SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Boyle K.) ;pers:(Chiu M.);pers:(Horaguchi T.)"

Sökning: WFRF:(Boyle K.) > Chiu M. > Horaguchi T.

  • Resultat 1-10 av 81
  • [1]234567...9Nästa
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Adare, A., et al. (författare)
  • Azimuthal correlations of electrons from heavy-flavor decay with hadrons in p plus p and Au plus Au collisions at root s(NN)=200 GeV
  • 2011
  • Ingår i: Physical Review C. - American Physical Society. - 0556-2813. ; 83:4, s. 044912
  • Tidskriftsartikel (refereegranskat)abstract
    • Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled p+p collisions. These measurements indicate that charm and bottom quarks interact with the hot dense matter produced in heavy-ion collisions much more than expected. Here we extend these studies to two-particle correlations where one particle is an electron from the decay of a heavy-flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interactions between heavy quarks and the matter, such as whether the modification of the away-side-jet shape seen in hadron-hadron correlations is present when the trigger particle is from heavy-meson decay and whether the overall level of away-side-jet suppression is consistent. We statistically subtract correlations of electrons arising from background sources from the inclusive electron-hadron correlations and obtain two-particle azimuthal correlations at root s(NN) = 200 GeV between electrons from heavy-flavor decay with charged hadrons in p+p and also first results in Au+Au collisions. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to p+p collisions.
  •  
2.
  • Adare, A., et al. (författare)
  • Cold-Nuclear-Matter Effects on Heavy-Quark Production at Forward and Backward Rapidity in d + Au Collisions at root s(NN) = GeV
  • 2014
  • Ingår i: Physical Review Letters. - American Physical Society. - 0031-9007. ; 112:25, s. 252301
  • Tidskriftsartikel (refereegranskat)abstract
    • The PHENIX experiment has measured open heavy-flavor production via semileptonic decay over the transverse momentum range 1 < p(T) < 6 GeV/c at forward and backward rapidity (1.4 < vertical bar y vertical bar < 2.0) in d + Au and p + p collisions at root s(NN) = 200 GeV. In central d + Au collisions, relative to the yield in p + p collisions scaled by the number of binary nucleon-nucleon collisions, a suppression is observed at forward rapidity (in the d-going direction) and an enhancement at backward rapidity (in the Au-going direction). Predictions using nuclear-modified-parton-distribution functions, even with additional nuclear-p(T) broadening, cannot simultaneously reproduce the data at both rapidity ranges, which implies that these models are incomplete and suggests the possible importance of final-state interactions in the asymmetric d + Au collision system. These results can be used to probe cold-nuclear-matter effects, which may significantly affect heavy-quark production, in addition to helping constrain the magnitude of charmonia-breakup effects in nuclear matter.
  •  
3.
  • Adare, A., et al. (författare)
  • Spectra and ratios of identified particles in Au plus Au and d plus Au collisions at root s(NN)=200 GeV
  • 2013
  • Ingår i: Physical Review C. - Amer. Physical Soc.. - 0556-2813. ; 88:2, s. 024906
  • Tidskriftsartikel (refereegranskat)abstract
    • The transverse momentum (p(T)) spectra and ratios of identified charged hadrons (pi(+/-), K-+/-, p, (p) over bar) produced in root s(NN) = 200 GeV Au + Au and d + Au collisions are reported in five different centrality classes for each collision species. The measurements of pions and protons are reported up to p(T) = 6 GeV/c (5 GeV/c), and the measurements of kaons are reported up to p(T) = 4 GeV/c (3.5 GeV/c) in Au + Au (d + Au) collisions. In the intermediate p(T) region, between 2 and 5 GeV/c, a significant enhancement of baryon-to-meson ratios compared to those measured in p + p collisions is observed. This enhancement is present in both Au + Au and d + Au collisions and increases as the collisions become more central. We compare a class of peripheral Au + Au collisions with a class of central d + Au collisions which have a comparable number of participating nucleons and binary nucleon-nucleon collisions. The p(T)-dependent particle ratios for these classes display a remarkable similarity, which is then discussed.
  •  
4.
  • Adare, A., et al. (författare)
  • Suppression of away-side jet fragments with respect to the reaction plane in Au plus Au collisions at root s(NN)=200 GeV
  • 2011
  • Ingår i: Physical Review C. - American Physical Society. - 0556-2813. ; 84:2, s. 024904
  • Tidskriftsartikel (refereegranskat)abstract
    • Pair correlations between large transverse momentum neutral pion triggers (p(T) = 4-7 GeV/c) and charged hadron partners (p(T) = 3-7 GeV/c) in central (0%-20%) and midcentral (20%-60%) Au + Au collisions at root s(NN) = 200 GeV are presented as a function of trigger orientation with respect to the reaction plane. The particles are at larger momentum than where jet shape modifications have been observed, and the correlations are sensitive to the energy loss of partons traveling through hot densematter. An out-of-plane trigger particle produces only 26 +/- 20% of the away-side pairs that are observed opposite of an in-plane trigger particle for midcentral (20%-60%) collisions. In contrast, near-side jet fragments are consistent with no suppression or dependence on trigger orientation with respect to the reaction plane. These observations are qualitatively consistent with a picture of little near-side parton energy loss either due to surface bias or fluctuations and increased away-side parton energy loss due to a long path through the medium. The away-side suppression as a function of reaction-plane angle is shown to be sensitive to both the energy loss mechanism and the space-time evolution of heavy-ion collisions.
  •  
5.
  • Adare, A., et al. (författare)
  • Transverse momentum dependence of eta meson suppression in Au plus Au collisions at root s(NN)=200 GeV
  • 2010
  • Ingår i: Physical Review C. - American Physcial Society. - 0556-2813. ; 82:1
  • Tidskriftsartikel (refereegranskat)abstract
    • New measurements by the PHENIX experiment at the Relativistic Heavy Ion Collider for. production at midrapidity as a function of transverse momentum ((PT)) and collision centrality in root s(NN) = 200 GeV Au + Au and p + p collisions are presented. They indicate nuclear modification factors (R-AA) which are similar in both magnitude and trend to those found in earlier pi(0) measurements. Linear fits to R-AA as a function of (PT) in 5-20 GeV/c show that the slope is consistent with zero within two standard deviations at all centralities, although a slow rise cannot be excluded. Having different statistical and systematic uncertainties, the pi(0) and eta measurements are complementary at high (PT); thus, along with the extended (PT) range of these data they can provide additional constraints for theoretical modeling and the extraction of transport properties.
  •  
6.
  • Adare, A., et al. (författare)
  • Cross Section and Parity-Violating Spin Asymmetries of W-+/- Boson Production in Polarized p plus p Collisions at root s=500 Gev
  • 2011
  • Ingår i: Physical Review Letters. - Amer Physical Soc. - 0031-9007. ; 106:6
  • Tidskriftsartikel (refereegranskat)abstract
    • Large parity-violating longitudinal single-spin asymmetries A(L)(e+) = 0.86(-0.14)(+0.30) and Ae(L)(e-) = 0.88(-0.71)(+0.12) are observed for inclusive high transverse momentum electrons and positrons in polarized p + p collisions at a center-of-mass energy of root s = 500 GeV with the PHENIX detector at RHIC. These e(+/-) come mainly from the decay of W-+/- and Z(0) bosons, and their asymmetries directly demonstrate parity violation in the couplings of the W-+/- to the light quarks. The observed electron and positron yields were used to estimate W-+/- boson production cross sections for the e(+/-) channels of sigma(pp -> W+X) X BR(W+ -> e(+) nu(e)) = 144.1 +/- 21.2(stat)(-10.3)(+3.4)(syst) +/- 21.6(norm) pb, and sigma(pp -> W-X) X BR(W- -> e(-) (nu) over bar (e)) = 3.17 +/- 12.1(stat)(-8.2)(+10.1)(syst) +/- 4.8(norm) pb.
  •  
7.
  • Adare, A., et al. (författare)
  • Double-spin asymmetry of electrons from heavy-flavor decays in p plus p collisions at root s=200 GeV
  • 2013
  • Ingår i: Physical Review D. - American Physical Society. - 1550-7998. ; 87:1, s. 012011
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the first measurement of the double-spin asymmetry, A(LL), of electrons from the decays of hadrons containing heavy flavor in longitudinally polarized p + p collisions at root s = 200 GeV for p(T) = 0.5 to 3.0 GeV/c. The asymmetry was measured at midrapidity (vertical bar eta vertical bar < 0.35) with the PHENIX detector at the Relativistic Heavy Ion Collider. The measured asymmetries are consistent with zero within the statistical errors. We obtained a constraint for the polarized gluon distribution in the proton of vertical bar Delta g/g(log(10)(x) = -1.6(-0.4)(+0.5), mu = m(T)(c)vertical bar(2) < 0.030 (1 sigma) based on a leading-order perturbative quantum chromodynamics model, using the measured asymmetry. DOI: 10.1103/PhysRevD.87.012011
  •  
8.
  • Adare, A., et al. (författare)
  • Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in <(p) over right arrow> + <(p) over right arrow> collisions at root s=200 GeV
  • 2014
  • Ingår i: Physical Review D. - Amer. Physical Soc.. - 1550-7998. ; 90:1, s. 012007
  • Tidskriftsartikel (refereegranskat)abstract
    • Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, A(LL), for pi(0) and eta production in root s = 200 GeV polarized p + p collisions. Comparison of the pi(0) results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, Delta G, in the proton in the probed Bjorken x range. The effect of adding the new 2009 pi(0) data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit Delta G(DSSV)(0.05,0.2) = 0.06(-0.15)(+0.11) in the range 0.05 &lt; x &lt; 0.2, with the uncertainty at Delta chi(2) = 9 when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of Delta G(DSSV)(0.05,0.2) between 0.02 and 0.12, demonstrating the need for full treatment of the experimental systematic uncertainties in future global analyses.
  •  
9.
  • Adare, A., et al. (författare)
  • Transition in Yield and Azimuthal Shape Modification in Dihadron Correlations in Relativistic Heavy Ion Collisions
  • 2010
  • Ingår i: Physical Review Letters. - American Physical Society. - 0031-9007. ; 104:25
  • Tidskriftsartikel (refereegranskat)abstract
    • Hard-scattered parton probes produced in collisions of large nuclei indicate large partonic energy loss, possibly with collective produced-medium response to the lost energy. We present measurements of pi(0) trigger particles at transverse momenta p(T)(t) = 4-12 GeV/c and associated charged hadrons (p(T)(a) = 0.5-7 GeV/c) vs relative azimuthal angle Delta phi in Au + Au and p + p collisions at root s(NN) = 200 GeV. The Au + Au distribution at low p(T)(a), whose shape has been interpreted as a medium effect, is modified for p(T)(t) &lt; 7 GeV/c. At higher p(T)(t), the data are consistent with unmodified or very weakly modified shapes, even for the lowest measured p(T)(a), which quantitatively challenges some medium response models. The associated yield of hadrons opposing the trigger particle in Au + Au relative to p + p (I-AA) is suppressed at high p(T) (I-AA approximate to 0.35-0.5), but less than for inclusive suppression (R-AA approximate to 0.2).
  •  
10.
  • Adare, A, et al. (författare)
  • Azimuthal-Angle Dependence of Charged-Pion-Interferometry Measurements with Respect to Second- and Third-Order Event Planes in Au+Au Collisions at sqrts_{NN}=200 GeV.
  • 2014
  • Ingår i: Physical review letters. - American Physical Society. - 0031-9007 .- 1079-7114. ; 112:22, s. 222301
  • Tidskriftsartikel (refereegranskat)abstract
    • Charged-pion-interferometry measurements were made with respect to the second- and third-order event plane for Au+Au collisions at sqrts_{NN}=200 GeV. A strong azimuthal-angle dependence of the extracted Gaussian-source radii was observed with respect to both the second- and third-order event planes. The results for the second-order dependence indicate that the initial eccentricity is reduced during the medium evolution, which is consistent with previous results. In contrast, the results for the third-order dependence indicate that the initial triangular shape is significantly reduced and potentially reversed by the end of the medium evolution, and that the third-order oscillations are largely dominated by the dynamical effects from triangular flow.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 81
  • [1]234567...9Nästa
Åtkomst
fritt online (6)
Typ av publikation
tidskriftsartikel (81)
Typ av innehåll
refereegranskat (81)
Författare/redaktör
Bathe, S. (81)
Buesching, H. (81)
Chujo, T. (81)
Enokizono, A. (81)
Glenn, A. (81)
Esumi, S. (81)
visa fler...
Gunji, T. (81)
Hamagaki, H. (81)
Inaba, M. (81)
Lebedev, A. (81)
Fleuret, F. (81)
Hong, B (81)
Aidala, C (81)
Akiba, Y (81)
Alexander, J (81)
Aoki, K (81)
Azmoun, B (81)
Babintsev, V (81)
Bassalleck, B (81)
Baublis, V (81)
Bazilevsky, A (81)
Boyle, K (81)
Bumazhnov, V (81)
Butsyk, S (81)
Campbell, S (81)
Cianciolo, V (81)
Csanád, M (81)
David, G (81)
Denisov, A (81)
Deshpande, A (81)
Dion, A (81)
Drapier, O (81)
Drees, A (81)
Durum, A (81)
Franz, A (81)
Fukao, Y (81)
Gonin, M (81)
Goto, Y (81)
Grau, N (81)
Hayano, R (81)
He, X (81)
Homma, K (81)
Ichihara, T (81)
Isenhower, D (81)
Issah, M (81)
Jia, J (81)
Jouan, D (81)
Kiss, A (81)
visa färre...
Lärosäte
Lunds universitet (81)
Språk
Engelska (81)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy