Experimental plan of<i>Σ</i><i>p</i>scatterings at J-PARC

Miwa, K.; Honda, Ryumon; Matsumoto, Yu; Kanda, Hiroyuki; Tamura, H.; Ieiri, M.

doi:10.1051/epjconf/20122005001

Cited by 3 publications

(4 citation statements)

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“…Except for the measurements performed by the KTeV and NA-48 Collaborations in the Ξ 0 → Σ + channel [24][25][26][27][28], most of the SHD data is more than 30 years old [29]. On the other hand, (polarized) hyperons could be produced abundantly in the NA62 experiment at CERN [30] [65] or in any other hadron collider like the future pp facility PANDA [31] at FAIR/GSI or J-PARC [32].…”

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confidence: 99%

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Nonstandard Semileptonic Hyperon Decays

2015

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We investigate the discovery potential of semileptonic hyperon decays in terms of searches of new physics at teraelectronvolt scales. These decays are controlled by a small SU (3)-flavor breaking parameter that allows for systematic expansions and accurate predictions in terms of a reduced dependence on hadronic form factors. We find that muonic modes are very sensitive to non-standard scalar and tensor contributions and demonstrate that these could provide a powerful synergy with direct searches of new physics at the LHC.Introduction.-The meson and baryon semileptonic decays have played a crucial role in the discovery of the V − A structure [1] and quark-flavor mixing [2] of the (charged current) electroweak interactions in the Standard Model (SM). From a modern perspective, high-precision measurements of these decays provide a benchmark to test the SM and complement the direct searches of new physics (NP) at teraelectronvolt (TeV) energies.For example, the accurate determination of the elements V ud and V us of the Cabibbo-Kobayashi-Maskawa (CKM) matrix can be used to test its unitarity, constraining NP with characteristic scales as high as Λ ∼ 10 TeV [3]. Furthermore, one can test the V − A structure of the charged currents in d → u transitions using neutron and nuclear β decays [3][4][5][6][7][8][9] and pion decays [10,11]. Current limits for the associated NP scale are also at the TeV level, and important improvements are expected from future experiments [12]. Searches of non-standard d → u transitions can also be done using LHC data, through e.g. the collision of d and u partons in the pp → e ± + M ET + X channel (where MET stands for missing transverse energy) [12]. This leads to an interesting synergy between low-and high-energy NP searches in these flavor-changing processes.A similar comprehensive analysis of exotic effects in s → u transitions has not been done yet. The (semi)leptonic kaon decays are optimal laboratories for this study due to the intense program of high-precision measurements and accurate calculations of the relevant form factors that has been carried out over the last decades [13]. Indeed, bounds on righthanded [14,15] or scalar and tensor [16] NP interactions at the 10 −2 − 10 −3 level (relative to the SM) can be obtained [17,18]. Generally speaking, (pseudo)scalar and tensor operators modify the spectrum of the decay and a detailed knowledge of the q 2 dependence of the form factors becomes necessary [19].In this letter we investigate the physics potential of the semileptonic hyperon decays (SHD) to search for NP. Although the description of these modes may seem involved due to the presence of six nonperturbative matrix elements or form factors, they present interesting features [20][21][22][23]: (i) In the isospin limit, there are a total of 8 different channels, each having a differential decay rate with a rich angular dis-

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“…Hyperons can be produced in great numbers in current [30,32] and future facilities [31]. One may also wonder if better measurements could be extracted from the analysis of the data collected in past experiments like HyperCP [64], KTeV and NA48.…”

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confidence: 99%

Nonstandard Semileptonic Hyperon Decays

2015

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“…[10,11]. Further, latest data on hyperons is expected to come from the NA62 experiment at CERN [12], the p p collider at PANDA [13] and at FAIR/GSI or J-PARC [14].…”

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confidence: 99%

“…10 [5] from the Σ − → Λe − νe and Λ → pe − νe decays [11,12]. Future experiments are planning to measure the data on hyperons, for example, at CERN in the NA62 experiment [13], at PANDA in the pp collider [14] and at FAIR/GSI [15]. Theoretically, various studies have been carried out to understand SU(3) symmetry breaking.…”

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confidence: 99%

Decay parameters and the axial-vector form factors for strangeness changing as well as strangeness conserving semileptonic decays of the hyperons

2022

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We have calculated the axial-vector form factors for the hyperon semileptonic decays Bi → Bflv̄ in the chiral constituent quark model (χCQM). The decays considered here are the strangeness changing as well as strangeness conserving semileptonic decays of the hyperons. The conventional dipole form of parametrization has been used to analyse the Q2 dependence of the axialvector form factors (giBiBf (Q2)) as well their decay constants.

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