Physics Opportunities in Ultraperipheral Heavy Ion Collisions at LHC

Baur, G.

doi:10.1142/9789812704214_0019

Cited by 3 publications

(5 citation statements)

References 18 publications

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“…[30]. 4 The spectrum with the form factor described by Fourier-Bessel parameters from Ref. [36] (see Table 4) and the spectrum with the monopole form factor with the parameter Λ = 50 MeV both describe the experimental data well.…”

Section: Muon Pair Production In Lead-lead Collisionsmentioning

confidence: 98%

“…Although the LHC was conceived as a hadron-hadron collider, it also acts as a photon-photon collider with the photons appearing in ultraperipheral collisions of hadrons. This idea is quite old, and it was thoroughly considered during the construction and operation of the RHIC and the LHC [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. However, since hadronic interactions were more likely to deliver the signal of New Physics, particularly in Higgs boson properties, they received more attention in the literature and were given higher priority in the LHC schedule.…”

Section: Introductionmentioning

confidence: 99%

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Equivalent photons in proton–proton and ion–ion collisions at the Large Hadron Collider

Высоцкий¹,

Zhemchugov²

2019

Phys.-Usp.

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Equivalent photon approximation is used to calculate fiducial cross sections for dimuon production in ultraperipheral proton-proton and lead-lead collisions. Analytical formulae taking into account experimental cuts are derived. The results are compared with the measurements reported by the ATLAS collaboration. IntroductionThis year we celebrate the 111th anniversary of L. D. Landau. This paper is devoted to the modern state of the problem first considered by L. D. Landau and E. M. Lifshitz in 1934 when they calculated the production cross section of e + e − pair in ultrarelativistic heavy ions collisions [1]. We will demonstrate that this problem is still of great interest.In spite of many efforts, no New Physics has been found at the LHC so far. It might be a good time to consider scenarios of appearance of New Physics at the LHC that were less attractive at the time when the LHC was under construction. Although the LHC was conceived as a hadron-hadron collider, it also acts as a photon-photon collider with the photons appearing in ultraperipheral collisions of hadrons. This idea is quite old, and it was thoroughly considered during the construction and operation of the RHIC and the LHC [2-16]. However, since hadronic interactions were more likely to deliver the signal of New Physics, particularly in Higgs boson properties, they received more attention in the literature and were given higher priority in the LHC schedule. With the long shutdown of the LHC beginning at the end of 2018, it might be a good time to reconsider photon-photon collisions at the LHC as a source of possible New Physics events so that the necessary detectors adjustments could be made and, perhaps, more time for heavy ions collisions could be negotiated in the LHC schedule.The leading order Feynman diagram for an ultraperipheral collision is presented in Fig. 1 where instead of lead nuclei there could be any charged particles. The distinctive signature of an ultraperipheral collision is that the charged particles remain intact after the collision. These particles won't have high transverse momentum, so they are difficult to detect with just the main detectors of the ATLAS and CMS experiments, but there exist additional detectors at low scattering angles (the ATLAS forward proton detector [17] and the CMS-TOTEM precision proton spectrometer [18]). However, even without the forward detectors, ultraperipheral collisions manifest through production of particles.Let us compare proton-proton and lead-lead ultraperipheral collisions as possible sources of New Physics events. Integrated luminosity delivered by the LHC in Run 2 in proton-proton collisions is over 150 fb −1 both for the ATLAS and the CMS experiments [19,20]. Integrated luminosity delivered by the LHC in lead-lead collisions in the heavy ions run was 0.7 nb −1 in 2015 [21] and 1.8 nb −1 in 2018 [19]. Cross section for an ultraperipheral collision is proportional to Z 4 where Z is the particle charge. For Pb, Z = 82, so we get that if there exists New Physics that appears in γγ collisi...

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Section: Muon Pair Production In Lead-lead Collisionsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Equivalent photons in proton–proton and ion–ion collisions at the Large Hadron Collider

Высоцкий¹,

Zhemchugov²

2019

Phys.-Usp.

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“…3 along with the survival factor (22). 3 The difference between the luminosities of photons with parallel and perpendicular polarizations is below 10%. Production of a pair of charged fermions χ + χ − with the charge 1 and the mass m χ is described by the Breit-Wheeler cross sections [36]:…”

Section: Production Of Heavy Charged Particlesmentioning

confidence: 99%

“…Protons accelerated at the LHC are the sources of strong electromagnetic fields carried by almost real equivalent photons. The idea to consider the LHC as a photon-photon collider was analyzed in detail long ago [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. If new charged particles exist, they should be produced in ultraperipheral collisions (UPC) of protons.…”

Section: Introductionmentioning

confidence: 99%

Production of heavy charged particles in proton-proton ultraperipheral collisions at the Large Hadron Collider: survival factor

Godunov,

Novikov,

Rozanov

et al. 2021

Preprint

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Ultraperipheral collisions of high energy protons are a source of approximately real photons colliding with each other. Photon fusion can result in production of yet unknown charged particles in very clean events. The cleanliness of such an event is due to the requirement that the protons survive during the collision. Finite sizes of the protons reduce the probability of such outcome compared to point-like particles. We calculate the survival factors and cross sections for the production of heavy charged particles at the Large Hadron Collider.

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Section: Introductionmentioning

confidence: 99%

Production of heavy charged particles in proton-proton ultraperipheral collisions at the Large Hadron Collider: survival factor

Годунов

Novikov

Rozanov

et al. 2021

J. High Energ. Phys.

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Physics Opportunities in Ultraperipheral Heavy Ion Collisions at LHC

Cited by 3 publications

References 18 publications

Equivalent photons in proton–proton and ion–ion collisions at the Large Hadron Collider

Equivalent photons in proton–proton and ion–ion collisions at the Large Hadron Collider

Production of heavy charged particles in proton-proton ultraperipheral collisions at the Large Hadron Collider: survival factor

Production of heavy charged particles in proton-proton ultraperipheral collisions at the Large Hadron Collider: survival factor

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