A Method for Measuring Event-by-Event Elliptic Flow Fluctuations with the First-Order Event Plane in Heavy-Ion Collisions

  • A new method is presented for measuring event-by-event fluctuations of elliptic flow (v2) using first-order event planes. By studying the event-by-event distributions of v2 observables and first-order event-plane observables, average flow 〈v2〉and event-by-event fluctuations with respect to that average can be separately determined, making appropriate allowance for the effects of finite multiplicity. The relation of flow fluctuations to eccentricity fluctuations in the initial-state participant region, as well as detector acceptance effects, are discussed.
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  • [1] . Voloshin S, ZHANG Y. Z. Phys., 1996, C70: 665;Poskanzer A M, Voloshin S A. Phys. Rev., 1998, C58: 16712. Adler C et al. (STAR Collaboration). Phys. Rev., 2002,C66: 0349043. Adams J et al. (STAR Collaboration). Phys. Rev., 2005,C72: 0149044. Miller M, Snellings R. preprint nucl-ex/03120085. Alver B et al. (PHOBOS Collaboration). preprint nucl-ex/06080256. WANG G, TANG A H, Keane D et al. preprint nucl-ex/06110017. Adler C et al. Nucl. Instrum. Methods, 2001, A470: 488;The STAR ZDC-SMD has the same structure as the STAR EEMC SMD: Allgower C E et al. Nucl. Instrum. Methods,2003, A499: 740; Nucl. Instrum. Methods, 2003, A499:7138. Adams J et al. (STAR Collaboration). Phys. Rev., 2006,C73: 0349039. Fraser D A S. Statistics: An Introduction. New York: JohnWiley, 196010. Back B B et al. Phys. Rev., 2002, C65: 031901; AdcoxK et al. Phys. Rev. Lett., 2001, 86: 3500; Bearden I G etal. Phys. Lett., 2001, B523: 227; Adams J et al. (STAR Collaboration). Phys. Rev., 2004 C70: 054907
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WANG Gang, Declan Keane, Aihong Tang and Sergei A. A Method for Measuring Event-by-Event Elliptic Flow Fluctuations with the First-Order Event Plane in Heavy-Ion Collisions[J]. Chinese Physics C, 2007, 31(12): 1165-1169.
WANG Gang, Declan Keane, Aihong Tang and Sergei A. A Method for Measuring Event-by-Event Elliptic Flow Fluctuations with the First-Order Event Plane in Heavy-Ion Collisions[J]. Chinese Physics C, 2007, 31(12): 1165-1169. shu
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Received: 2007-07-17
Revised: 1900-01-01
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A Method for Measuring Event-by-Event Elliptic Flow Fluctuations with the First-Order Event Plane in Heavy-Ion Collisions

  • University of California, Los Angeles, California 90095, USA2 Kent State University,Kent, Ohio 44242, USA3 Brookhaven National Laboratory, Upton, New York 11973, USA4 Wayne State University, Detroit, Michigan 48201, USA

Abstract: A new method is presented for measuring event-by-event fluctuations of elliptic flow (v2) using first-order event planes. By studying the event-by-event distributions of v2 observables and first-order event-plane observables, average flow 〈v2〉and event-by-event fluctuations with respect to that average can be separately determined, making appropriate allowance for the effects of finite multiplicity. The relation of flow fluctuations to eccentricity fluctuations in the initial-state participant region, as well as detector acceptance effects, are discussed.

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