Персона:
Блау, Дмитрий Сергеевич

Научные группы

Научная группа

CBM Collaboration

Научная группа

PHENIX Collaboration

Организационные подразделения

Организационная единица

Институт ядерной физики и технологий

Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.

Фамилия

Блау

Имя

Дмитрий Сергеевич

Полная страница элемента

Результаты поиска

Теперь показываю 1 - 10 из 53

Только метаданные
Measurement of charm and bottom production from semileptonic hadron decays in p plus p collisions at root s=200 GeV
(2019) Aidala, C.; Akiba, Y.; Alfred, M.; Andrieux, V.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
Measurements of the differential production of electrons from open-heavy-flavor hadrons with charm-and bottom-quark content in p + p collisions at root 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.
Только метаданные
Transverse single spin asymmetries of forward neutrons in p+p, p+Al, and p+Au collisions at sNN =200 GeV as a function of transverse and longitudinal momenta
(2022) Acharya, U. A.; Aidala, C.; Akiba, Y.; Alfred, M.; Blau, D.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
© 2022 authors. Published by the American Physical Society.In 2015 the PHENIX collaboration at the Relativistic Heavy Ion Collider recorded p+p, p+Al, and p+Au collision data at center of mass energies of sNN=200 GeV with the proton beam(s) transversely polarized. At very forward rapidities η>6.8 relative to the polarized proton beam, neutrons were detected either inclusively or in (anti)correlation with detector activity related to hard collisions. The resulting single spin asymmetries, that were previously reported, have now been extracted as a function of the transverse momentum of the neutron as well as its longitudinal momentum fraction xF. The explicit kinematic dependence, combined with the correlation information allows for a closer look at the interplay of different mechanisms suggested to describe these asymmetries, such as hadronic interactions or electromagnetic interactions in ultraperipheral collisions, UPC. Events that are correlated with a hard collision indeed display a mostly negative asymmetry that increases in magnitude as a function of transverse momentum with only little dependence on xF. In contrast, events that are not likely to have emerged from a hard collision display positive asymmetries for the nuclear collisions with a kinematic dependence that resembles that of a UPC based model. Because the UPC interaction depends strongly on the charge of the nucleus, those effects are very small for p+p collisions, moderate for p+Al collisions, and large for p+Au collisions.
Только метаданные
Measurements of charm, bottom, and Drell-Yan via dimuons in p plus p and p plus Au collisions at root S-NN=200 GeV with PHENIX at RHIC
(2019) Leung, Y. H.; Adare, A.; Afanasiev, S.; Aidala, C.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
Dilepton spectra are a classic probe to study ultra-relativistic heavy ion collisions. At RHIC energies, the dimuon continuum is dominated by correlated pairs from semi-leptonic decays of charm and bottom hadrons and the Drell-Yan process. The dimuon spectra contain information on heavy flavor angular correlations, which can constrain the relative contributions from different heavy flavor production mechanisms. Studying heavy flavor correlations in p+Au collisions may provide further insight on cold nuclear matter effects. Measurements of the Drell-Yan cross-section can provide constraints to PDFs, as well as further our understanding in initial state interactions in p+Au collisions. In this talk, we report measurements of pp pairs from charm, bottom, and Drell-Yan in p+p and p+Au collisions at root S-NN = 200 GeV. A further shape analysis is applied to the heavy flavor pair correlations to extract the relative contributions to heavy flavor production mechanisms.
Только метаданные
Transverse-single-spin asymmetries of charged pions at midrapidity in transversely polarized p+p collisions at s=200 GeV
(2022) Acharya, U. A.; Aidala, C.; Akiba, Y.; Alfred, M.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
© 2022 authors. Published by the American Physical Society.In 2015, the PHENIX Collaboration has measured single-spin asymmetries for charged pions in transversely polarized p+p collisions at the center-of-mass energy of s=200 GeV. The pions were detected at central rapidities of |η|<0.35. The single-spin asymmetries are consistent with zero for each charge individually, as well as consistent with the previously published neutral-pion asymmetries in the same rapidity range. However, they show a slight indication of charge-dependent differences which may suggest a flavor dependence in the underlying mechanisms that create these asymmetries.
Только метаданные
Nonprompt direct-photon production in Au+Au collisions at sNN =200 GeV
(2024) Abdulameer, N. J.; Acharya, U.; Adare, A.; Aidala, C.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
Только метаданные
Nuclear-modification factor of charged hadrons at forward and backward rapidity in p plus Al and p plus Au collisions at root S-NN=200 GeV
(2020) Aidala, C.; Akiba, Y.; Alfred, M.; Andrieux, V.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
The PHENIX experiment has studied nuclear effects in p + Al and p + Au collisions at root S-NN = 200GeV on charged hadron production at forward rapidity (1.4 < eta < 2.4, p-going direction) and backward rapidity (-2.2 < eta < -1.2, A-going direction). Such effects are quantified by measuring nuclear modification factors as a function of transverse momentum and pseudorapidity in various collision multiplicity selections. In central p + Al and p + Au collisions, a suppression (enhancement) is observed at forward (backward) rapidity compared to the binary scaled yields in p + p collisions. The magnitude of enhancement at backward rapidity is larger in p + Au collisions than in p + Al collisions, which have a smaller number of participating nucleons. However, the results at forward rapidity show a similar suppression within uncertainties. The results in the integrated centrality are compared with calculations using nuclear parton distribution functions, which show a reasonable agreement at the forward rapidity but fail to describe the backward rapidity enhancement.
Только метаданные
PHENIX Collaboration
(2019) Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Blau, D.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
Только метаданные
Measurement of ψ(2S) nuclear modification at backward and forward rapidity in p+p, p+Al, and p+Au collisions at sNN =200 GeV
(2022) Acharya, U. A.; Aidala, C.; Akiba, Y.; Alfred, M.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
© 2022 American Physical Society. Suppression of the J/ψ nuclear-modification factor has been seen as a trademark signature of final-state effects in large collision systems for decades. In small systems, the nuclear modification was attributed to cold-nuclear-matter effects until the observation of strong differential suppression of the ψ(2S) state in p+A and d+A collisions suggested the presence of final-state effects. Results of J/ψ and ψ(2S) measurements in the dimuon decay channel are presented here for p+p, p+Al, and p+Au collision systems at sNN=200GeV. The results are predominantly shown in the form of the nuclear-modification factor, RpA, the ratio of the ψ(2S) invariant yield per nucleon-nucleon collision in collisions of proton on target nucleus to that in p+p collisions. Measurements of the J/ψ and ψ(2S) nuclear-modification factor are compared with shadowing and transport-model predictions, as well as to complementary measurements at Large Hadron Collider energies.
Только метаданные
Measurement of jet-medium interactions via direct photon-hadron correlations in Au+Au and d+Au collisions at sNN =200 GeV
(2020) Acharya, U.; Adare, A.; Afanasiev, S.; Aidala, C.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
© 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.We present direct photon-hadron correlations in 200 GeV/A Au+Au, d+Au, and p+p collisions, for direct photon pT from 5-12 GeV/c, collected by the PHENIX Collaboration in the years from 2006 to 2011. We observe no significant modification of jet fragmentation in d+Au collisions, indicating that cold nuclear matter effects are small or absent. Hadrons carrying a large fraction of the quark's momentum are suppressed in Au+Au compared to p+p and d+Au. As the momentum fraction decreases, the yield of hadrons in Au+Au increases to an excess over the yield in p+p collisions. The excess is at large angles and at low hadron pT and is most pronounced for hadrons associated with lower momentum direct photons. Comparison to theoretical calculations suggests that the hadron excess arises from medium response to energy deposited by jets.
Только метаданные
PHENIX results on jet modification with pi(0)- and photon-triggered two particle correlations in p plus p, p(d) plus Au, and Au plus Au collisions
(2019) Osborn, J. D.; Adare, A.; Afanasiev, S.; Aidala, C.; Blau, D. S.; Riabov, V.; Samsonov, V.; Taranenko, A.; Блау, Дмитрий Сергеевич; Рябов, Виктор Германович; Тараненко, Аркадий Владимирович
As a colorless probe, direct photons balance the p(T) of the away-side jet at leading order. Direct photon-hadron correlations are thus an excellent probe for nuclear structure and QCD effects, including parton energy loss in the Quark-Gluon Plasma. PHENIX has measured pi(0) and direct photon-triggered two-particle azimuthal correlations in a variety of collision systems ranging from p+p to Au+Au at 200 GeV. In p+Au and d+Au collisions, no modification of the per-trigger jet yield or away-side correlation width compared to p+p collisions is observed for direct photon triggered correlations while an increase in the away-side width for pi(0) triggered correlations in p+Au has been measured. In Au+Au collisions, direct photons have been identified statistically as well as using an isolation cut. Combining data sets from different collision systems allows us to quantify the transition from suppression at high z(T) (P-T,P-h/P-T,P-gamma) to the enhancement of low z(T) particles relative to p+p, and to study this transition as a function of trigger p(T).