Thermal emission of pions in antiproton-proton annihilation at 12 GeV/c

Apeldoorn, G. W. van; Barshay, Saul; Harting, D.; Holthuizen, D.; Kuijer, P. G.; Pijlgroms, B.; Karimäki, V.; Kimumem, R.; Korkea-Aho, M.; Johnson, Philip W.; Michaelides, Panayotis G.; Michaelidou, Ch.; Patel, D.

doi:10.1007/bf01436312

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…Since the 0 ++ glueball is the state with the shortest lifetime, the fraction of glueballs that end up in the 0 ++ state is another important factor in estimating the LLP signal rate. However, the large ratio between the lightest glueball mass and the hidden QCD string tension suggests that 0 ++ states form a majority or at least a significant fraction of the produced states [266], based on modeling of hadronization processes as thermal emissions [267]. In figure 23 we therefore assume that the 0 ++ and other glueball fractions are given by spin-weighted Boltzmann factors for all kinematically available states.…”

Section: 211production Of Hidden Glueballs In Exotic Higgsmentioning

confidence: 99%

Long-lived particles at the energy frontier: the MATHUSLA physics case

et al. 2019

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We examine the theoretical motivations for long-lived particle (LLP) signals at the LHC in a comprehensive survey of standard model (SM) extensions. LLPs are a common prediction of a wide range of theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, and represent a natural and generic possibility for physics beyond the SM (BSM). In most cases the LLP lifetime can be treated as a free parameter from the µm scale up to the Big Bang Nucleosynthesis limit of ∼10 7 m. Neutral LLPs with lifetimes above ∼ 100 m are particularly difficult to probe, as the sensitivity of the LHC main detectors is limited by challenging backgrounds, triggers, and small acceptances. MATHUSLA is a proposal for a minimally instrumented, large-volume surface detector near ATLAS or CMS. It would search for neutral LLPs produced in HL-LHC collisions by reconstructing displaced vertices (DVs) in a low-background environment, extending the sensitivity of the main detectors by orders of magnitude in the long-lifetime regime. We study the LLP physics opportunities afforded by a MATHUSLA-like detector at the HL-LHC, assuming backgrounds can be rejected as expected. We develop a model-independent approach to describe the sensitivity of MATHUSLA to BSM LLP signals, and compare it to DV and missing energy searches at ATLAS or CMS. We then explore the BSM motivations for LLPs in considerable detail, presenting a large number of new sensitivity studies. While our discussion is especially oriented towards the long-lifetime regime at MATHUSLA, this survey underlines the importance of a varied LLP search program at the LHC in general. By synthesizing these results into a general discussion of the top-down and bottom-up motivations for LLP searches, it is our aim to demonstrate the exceptional strength and breadth of the physics case for the construction of the MATHUSLA detector.

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Section: 211production Of Hidden Glueballs In Exotic Higgsmentioning

confidence: 99%

Long-lived particles at the energy frontier: the MATHUSLA physics case

et al. 2019

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“…Since the 0 ++ glueball is the state with the shortest lifetime, the fraction of glueballs that end up in the 0 ++ state is another important factor in estimating the LLP signal rate. However, the large ratio between the lightest glueball mass and the hidden QCD string tension suggests that 0 ++ states form a majority or at least a significant fraction of the produced states [260], based on modeling of hadronization processes as thermal emissions [261]. In Fig.…”

Section: Production Of Hidden Glueballs In Exotic Higgs Decaysmentioning

confidence: 99%

Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case

Curtin,

Drewes,

McCullough

et al. 2018

Preprint

167

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We examine the theoretical motivations for long-lived particle (LLP) signals at the LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are a common prediction of a wide range of theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, and represent a natural and generic possibility for physics beyond the SM (BSM). In most cases the LLP lifetime can be treated as a free parameter from the µm scale up to the Big Bang Nucleosynthesis limit of ∼ 10 7 m. Neutral LLPs with lifetimes above ∼ 100m are particularly difficult to probe, as the sensitivity of the LHC main detectors is limited by challenging backgrounds, triggers, and small acceptances. MATHUSLA is a proposal for a minimally instrumented, large-volume surface detector near ATLAS or CMS. It would search for neutral LLPs produced in HL-LHC collisions by reconstructing displaced vertices (DVs) in a low-background environment, extending the sensitivity of the main detectors by orders of magnitude in the long-lifetime regime. In this white paper we study the LLP physics opportunities afforded by a MATHUSLA-like detector at the HL-LHC. We develop a model-independent approach to describe the sensitivity of MATHUSLA to BSM LLP signals, and compare it to DV and missing energy searches at AT-LAS or CMS. We then explore the BSM motivations for LLPs in considerable detail, presenting a large number of new sensitivity studies. While our discussion is especially oriented towards the long-lifetime regime at MATHUSLA, this survey underlines the importance of a varied LLP search program at the LHC in general. By synthesizing these results into a general discussion of the top-down and bottom-up motivations for LLP searches, it is our aim to demonstrate the exceptional strength and breadth of the physics case for the construction of the MATHUSLA detector.

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“…The charged particle multiplicity is sampled from a Poisson distribution centered on N ch = 10. It is instructive to consider two possibilities for the charged final state momenta: either all light-like, or with mass m = m π and energy distributed according to a thermal spectrum, P (E) ∝ exp[−E/T ] with T = 140 MeV as a crude model of soft pion emission [56].…”

Section: A Bias and Spread Of The Sphericity-based Boost Measurementmentioning

confidence: 99%

Analysis of long-lived particle decays with the MATHUSLA detector

2018

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The MATHUSLA detector is a simple large-volume tracking detector to be located on the surface above one of the general-purpose experiments at the Large Hadron Collider. This detector was proposed in [J. P. Chou, D. Curtin, and H. J. Lubatti, Phys. Lett. B 767, 29 (2017)] to detect exotic, neutral, long-lived particles that might be produced in high-energy proton-proton collisions. In this paper, we consider the use of the limited information that MATHULSA would provide on the decay products of the long-lived particle. For the case in which the long-lived particle is pair-produced in Higgs boson decays, we show that it is possible to measure the mass of this particle and determine the dominant decay mode with less than 100 observed events. We discuss the ability of MATHUSLA to distinguish the production mode of the longlived particle and to determine its mass and spin in more general cases.

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Thermal emission of pions in antiproton-proton annihilation at 12 GeV/c

Cited by 10 publications

References 13 publications

Long-lived particles at the energy frontier: the MATHUSLA physics case

Long-lived particles at the energy frontier: the MATHUSLA physics case

Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case

Analysis of long-lived particle decays with the MATHUSLA detector

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