Search for stable heavy charged particles in e+e− collisions at , 161 and 172 GeV

Abreu, P.; Gil, E. Cortina

doi:10.1016/s0370-2693(97)00152-4

Cited by 19 publications

(3 citation statements)

References 19 publications

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“…Various searches have been performed to search for such particles [194]. At LEP, limits were set on CLLPs with charges 2 3 Q e , 4 3 Q e , and 5 3 Q e at a range of collision energies from 91 GeV to 209 GeV [162,195,196,197]. At the Tevatron, the CDF experiment set limits on CLLPs with charges 2 3 Q e and 1 3 Q e , excluding masses up to 250 GeV [169].…”

Section: Particles With Anomalous Electric Chargementioning

confidence: 99%

Collider searches for long-lived particles beyond the Standard Model

Lee

Ohm

Soffer

et al. 2019

Progress in Particle and Nuclear Physics

143

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Experimental tests of the Standard Model of particle physics (SM) find excellent agreement with its predictions. Since the original formation of the SM, experiments have provided little guidance regarding the explanations of phenomena outside the SM, such as the baryon asymmetry and dark matter. Nor have we understood the aesthetic and theoretical problems of the SM, despite years of searching for physics beyond the Standard Model (BSM) at particle colliders. Some BSM particles can be produced at colliders yet evade being discovered, if the reconstruction and analysis procedures not matched to characteristics of the particle. An example is particles with large lifetimes. As interest in searches for such long-lived particles (LLPs) grows rapidly, a review of the topic is presented in this article. The broad range of theoretical motivations for LLPs and the experimental strategies and methods employed to search for them are described. Results from decades of LLP searches are reviewed, as are opportunities for the next generation of searches at both existing and future experiments.

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Section: Particles With Anomalous Electric Chargementioning

confidence: 99%

Collider searches for long-lived particles beyond the Standard Model

Lee

Ohm

Soffer

et al. 2019

Progress in Particle and Nuclear Physics

143

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“…These are limits are weaker because the coupling of FCPs with Z-boson is suppressed by a sin 2 (θ W ) factor. A search for FCPs with = 2/3 was performed by OPAL using 1991-93 data [17,75,76], which rules out ≥2/3 for mass M < 84GeV .…”

Section: F11 Accelerator Based Experimentsmentioning

confidence: 99%

Search for lightly ionizing particles using CDMS-II data and fabrication of CDMS detectors with improved homogeneity in properties

Prasad

2013

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Fundamental particles are always observed to carry charges which are integral multiples of one-third charge of electron, e/3. While this is a well established experimental fact, the theoretical understanding for the charge quantization phenomenon is lacking. On the other hand, there exist numerous theoretical models that naturally allow for existence of particles with fractional electromagnetic charge. These particles, if existing, hint towards existence of physics beyond the standard model.Multiple high energy, optical, cosmological and astrophysical considerations restrict the allowable mass-charge parameter space for these fractional charges. Still, a huge unexplored region remains.The Cryogenic Dark Matter Search (CDMS-II), located at Soudan mines in northern Minnesota, employs germanium and silicon crystals to perform direct searches for a leading candidate to dark matter called Weakly Interacting Massive Particles (WIMPs). Alternately, the low detection threshold allows search for fractional electromagnetic-charged particles, or Lightly Ionizing Particles (LIPs), moving at relativistic speed. Background rejection is obtained by requiring that the magnitude and location of energy deposited in each detector be consistent with corresponding "signatures" resulting from the passage of a fractionally charged particle. In this dissertation, the CDMS-II data is analyzed to search for LIPs, with an expected background of 0.078±0.078 events. No candidate events are observed, allowing exclusion of new parameter space for charges between e/6 and e/200.With primary aim to increase sensitivity to detect WIMPs, it is necessary to expand the detector count and mass by more than two orders of magnitude over CDMS-II. This also increases sensitivity to detect LIPs. It becomes imperative ii to obtain repeatability in the detection sensor quality over multiple detectors. In this dissertation, we also describe the improvements and process flow optimizations implemented to obtain higher yield in fabrication of useful detectors with homogeneous sensor properties within each detector and among different batches. It also allows for reduction in fabrication time, cost and removal of avoidable cost-intensive steps like ion-implantation. Most important is the control in obtaining tungsten thin film with desired superconducting transition temperature and improvements in photolithographic steps for sensor fabrication.iii

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“…Although the masses of these particles can lie above the reach of current accelerators, experimental constraints on masses and charges of mCPs have been derived from fixed target accelerators [13][14][15][16][17][18][19][20], colliders [21][22][23][24][25][26][27][28], stellar models [3,[29][30][31], cosmic microwave background [29,30,[32][33][34][35][36][37], big-bang nucleosynthesis [30], Supernova 1987A [30,38], neutron stars [39,40], pulsars and gamma ray bursts [41], galaxy clusters [42], the Lamb shift [29,43,44], dark cosmic ray searches [45], positronium decay [46], reactor neutrinos [47,48], and the µ magnetic moment [29]. An early levitation experiment [49] found an indication for the existence for fractional charges that was not confirmed by following efforts [50,…”

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confidence: 99%

First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator

Alvis¹,

Arnquist²,

Avignone³

et al. 2018

Phys. Rev. Lett.

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The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.

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Search for stable heavy charged particles in e+e− collisions at , 161 and 172 GeV

Cited by 19 publications

References 19 publications

Collider searches for long-lived particles beyond the Standard Model

Collider searches for long-lived particles beyond the Standard Model

Search for lightly ionizing particles using CDMS-II data and fabrication of CDMS detectors with improved homogeneity in properties

First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator

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