Direct photon production at low transverse momentum in proton-proton collisions at root s=2.76 and 8 TeV

doi:10.1103/PhysRevC.99.024912

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Direct photon production at low transverse momentum in proton-proton collisions at root s=2.76 and 8 TeV
	Acharya, S ; Acosta, FT ; Adamova, D ; Adolfsson, J ; Aggarwal, MM ; Rinella, GA ; Agnello, M ; Agrawal, N ; Ahammed, Z ; Ahn, SU
刊名	PHYSICAL REVIEW C
	2019
卷号	99 期号:2 页码:—
关键词	PB-PB COLLISIONS QUARK-GLUON PLASMA CHARGED-PARTICLE PRODUCTION NEUTRAL PION PREDICTIONS PERSPECTIVE DEPENDENCE SINGLE PP
ISSN号	2469-9985
DOI	10.1103/PhysRevC.99.024912
文献子类	期刊论文
英文摘要	Measurements of inclusive and direct photon production at midrapidity in pp collisions at root s = 2.76 and 8 TeV are presented by the ALICE experiment at the LHC. The results are reported in transverse momentum ranges of 0.4 < p(T) < 10 GeV/c and 0.3 < p(T) < 16 GeV/c, respectively. Photons are detected with the electromagnetic calorimeter (EMCal) and via reconstruction of e(+) e(-) pairs from conversions in the ALICE detector material using the central tracking system. For the final measurement of the inclusive photon spectra the results are combined in the overlapping p(T), interval of both methods. Direct photon spectra, or their upper limits at 90% C.L. are extracted using the direct photon excess ratio R-gamma, which quantifies the ratio of inclusive photons over decay photons generated with a decay-photon simulation. An additional hybrid method, combining photons reconstructed from conversions with those identified in the EMCal, is used for the combination of the direct photon excess ratio R-gamma, as well as the extraction of direct photon spectra or their upper limits. While no significant signal of direct photons is seen over the full p(T), range, R-gamma, for p(T), > 7 GeV/c is at least one sigma above unity and consistent with expectations from next-to-leading order pQCD calculations.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31560]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Aligarh Muslim Univ, Dept Appl Phys, Aligarh, Uttar Pradesh, India; 2.Yerevan Phys Inst Fdn, AI Alikhanyan Natl Sci Lab, Yerevan, Armenia; 3.Benemerita Univ Autonoma Puebla, Puebla, Mexico; 4.Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine; 5.Bose Inst, Dept Phys, Kolkata, India; 6.Bose Inst, Ctr Astroparticle Phys Space Sci CAPSS, Kolkata, India; 7.Budker Inst Nucl Phys, Novosibirsk, Russia; 8.Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA 93407 USA; 9.Cent China Normal Univ, Wuhan, Hubei, Peoples R China; 10.IN2P3, Ctr Calcul, Lyon, France;
推荐引用方式 GB/T 7714	Acharya, S,Acosta, FT,Adamova, D,et al. Direct photon production at low transverse momentum in proton-proton collisions at root s=2.76 and 8 TeV[J]. PHYSICAL REVIEW C,2019,99(2):—.
APA	Acharya, S.,Acosta, FT.,Adamova, D.,Adolfsson, J.,Aggarwal, MM.,...&Zou, S.(2019).Direct photon production at low transverse momentum in proton-proton collisions at root s=2.76 and 8 TeV.PHYSICAL REVIEW C,99(2),—.
MLA	Acharya, S,et al."Direct photon production at low transverse momentum in proton-proton collisions at root s=2.76 and 8 TeV".PHYSICAL REVIEW C 99.2(2019):—.