Measuring the masses of a pair of semi-invisibly decaying particles in central exclusive production with forward proton tagging

Harland–Lang, Lucian; Kom, C. H.; Sakurai, Kazuki; Stirling, W.J.

doi:10.1140/epjc/s10052-012-1969-2

Cited by 23 publications

(35 citation statements)

References 52 publications

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“…Sincem max takes the mass shell constraints into account, they are expected to have sharper distributions over the other variables. A comparison between these observables, and the precision on m true that can be achieved at the LHC usingm max will be discussed in a separate article [9].…”

mentioning

confidence: 99%

Mass Shell Technique for Measuring Masses of a Pair of Semi-Invisibly Decaying Particles

Sakurai

et al. 2012

Phys. Rev. Lett.

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Motivated by evidence for the existence of dark matter, many new physics models predict the pair production of new particles, followed by the decays into two invisible particles, leading to a momentum imbalance in the visible system. For the cases where all four components of the vector sum of the two 'missing' momenta are measured from the momentum imbalance, we present analytic solutions of the final state system in terms of measureable momenta, with the mass shell constraints taken into account. We then introduce new variables which allow the masses involved in the new physics process, including that of the dark matter particles, to be extracted. These are compared with a selection of variables in the literature, and possible applications at lepton and hadron colliders are discussed. Introduction.-If new physics (NP) is observed in collider experiments, the mass of the NP particles involved will be the first quantities to be measured. Motivated by the astrophysical evidence of dark matter, many theories beyond the Standard Model (SM) include a neutral dark matter (DM) candidate as the lightest of the new particles. In many of these models, the stability of the DM against decays into SM particles is enforced by a new (discrete) symmetry. Typically such symmetry implies that NP particles are pair produced in a collider, which subsequently cascade decay into a pair of DM particles that escape detection. An example is the minimal supersymmetric extension of the SM (MSSM) with R-parity.

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confidence: 99%

Mass Shell Technique for Measuring Masses of a Pair of Semi-Invisibly Decaying Particles

Sakurai

et al. 2012

Phys. Rev. Lett.

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“…Eqs. (16) and (17) are equivalent due to momentum conservation law, however experimental uncertainties give different contributions to these formulas, so both of them are useful when dealing with experimental data. In what follows we will use (17), which is less affected by finite detector resolution.…”

Section: Chargino Decays In the Body Of The Detector Producing A Disamentioning

confidence: 99%

“…A good example of New Physics that can be searched in ultraperipheral collisions is supersymmetry (SUSY) [13][14][15][16][17]. The supersymmetric partners of the electroweak bosons are six particles: four neutralinos and two charginos.…”

Section: Introductionmentioning

confidence: 99%

Quasistable charginos in ultraperipheral proton-proton collisions at the LHC

Годунов

Novikov

Rozanov

et al. 2020

J. High Energ. Phys.

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We propose an approach for the search of charged long-lived particles produced in ultraperipheral collisions at the LHC. The main idea is to improve event reconstruction at ATLAS and CMS with the help of their forward detectors. Detection of both scattered protons in forward detectors allows complete recovery of event kinematics. Though this requirement reduces the number of events, it greatly suppresses the background, including the strong background from the pile-up. * sgodunov@itep.ru † novikov@itep.ru ‡ rozanov@cppm.in2p3.fr § vysotsky@itep.ru ¶ zhemchugov@itep.ru 1 arXiv:1906.08568v2 [hep-ph] 12 Jul 20191 Concentration of relic charginos would be the same as neutralinos in the standard scenario (where neutralino is the LSP). For chargino mass of the order of 100 GeV, this value would be of the same order of magnitude as protons concentration, and it is in dramatic contradiction with, e.g., the bound of 10 −28 times protons concentration from Ref. [20].

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“…Compressed spectra can arise for example in natural SUSY, see for instance [24,25,26,27,28,29]. 6 The present lack of evidence for SUSY at the LHC makes it attractive to study the compressed scenario when, in a LHC collision, the lightest supersymmetric particle (LSP), often assumed to be neutralino, is close in mass to the parent sparticle (e.g. chargino).…”

Section: Compressed Mass Spectra Scenariosmentioning

confidence: 99%

“…In particular, this may be the case when the invisible object is produced via photon-photon fusion, see, for example [6]. Here we discuss the possibility of searching for such invisible objects in exclusive events…”

Section: Introductionmentioning

confidence: 99%

Can invisible objects be ‘seen’ via forward proton detectors at the LHC?

Хозе

Martin

Ryskin

2017

J. Phys. G: Nucl. Part. Phys.

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We discuss the possibility of identifying invisible objects (e.g. dark matter) via missing mass in Central Exclusive Processes; that is, in events where only forward protons are detected at the LHC. We show that the signal must have a cross section greater than 0.25 fb in order that it can be detected. We estimate the huge background caused by soft proton dissociation and evaluate the requirements of the detector 'veto' system needed to sufficiently suppress these events. In addition, we discuss the related process leading to the possible identification of the particles from the so-called 'compressed-mass Beyond the Standard Model (BSM)' scenarios. In this case the background is not so severe.

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Measuring the masses of a pair of semi-invisibly decaying particles in central exclusive production with forward proton tagging

Cited by 23 publications

References 52 publications

Mass Shell Technique for Measuring Masses of a Pair of Semi-Invisibly Decaying Particles

Mass Shell Technique for Measuring Masses of a Pair of Semi-Invisibly Decaying Particles

Quasistable charginos in ultraperipheral proton-proton collisions at the LHC

Can invisible objects be ‘seen’ via forward proton detectors at the LHC?

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