Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV

J. Adam; D. Adamova; MM. Aggarwal; G. Aglieri Rinella; A. Agnello; N. Agrawal; Z. Ahammed; S.U. Ahn; I. Aimo; S. Aiola; Ian Bearden; Hans Bøggild; Christian Holm Christensen; Kristjan Herlache Gulbrandsen; Jens Jørgen Gaardhøje; Børge Svane Nielsen; Valentina Zaccolo; Alexander Colliander Hansen; Marek Chojnacki; Ante Bilandzic

doi:10.1016/j.physletb.2015.10.040

Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV

J. Adam, D. Adamova, MM. Aggarwal, G. Aglieri Rinella, A. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, I. Aimo, S. Aiola, Ian Bearden, Hans Bøggild, Christian Holm Christensen, Kristjan Herlache Gulbrandsen, Jens Jørgen Gaardhøje, Børge Svane Nielsen, Valentina Zaccolo, Alexander Colliander Hansen, Marek Chojnacki, Ante Bilandzic

Experimental Particle Physics

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Abstract

We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l⁺l⁻ and ψ(2S)→J/ψπ⁺π⁻ decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb⁻¹. The cross section for coherent ψ(2S) production in the rapidity interval −0.9<y<0.9 is dσ_ψ(2S) ^coh/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34_−0.07 ^+0.08(stat+syst). The obtained results are compared to predictions from theoretical models.

Original language	English
Journal	Physics Letters B
Volume	751
Pages (from-to)	358-370
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2015.10.040
Publication status	Published - 17 Dec 2015

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1-s2.0-S0370269315007996-mainFinal published version, 879 KBLicence: CC BY

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Adam, J., Adamova, D., Aggarwal, MM., Aglieri Rinella, G., Agnello, A., Agrawal, N., Ahammed, Z., Ahn, S. U., Aimo, I., Aiola, S., Bearden, I., Bøggild, H., Christensen, C. H., Gulbrandsen, K. H., Gaardhøje, J. J., Nielsen, B. S., Zaccolo, V., Hansen, A. C., Chojnacki, M., & Bilandzic, A. (2015). Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV. Physics Letters B, 751, 358-370. https://doi.org/10.1016/j.physletb.2015.10.040

Adam, J, Adamova, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, A, Agrawal, N, Ahammed, Z, Ahn, SU, Aimo, I, Aiola, S, Bearden, I , Bøggild, H , Christensen, CH , Gulbrandsen, KH , Gaardhøje, JJ , Nielsen, BS, Zaccolo, V, Hansen, AC, Chojnacki, M & Bilandzic, A 2015, 'Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV', Physics Letters B, vol. 751, pp. 358-370. https://doi.org/10.1016/j.physletb.2015.10.040

@article{ee69fdc71d0442ef9fd6a1192b174e28,

title = "Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV",

abstract = "We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9ψ(2S) coh/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34−0.07 +0.08(stat+syst). The obtained results are compared to predictions from theoretical models.",

author = "J. Adam and D. Adamova and MM. Aggarwal and {Aglieri Rinella}, G. and A. Agnello and N. Agrawal and Z. Ahammed and S.U. Ahn and I. Aimo and S. Aiola and Ian Bearden and Hans B{\o}ggild and Christensen, {Christian Holm} and Gulbrandsen, {Kristjan Herlache} and Gaardh{\o}je, {Jens J{\o}rgen} and Nielsen, {B{\o}rge Svane} and Valentina Zaccolo and Hansen, {Alexander Colliander} and Marek Chojnacki and Ante Bilandzic",

year = "2015",

month = dec,

day = "17",

doi = "10.1016/j.physletb.2015.10.040",

language = "English",

volume = "751",

pages = "358--370",

journal = "Physics Letters B: Particle Physics, Nuclear Physics and Cosmology",

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV

AU - Adam, J.

AU - Adamova, D.

AU - Aggarwal, MM.

AU - Aglieri Rinella, G.

AU - Agnello, A.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aimo, I.

AU - Aiola, S.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gulbrandsen, Kristjan Herlache

AU - Gaardhøje, Jens Jørgen

AU - Nielsen, Børge Svane

AU - Zaccolo, Valentina

AU - Hansen, Alexander Colliander

AU - Chojnacki, Marek

AU - Bilandzic, Ante

PY - 2015/12/17

Y1 - 2015/12/17

N2 - We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9ψ(2S) coh/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34−0.07 +0.08(stat+syst). The obtained results are compared to predictions from theoretical models.

AB - We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9ψ(2S) coh/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34−0.07 +0.08(stat+syst). The obtained results are compared to predictions from theoretical models.

U2 - 10.1016/j.physletb.2015.10.040

DO - 10.1016/j.physletb.2015.10.040

M3 - Journal article

SN - 0370-2693

VL - 751

SP - 358

EP - 370

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

ER -

Coherent psi (2S) photo-production in ultra-peripheral Pb-Pb collisions at root s(NN)=2.76TeV

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