Antinuclei production in Pb + Pb collisions at 158 A GeV/c

Appelquist, G.; Baglin, C.; Beringer, J.; Böhm, C.; Borer, K.; Bussiére, A.; Dittus, F.; Elsener, K.; Frei, D.; Gorodetzky, P.; Guillaud, J.P.; Hugentobler, E.; Klingenberg, R.; Lindén, T.; Lohmann, K D; Moser, U.; Pal, T.; Pretzl, K.; Schacher, J.; Selldén, B.; Stoffel, F.; Tuominiemi, J.; Zhang, Q. P.

doi:10.1016/0370-2693(96)00415-7

Cited by 29 publications

(18 citation statements)

References 38 publications

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“…Deuterons and antideuterons are copiously produced in heavy-ion collisions [1][2][3][4][5][6][7][8][9][10][11], but less abundantly in lighter particle collisions, such as pp [12,13] and pp [14] collisions, photoproduction γp [15], and e + e − annihilation at ϒ(nS) [16] and Z 0 [17] energies. Measurements of heavier antinuclei, such as antitritons and 3 He nuclei, have only been reported in pA [18,19] and AA collisions [11,[20][21][22][23]. The high luminosity provided by the LHC allows these measurements to be extended to higher energies and transverse momenta (p T ) than in previous experiments, and provides in addition the possibility to detect for the first time antinuclei heavier than antideuterons in pp collisions.…”

Section: Introductionmentioning

confidence: 96%

Production of deuterons, tritons, He3 nuclei, and their antinuclei in pp collisions at s=

Acharya¹,

Adam²,

Adamová³

et al. 2018

Phys. Rev. C

109

128

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Invariant differential yields of deuterons and antideuterons in pp collisions at √ s = 0.9, 2.76 and 7 TeV and the yields of tritons, 3 He nuclei, and their antinuclei at √ s = 7 TeV have been measured with the ALICE detector at the CERN Large Hadron Collider. The measurements cover a wide transverse momentum (p T ) range in the rapidity interval |y| < 0.5, extending both the energy and the p T reach of previous measurements up to 3 GeV/c for A = 2 and 6 GeV/c for A = 3. The coalescence parameters of (anti)deuterons and 3 He nuclei exhibit an increasing trend with p T and are found to be compatible with measurements in pA collisions at low p T and lower energies. The integrated yields decrease by a factor of about 1000 for each increase of the mass number with one (anti)nucleon. Furthermore, the deuteron-to-proton ratio is reported as a function of the average charged particle multiplicity at different center-of-mass energies.

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Section: Introductionmentioning

confidence: 96%

Production of deuterons, tritons, He3 nuclei, and their antinuclei in pp collisions at s=

Acharya¹,

Adam²,

Adamová³

et al. 2018

Phys. Rev. C

109

128

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“…Earlier measurements from Si 1 Au at the AGS and for minimum bias and p t 0 Pb 1 Pb (SPS) are reported in Refs. [3][4][5].…”

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confidence: 99%

“…Earlier measurements from Si 1 Au at the AGS and for minimum bias and p t 0 Pb 1 Pb (SPS) are reported in Refs. [3][4][5].In a simple coalescence approach [6,7], composite particles are formed only if the constituent particles are close in phase space at freeze-out. The invariant cross section of the cluster is then expressed as the product of the invariant cross sections of the constituents.…”

mentioning

confidence: 99%

Antideuteron Production in158AGeV/cPb+PbCollisions

Bearden¹,

Bøggild²,

Boissevain³

et al. 2000

Phys. Rev. Lett.

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The invariant cross section as a function of transverse momentum for antideuterons produced in 158A GeV͞c per nucleon Pb 1 Pb central collisions has been measured by the NA44 experiment at CERN. This measurement, together with a measurement of antiprotons, allows for the determination of the antideuteron coalescence parameter. The extracted coalescence radius is found to agree with the deuteron coalescence radius and radii determined from two particle correlations. PACS numbers: 25.75.Dw, 14.20.Dh, 25.40.Ve In central collisions of heavy ions, e.g., Pb 1 Pb, at ultrarelativistic energies, a region of highly compressed and heated nuclear matter is formed. This region subsequently expands both along and transverse to the beam direction until the constituent particles cease to interact at freezeout. In order to be able to derive characteristic energy and matter densities, it is important to determine the spatial extent and the density profile of the expanding source at the time of freeze-out. Such information has so far come primarily from Hanbury-Brown and Twiss (HBT) interferometry, where the extent of the source can be estimated from the dependence of the two particle correlation function on the relative momentum of the two particles (e.g., p 2 p [1,2]). Interpretation of HBT data normally relies on assumptions on the density profile of the emitting source.Independent information on source characteristics can be obtained from a different two body correlation, namely, the formation of deuterons and antideuterons. As a consequence of the small binding energy of the deuteron (2.2 MeV) compared to typical kinetic energies of the particles in the fireball, deuterons can survive only when the probability for collisions within the expanding source is very small, i.e., near freeze-out. At the same time, the formation of the bound two nucleon state requires the presence of a third body to conserve energy and momentum. This introduces a delicate dependence of the formation and survival probability of the (anti)deuteron on the size and density profile of the source.It is of particular interest to study the production of antideuterons and the associated freeze-out volume. Antideuterons are all produced in the collision, and the production rate will thus depend on the production and annihilation probabilities of antiparticles in the medium. Additionally, antideuterons have no contribution from spectator fragments, thus guaranteeing a measurement of the participant source volume. This Letter reports on the first systematic measurement of antiproton and antideuteron yields at nonzero transverse momenta from 158A GeV͞c Pb 1 Pb central collisions at the CERN SPS accelerator. Earlier measurements from Si 1 Au at the AGS and for minimum bias and p t 0 Pb 1 Pb (SPS) are reported in Refs. [3][4][5].In a simple coalescence approach [6,7], composite particles are formed only if the constituent particles are close in phase space at freeze-out. The invariant cross section of the cluster is then expressed as the product of the invaria...

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“…The first observation of antihelium-3 ( 3 He) production in heavy ion collisions was reported by NA52 in [1]. In the meantime more data have been collected at two rapidities y = 3.4 and 4.0 (see table 1).…”

Section: Introductionmentioning

confidence: 99%

Antihelium-3 production in lead-lead collisions at 158AGeV/c

et al. 2003

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Abstract. The NA52 experiment measured particle and antiparticle yields at 0 • production angle over a wide range in rapidity in lead-lead (Pb-Pb) collisions at 158 A GeV/c with a minimum bias trigger. Besides O(10 6 ) antiprotons (p) and O(10 3 ) antideuterons (d) a total of five antihelium-3 ( 3 He) were found. The resulting invariant differential 3 He production cross sections at p t 0 GeV/c turn out to be E d 3 σ dp 3 = (2.5 ± 1.8) × 10 −7 bc 3 GeV −2 at a rapidity of y = 3.4 in the laboratory system and (5.9 ± 3.4) × 10 −8 bc 3 GeV −2 at y = 4.0. The results are discussed in the framework of a simple coalescence model.

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Antinuclei production in Pb + Pb collisions at 158 A GeV/c

Cited by 29 publications

References 38 publications

Production of deuterons, tritons, He3 nuclei, and their antinuclei in pp collisions at s=

Production of deuterons, tritons, He3 nuclei, and their antinuclei in pp collisions at s=

Antideuteron Production in158AGeV/cPb+PbCollisions

Antihelium-3 production in lead-lead collisions at 158AGeV/c

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