Formation of heavy quarks in ultrarelativistic heavy-ion collisions

Schneider, Simon; Greiner, Walter; Soff, G.

doi:10.1103/physrevd.46.2930

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…S i n c e . the 'bare' value gs = 2 for the cdd proton yields p ~i = 4.0909 pn, which is in fair agreement with the measured value psi = 4.1 106 pn F i g and Williams 1953, Raghavan 1989. we choose gs = 2 (actually, the measured value gs = 5.5856 does not modify this correction to the energy splitting by more than 7%).…”

Section: L583supporting

confidence: 78%

The hyperfine structure of₈₃²⁰⁹Bi⁸²⁺

Schneider¹,

Schaffner²,

Greiner³

et al. 1993

J. Phys. B: At. Mol. Opt. Phys.

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The hyperfine structure splitting of the ground state of hydrogen-like 209Bi is calculated for an extended nuclear charge distribution. The probability density of the odd proton in 209Bi is taken into account explicitly in order to compute the effect of an extended magnetization distribution on the energy splitting. The probability density of the odd proton is deduced from a mean-field model and the magnetization correction is evaluated within the Bohr-Weisskopf formalism. The authors obtained a transition wavelength of Delta lambda =242.3 nm. An estimate for the QED corrections is provided.

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Section: L583supporting

confidence: 78%

The hyperfine structure of₈₃²⁰⁹Bi⁸²⁺

Schneider¹,

Schaffner²,

Greiner³

et al. 1993

J. Phys. B: At. Mol. Opt. Phys.

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“…The first estimate of the production of heavy quarks in such collisions was done in [199]. Central collisions were not excluded in their approach.…”

Section: Photon-gluon Fusion and The Gluon Structure Function In A Numentioning

confidence: 99%

“…It was found there that 210 t t pairs will be produced in a 10 6 s OO run at LHC (with an assumed luminosity of 1.4 × 10 31 cm −2 s −1 ). Top quark production has been studied before in [199]. In [45] the photon spectrum excluding central collisions and a more modern version of the gluon distribution function is used.…”

Section: Photon-gluon Fusion and The Gluon Structure Function In A Nu...mentioning

confidence: 99%

Coherent γγ and γA interactions in very peripheral collisions at relativistic ion colliders

et al. 2002

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Due to coherence, there are strong electromagnetic fields of short duration in very peripheral collisions. They give rise to photon-photon and photon-nucleus collisions with a high flux up to an invariant mass region hitherto unexplored experimentally. After a general survey of the field equivalent photon numbers and photon-photon luminosities, especially for relativistic heavy ion collisions, are discussed. Special care needs to be taken to include the effects of the strong interaction and nuclear size in this case. Photon-photon and photon-hadron physics at various invariant mass scales are then discussed. The maximum equivalent photon energy in the lab-system (collider frame) are typically of the order of 3 GeV for RHIC and 100 GeV for LHC. Diffractive processes are an important background process. Lepton-pair, especially electron-positron pair production is copious. Due to the strong fields there will be new phenomena, like multiple e + e − pair production. The experimental techniques to select γγ-processes are finally discussed together with important background processes.

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“…Shadowing plays little role in the total cross sections since at y = 0 and p T = 0, The only previous study of tt production via photon-gluon fusion in heavy ion collisions [17] used a very different photon flux. The flux was integrated over all r, including the nuclear interior, modelling the nucleus as a homogenously charged sphere.…”

mentioning

confidence: 99%

Photoproduction of top quarks in peripheral heavy ion collisions

2001

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In relativistic heavy ion collisions, top quarks can be produced by photongluon fusion when a photon from the Weizsäcker-Williams virtual photon field of one nucleus interacts with a gluon in the other nucleus. Photoproduction with heavy ions at the Large Hadron Collider (LHC) will be the first accessible non-hadronic top production channel. We calculate the tt photoproduction cross sections, pair mass and top quark rapidity distributions in peripheral lead-lead and oxygen-oxygen collisions. The cross sections are sensitive to the top quark charge and the large-Q 2 gluon distribution in the nucleus. We find a cross section of 15 pb in oxygen-oxygen collisions, leading to 210 pairs in a one month (10 6 s) LHC run. In pA collisions, the rate is higher, 1100 pairs per month for pO. A comparison of the AA and pA data might allow for a study of gluon shadowing at high Q 2 .

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Formation of heavy quarks in ultrarelativistic heavy-ion collisions

Cited by 9 publications

References 31 publications

The hyperfine structure of₈₃²⁰⁹Bi⁸²⁺

The hyperfine structure of₈₃²⁰⁹Bi⁸²⁺

Coherent γγ and γA interactions in very peripheral collisions at relativistic ion colliders

Photoproduction of top quarks in peripheral heavy ion collisions

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Formation of heavy quarks in ultrarelativistic heavy-ion collisions

Cited by 9 publications

References 31 publications

The hyperfine structure of83209Bi82+

The hyperfine structure of83209Bi82+

Coherent γγ and γA interactions in very peripheral collisions at relativistic ion colliders

Photoproduction of top quarks in peripheral heavy ion collisions

Contact Info

Product

Resources

About

The hyperfine structure of₈₃²⁰⁹Bi⁸²⁺

The hyperfine structure of₈₃²⁰⁹Bi⁸²⁺