, CEBRA, D, XU, N, XU, QH, XU, W, HOFMAN, DJ, XU, Y, XU, Z, XUE, L, YANG, Y, YEPES, P, YIP, K, YOO, IK, CENDEJAS, R, YUE, Q, ZAWISZA, M, HOLLIS, RS, ZBROSZCZYK, H, ZHAN, W, ZHANG, S, ZHANG, WM, ZHANG, XP, ZHANG, Y, ZHANG, ZP, ZHAO, J, CERVANTES, MC, ZHONG, C, BELLWIED, R, ZHOU, J, ZHOU, W, ZHU, X, ZHU, YH, ZOULKARNEEV, R, ZOULKARNEEVA, Y, CHAJECKI, Z, CHALOUPKA, P, CHATTOPADHYAY, S, CHEN, HF, HUANG, HZ, CHEN, JH, CHEN, JY, CHENG, J, CHERNEY, M, CHIKANIAN, A, CHOI, KE, CHRISTIE, W, CHUNG, P, CLARKE, RF, CODRINGTON, MJM, HUMANIC, TJ, CORLISS, R, CRAMER, JG, CRAWFORD, HJ, DAS, D, DASH, S, LEYVA, AD, DE SILVA, LC, DEBBE, RR, DEDOVICH, TG, DEPHILLIPS, M, HUO, L, DEREVSCHIKOV, AA, DE SOUZA, RD, DIDENKO, L, DJAWOTHO, P, DOGRA, SM, DONG, X, DRACHENBERG, JL, DRAPER, JE, DUNLOP, JC, MAZUMDAR, MRD, IGO, G, EFIMOV, LG, ELHALHULI, E, ELNIMR, M, ENGELAGE, J, EPPLEY, G, ERAZMUS, B, ESTIENNE, M, EUN, L, FACHINI, P, FATEMI, R, IORDANOVA, A, FEDORISIN, J, FERSCH, RG, FILIP, P, FINCH, E, FINE, V, FISYAK, Y, GAGLIARDI, CA, GANGADHARAN, DR, GANTI, MS, GARCIA-SOLIS, EJ, JACOBS, P, GEROMITSOS, A, GEURTS, F, GHAZIKHANIAN, V, GHOSH, P, GORBUNOV, YN, GORDON, A, GREBENYUK, O, JACOBS, WW, JAKL, P, JENA, C, JIN, F, BENEDOSSO, F, JONES, CL, JONES, PG, JOSEPH, J, JUDD, EG, KABANA, S, KAJIMOTO, K, KANG, K, KAPITAN, J, KAUDER, K, KEANE, D, BETANCOURT, MJ, KECHECHYAN, A, KETTLER, D, KIKOLA, DP, KIRYLUK, J, KISIEL, A, KLEIN, SR, KNOSPE, AG, KOCOLOSKI, A, KOETKE, DD, KOLLEGGER, T, BETTS, RR, KONZER, J, KOPYTINE, M, KORALT, I, KORSCH, W, KOTCHENDA, L, KOUCHPIL, V, KRAVTSOV, P, KRUEGER, K, KRUS, M, KUMAR, L, BHASIN, A, KURNADI, P, LAMONT, MAC, LANDGRAF, JM, LAPOINTE, S, LAURET, J, LEBEDEV, A, LEDNICKY, R, LEE, CH, LEE, JH, LEIGHT, W, BHATI, AK, LEVINE, MJ, LI, C, LI, L, LI, N, LI, W, LI, X, LI, Y, LI, Z, LIN, G, BICHSEL, H, and LINDENBAUM, SJ

Subjects
D+Au Collisions, Barrel Electromagnetic Calorimeter, Star, Fragmentation, Physics, Time Projection Chamber, Heavy-Ion Collisions, Distributions, High Energy Physics::Experiment, Leading Order, Hadron-Production, Nuclear Experiment
Abstract

We report a measurement of high-p(T) inclusive pi(0), eta, and direct photon production in p + p and d + Au collisions at root s(NN) = 200 GeV at midrapidity (0 < eta < 1). Photons from the decay pi(0) -> gamma gamma were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The eta -> gamma gamma decay was also observed and constituted the first eta measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the pi(0), eta, and omega(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations.

Published
2010

50. Charged and strange hadron elliptic flow in Cu plus Cu collisions at root s(NN)=62.4 and 200 GeV

Author

ABELEV, BI, AGGARWAL, MM, AHAMMED, Z, ALAKHVERDYANTS, AV, ALEKSEEV, I, ANDERSON, BD, ARKHIPKIN, D, AVERICHEV, GS, BALEWSKI, J, BARNBY, LS, BAUMGART, S, GARCIA-SOLIS, EJ, GRUBE, B, GEROMITSOS, A, ULERY, J, GEURTS, F, BEAVIS, DR, BETTS, RR, KETTLER, D, KIKOLA, DP, WANG, F, ZHAO, J, ROMERO, JL, SAKUMA, T, ZHU, YH, KIRYLUK, J, RAY, RL, KISIEL, A, KLEIN, SR, SHAHALIEV, E, KNOSPE, AG, KOCOLOSKI, A, BELLWIED, R, MIODUSZEWSKI, S, MATULENKO, YA, KOETKE, DD, MUNHOZ, MG, KOLLEGGER, T, KONZER, J, ZOULKARNEEV, R, BHASIN, A, BRUNA, E, SHAO, M, ZHONG, C, SANCHEZ, MCD, PUJAHARI, PR, KOPYTINE, M, KORALT, I, KOROLEVA, L, KORSCH, W, NANDI, BK, KOTCHENDA, L, KOUCHPIL, V, MCDONALD, D, ROGACHEVSKIY, OV, ZOULKARNEEVA, Y, CHIKANIAN, A, HAN, LX, KRAVTSOV, P, KRUEGER, K, KRUS, M, UNDERWOOD, DG, SALUR, S, KUMAR, L, SANGALINE, E, ZHOU, J, BHATI, AK, KURNADI, P, LAMONT, MAC, HOFFMANN, GW, SHARMA, M, LANDGRAF, JM, MALL, OI, LAPOINTE, S, LAURET, J, MCSHANE, TS, BLAND, LC, LEBEDEV, A, VAN BUREN, G, NATTRASS, C, LEDNICKY, R, REED, R, SANDWEISS, J, SHI, SS, LEE, CH, LEE, JH, LEIGHT, W, CRAWFORD, HJ, CHALOUPKA, P, BICHSEL, H, LEVINE, MJ, LI, C, LI, L, WANG, G, NAYAK, TK, LI, N, LI, Z, VAN LEEUWEN, M, DAS, D, MESCHANIN, A, LI, W, LIU, F, LI, X, CHATTOPADHYAY, S, GROSNICK, D, GUPTA, A, NELSON, JM, NETRAKANTI, PK, DASH, S, ULLRICH, T, VARMA, R, GORBUNOV, YN, BONNER, BE, TLUSTY, D, NG, MJ, NOGACH, LV, WANG, H, NURUSHEV, SB, ODYNIEC, G, SELYUZHENKOV, I, SCHAMBACH, J, OGAWA, A, SHI, XH, OKADA, H, OKOROKOV, V, GORDON, A, GUPTA, N, HOFFMAN, AM, WANG, JS, HUMANIC, TJ, TIAN, J, OLSON, D, PACHR, M, PAGE, BS, BOUCHET, J, SICHTERMANN, EP, PAL, SK, PANDIT, Y, SCHARENBERG, RP, GREBENYUK, O, JUDD, EG, LU, Y, PANEBRATSEV, Y, PAWLAK, T, PEITZMANN, T, CHEN, JH, VASCONCELOS, GMS, PEREVOZTCHIKOV, V, VIDEBAEK, F, GURYN, W, PERKINS, C, PERYT, W, MANWEILER, R, WANG, Q, PHATAK, SC, SAKAI, S, PILE, P, BRAIDOT, E, SCHMITZ, N, PLANINIC, M, CHEN, JY, SIMON, F, PLOSKON, MA, TRAM, VN, VASILIEV, AN, WANG, XL, PLUTA, J, PLYKU, D, POLJAK, N, JAKL, P, HAAG, B, POSKANZER, AM, POTUKUCHI, BVKS, POWELL, CB, LEYVA, AD, SINGARAJU, RN, PRINDLE, D, PUTSCHKE, J, CHENG, J, SCHUSTER, TR, PRUNEAU, C, REDWINE, R, BRANDIN, AV, JENA, C, PRUTHI, NK, LISA, MA, LIU, J, SKOBY, MJ, BUNZAROV, I, CHEN, HF, CHOI, KE, LIN, G, HAYS-WEHLE, JP, ZHOU, W, SMIRNOV, N, SORENSEN, P, DE SILVA, LC, SOWINSKI, J, SPINKA, HM, VIYOGI, YP, SRIVASTAVA, B, CEBRA, D, STANISLAUS, TDS, STASZAK, D, BIELCIK, J, LJUBICIC, T, MANGOTRA, LK, DEBBE, RR, BIRITZ, B, STEVENS, JR, STOCK, R, STRIKHANOV, M, HEINZ, M, WANG, Y, BURTON, TP, STRINGFELLOW, B, CATU, O, LINDENBAUM, SJ, MOHANTY, B, SUAIDE, AAP, SUAREZ, MC, SUBBA, NL, JONES, CL, CHRISTIE, W, SUMBERA, M, CLARKE, RF, LLOPE, WJ, SUN, XM, SUN, Y, DEDOVICH, TG, SUN, Z, VAN NIEUWENHUIZEN, G, SURROW, B, HEPPELMANN, S, VOKAL, S, SVIRIDA, DN, BETANCOURT, MJ, WEBB, G, CAI, XZ, CHUNG, P, DEPHILLIPS, M, SYMONS, TJM, DE TOLEDO, AS, TAKAHASHI, J, MILNER, R, LONGACRE, RS, TANG, AH, TANG, Z, TARINI, LH, WEBB, JC, TARNOWSKY, T, CAINES, H, JONES, PG, VOLOSHIN, SA, THEIN, D, TOKAREV, M, HIRSCH, A, MINAEV, NG, THOMAS, JH, REHBERG, JM, WESTFALL, GD, HOFMAN, DJ, JIN, F, KABANA, S, RANIWALA, R, MA, GL, GHAZIKHANIAN, V, WHITTEN, C, WIEMAN, H, WINGFIELD, E, WISSINK, SW, CODRINGTON, MJM, WITT, R, IGO, G, WU, Y, CENDEJAS, R, HAMED, A, RITTER, HG, SAKREJDA, I, HARRIS, JW, XIE, W, XU, N, XU, QH, MA, YG, DEREVSCHIKOV, AA, HOLLIS, RS, XU, W, HUO, L, RANIWALA, S, XU, Y, XU, Z, XUE, L, MISCHKE, A, KAJIMOTO, K, YANG, Y, KAPITAN, J, BRIDGEMAN, A, YEPES, P, YIP, K, CERVANTES, MC, CHERNEY, M, YOO, IK, MAHAPATRA, DP, CORLISS, R, YUE, Q, GUERTIN, SM, DE SOUZA, RD, HUANG, HZ, KANG, K, ZAWISZA, M, ZBROSZCZYK, H, ZHAN, W, SEELE, J, ROBERTS, JB, ZHANG, S, ZHANG, WM, ZHANG, XP, DIDENKO, L, ZHANG, Y, MITROVSKI, MK, CRAMER, JG, ZHANG, ZP, ZHU, X, MAJKA, R, SEGER, J, CHAJECKI, Z, TRENTALANGE, S, DJAWOTHO, P, MARGETIS, S, MONDAL, MM, TIMMINS, AR, ROSE, A, LI, Y, DOGRA, SM, DONG, X, DRACHENBERG, JL, DRAPER, JE, KAUDER, K, DUNLOP, JC, MAZUMDAR, MRD, IORDANOVA, A, LOVE, WA, TRIBBLE, RE, VANFOSSEN, JA, BIELCIKOVA, J, EFIMOV, LG, ELHALHULI, E, ELNIMR, M, ROY, C, MARKERT, C, ENGELAGE, J, MATIS, HS, TIMOSHENKO, S, EPPLEY, G, ERAZMUS, B, ESTIENNE, M, BUELTMANN, S, MOROZOV, B, EUN, L, HJORT, E, EVDOKIMOV, O, FACHINI, P, JACOBS, P, JOSEPH, J, FATEMI, R, RUAN, L, KEANE, D, FEDORISIN, J, LIU, H, MASUI, H, MOROZOV, DA, FERSCH, RG, FILIP, P, FINCH, E, WADA, M, TSAI, OD, FINE, V, FISYAK, Y, GAGLIARDI, CA, GANGADHARAN, DR, SEYBOTH, P, KECHECHYAN, A, GANTI, MS, GHOSH, P, SAHOO, R, WALKER, M, and JACOBS, WW

Subjects
Phi-Meson Production, Centrality Dependence, Star, Quark-Gluon Plasma, Heavy-Ion Collisions, High Energy Physics::Experiment, Phase-Transition, Relativistic Nuclear Collisions, Nuclear Experiment, Signature, Collaboration, Anisotropic Flow
Abstract

We present the results of an elliptic flow, v(2), analysis of Cu + Cu collisions recorded with the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider at root s(NN) = 62.4 and 200 GeV. Elliptic flow as a function of transverse momentum, v(2)(p(T)), is reported for different collision centralities for charged hadrons h(+/-) and strangeness-ontaining hadrons K-S(0), Lambda, Xi, and phi in the midrapidity region vertical bar eta vertical bar < 1.0. Significant reduction in systematic uncertainty of the measurement due to nonflow effects has been achieved by correlating particles at midrapidity, vertical bar eta vertical bar < 1.0, with those at forward rapidity, 2.5 < vertical bar eta vertical bar < 4.0. We also present azimuthal correlations in p + p collisions at root s = 200 GeV to help in estimating nonflow effects. To study the system-size dependence of elliptic flow, we present a detailed comparison with previously published results from Au + Au collisions at root s(NN) = 200 GeV. We observe that v(2)(p(T)) of strange hadrons has similar scaling properties as were first observed in Au + Au collisions, that is, (i) at low transverse momenta, p(T) < 2 GeV/c, v(2) scales with transverse kinetic energy, m(T) - m, and (ii) at intermediate p(T), 2 < p(T) < 4 GeV/c, it scales with the number of constituent quarks, n(q.) We have found that ideal hydrodynamic calculations fail to reproduce the centrality dependence of v(2)(p(T)) for K-S(0) and Lambda. Eccentricity scaled v(2) values, v(2)/epsilon, are larger in more central collisions, suggesting stronger collective flow develops in more central collisions. The comparison with Au + Au collisions, which go further in density, shows that v(2)/epsilon depends on the system size, that is, the number of participants N-part. This indicates that the ideal hydrodynamic limit is not reached in Cu + Cu collisions, presumably because the assumption of thermalization is not attained.

Published
2010

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