Exclusive <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>D</mml:mi><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> meson pair production in peripheral ultrarelativistic heavy-ion collisions

Łuszczak, Marta; Szczurek, Antoni

doi:10.1016/j.physletb.2011.04.050

Physics Letters B

2011

DOI: 10.1016/j.physletb.2011.04.050

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Exclusive DD¯ meson pair production in peripheral ultrarelativistic heavy-ion collisions

Marta Łuszczak

Antoni Szczurek

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Cited by 6 publications

References 16 publications

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D-meson decay constants and a check of factorization in non-leptonic B-decays

Bečirević¹,

Lubicz²,

Sanfilippo³

et al. 2012

J. High Energ. Phys.

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""We compute the vector meson decay constants fD*((s)) from the simulation of twisted mass QeD on the lattice with N-f - 2 dynamical quarks. When combining these values with the pseudoscalar D-(s)-meson decay constants, we were able (1) to show that the heavy quark spin symmetry breaking effects with the charm quark are large. fD*(s)\\\/fD(s) = 1.26(3), and (ii) to check the factorization approximation in a few specific B-meson non-leptonic decay modes. Besides our main results, fD* = 278 +\\\/- 13 +\\\/- 10 MeV, and fD*(s) = 311 +\\\/- 9 MeV, other phenomenologically interesting results of this paper are: fD*(s)\\\/fD* = 1.16 +\\\/- 0.02 +\\\/- 0.06, fD*(s)\\\/fD - 1.46 +\\\/- 0.05 +\\\/- 0.06, and fD(s)\\\/fD* - 0.89 +\\\/- 0.02 +\\\/- 0.03. Finally, we correct the value for B(B-0 -> D+pi(-)) quoted by PUG, and find B(B-0 -> D+pi(-)) = (7.8 +\\\/- 1.1) x 10(-7). Alternatively, by using the ratios discussed in this paper, we obtain B(B-0 -> D+pi(-)) - (8.3 +\\\/- 1.0 +\\\/- 0.8) X 10(-7)."

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D-meson decay constants and a check of factorization in non-leptonic B-decays

Bečirević¹,

Lubicz²,

Sanfilippo³

et al. 2012

J. High Energ. Phys.

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Exclusive production of lepton, quark and meson pairs in peripheral ultrarelativistic heavy ion collisions

Szczurek

2011

Nuclear Physics B - Proceedings Supplements

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We discuss exclusive production of lepton-antilepton, quark-antiquark, ππ and ρ 0 ρ 0 pairs in ultraperipheral, ultrarelativistic heavy-ion collisions.The cross sections for exclusive production of pairs of particles is calculated in Equivalent Photon Approximation (EPA). Realistic (Fourier transform of charge density) charge form factors of nuclei are used and the corresponding results are compared with the cross sections calculated with monopole form factor used in the literature. Absorption effects are discussed and quantified. The cross sections obtained with realistic form factors are significantly smaller than those obtained with the monopole form factors.The cross section for exclusive µ + µ − production in nucleus -nucleus collisions are calculated and some differential distributions are shown. The effect of absorption is bigger for large muon rapidities and/or large muon transverse momenta. We present predictions for LHC.We calculate cross section for exclusive production of π + π − and π 0 π 0 pairs. The elementary process γγ → ππ is discussed in detail. We concentrate on high-pt processes. We consider pQCD Brodsky-Lepage processes or alternatively hand-bag mechanism. The nuclear cross section is calculated within b-space EPA for RHIC and LHC.Similar analysis is performed for ρ 0 ρ 0 production, where the elementary cross section is less known. Our analysis includes a close-to-threshold enhancement of the cross section. The cross section for the low-energy phenomenon is parametrized and the high-energy cross section is calculated in a simple Regge model. Predictions for heavy ion collisions are presented.The cross section for exclusive heavy quark and heavy antiquark pair (QQ) production in heavy ion collisions is calculated for the LHC energy √ sNN = 5.5 TeV. Here we consider only processes with photon-photon interactions and omit diffractive contributions. We include both QQ, QQg and QQqq final states as well as photon singleresolved components. The different components give contributions of the same order of magnitude to the nuclear cross section. The cross sections found here are smaller than those for the diffractive photon-pomeron mechanism and larger than diffractive pomeron-pomeron discussed in the literature.

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Exclusive production of large invariant mass pion pairs in ultraperipheral ultrarelativistic heavy ion collisions

Kłusek-Gawenda

Szczurek

2011

Physics Letters B

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The cross section for exclusive production of π + π − and π 0 π 0 meson pairs in ultrarelativistic heavy ion collisions is calculated for LHC energy √ s N N = 3.5 TeV taking into account photonphoton mechanism. We concentrate on the production of large two-pion invariant masses where the mechanism of the elementary γγ → ππ process is not fully understood. In order to include a size of nuclei we perform calculation in the impact-parameter equivalent photon approximation (EPA). Realistic charge densities are used to calculate charged form factor of 208 Pb nucleus and to generate photon fluxes associated with ultrarelativistic heavy ions. Sizeable cross sections are obtained that can be measured at LHC. The cross section for elementary γγ → ππ is calculated in the framework of pQCD Brodsky-Lepage (BL) mechanism with the distribution amplitude used to descibe recent data of the BABAR collaboration on pion transition form factor, using handbag mechanism advocated to describe recent Belle data as well as t and u-channel meson/reggeon exchanges. We present distributions in two-pion invariant mass as well as the pion pair rapidity for the nuclear process.

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Exclusive DD¯ meson pair production in peripheral ultrarelativistic heavy-ion collisions

Cited by 6 publications

References 16 publications

D-meson decay constants and a check of factorization in non-leptonic B-decays

D-meson decay constants and a check of factorization in non-leptonic B-decays

Exclusive production of lepton, quark and meson pairs in peripheral ultrarelativistic heavy ion collisions

Exclusive production of large invariant mass pion pairs in ultraperipheral ultrarelativistic heavy ion collisions

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