BackExaminar Artículos por departamento (cas.) "Física teórica e historia de la ciencia"
Now showing items 61-80 of 120
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Nontopological Solitons in Abelian Gauge Theories Coupled to U(1) x U(1) Symmetric Scalar Fields
(American Physical Society, 2020-10-27)In a series of recent works, Ishihara and Ogawa have investigated nontopological solitons (Q-balls) in a spontaneously broken Abelian gauge theory coupled to two complex scalar fields. The present paper extends their ... -
Observation of a new structure near 10.75 GeV in the energy dependence of the e+e−→ ϒ (nS)π+π− (n = 1, 2, 3) cross sections
(Springer, 2019-10-22)We report a new measurement of the e(+)e(-)-> Upsilon(nS)pi(+)pi(-) (n = 1, 2, 3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) ... -
Observation of a vector charmoniumlike state in e(+)e(-) -> D-s(+) D-s1 (2536)(-) + c.c.
(American Physical Society, 2019-12-31)Using a data sample of 921.9 fb(-1) collected with the Belle detector, we study the process of e(+)e(-)-> Ds+Ds1(2536)(-) + c.c. via initial-state radiation. We report the first observation of a vector charmoniumlike state ... -
Observation of an Excited Omega(-) Baryon
(American Physical Society, 2018-08-02)Using data recorded with the Belle detector, we observe a new excited hyperon, an Omega*(-) candidate decaying into Xi K-0(-) and Xi K--(S)0 with a mass of 2012.4 +/- 0.7(stat) +/- 0.6(syst) McV/c(2) and a width of Gamma ... -
Observation of tau(-) -> pi(-)nu(tau)e(+)e(-) and search for tau(-) -> pi(-)nu(tau)mu(+)mu(-)
(American Physical Society, 2019-10-15)We present the first measurements of branching fractions of rare tau-lepton decays, tau(-) -> pi(-)nu(tau)l(+)l(-) (l = e or mu), using a data sample corresponding to 562 fb(-1) collected at a center-of-mass energy of 10.58 ... -
Observation of the Radiative Decays of Upsilon(1S) to chi(c1)
(American Physical Society, 2020-03-26)We report the first observation of the radiative decay of the Upsilon(1S) into a charmonium state. The significance of the observed signal of Upsilon(1S) -> gamma chi(c1) is 6.3 standard deviations including systematics. ... -
Observation of the Radiative Decays of Υ(1S) to χc1
(American Physical Society, 2020-03-26)We report the first observation of the radiative decay of the Upsilon(1S) into a charmonium state. The significance of the observed signal of Upsilon(1S) -> gamma chi(c1) is 6.3 standard deviations including systematics. ... -
Observation of TransverseΛ= ̄ΛHyperon Polarization ine+e−Annihilation at Belle
(American Physical Society, 2019-01-29)We report the first observation of the spontaneous polarization of Lambda and (Lambda) over bar hyperons transverse to the production plane in e(+)e(-) annihilation, which is attributed to the effect arising from a polarizing ... -
Observation of Xi(1620)(0) and Evidence for Xi(1690)(0) in Xi(+)(c) -> Xi(-) pi(+) pi(+) Decays
(American Physical Society, 2019-02-21)We report the first observation of the double strange baryon Xi(1620)(0) in its decay to Xi(-) pi(+) via Xi(+)(c) -> Xi(-)pi(+)pi(+) decays based on a 980 fb(-1) data sample collected with the Belle detector at the KEKB ... -
Observation of τ−→π−ντe+e− and search for τ−→π−ντμ+μ−
(American Physical Society, 2019)We present the first measurements of branching fractions of rare tau-lepton decays, tau(-) -> pi(-)nu(tau)l(+)l(-) (l = e or mu), using a data sample corresponding to 562 fb(-1) collected at a center-of-mass energy of 10.58 ... -
Observation of Υ(2S)→γηb(1S) Decay
(American Physical Society, 2018-12-03)We report the observation of gamma(2S) -> gamma eta(b)(1S) based on an analysis of the inclusive photon spectrum of 24.7 fb(-1) of e(+)e(-) collisions at the gamma(2s) center-of-mass energy collected with the Belle detector ... -
Observation of Υ(4S) → η1 Υ (1S)
Guido, E.; Mussa, R.; Tamponi, U.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.; Bakich, A. M.; Bansal, V.; Behera, P.; Berger, M.; Bhardwaj, V.; Biswal, J.; Bondar, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Červenkov, D.; Chekelian, V.; Chen, A.; Cheon, B. G.; Chilikin, K.; Cho, K.; Choi, S. K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cunliffe, S.; Di Carlo, S.; Doležal, Z.; Eidelman, S.; Epifanov, D.; Fast, J. E.; Ferber, T.; Fulsom, B. G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Gelb, M.; Giri, A.; Goldenzweig, P.; Haba, J.; Hara, T.; Hayashii, H.; Hedges, M. T.; Hou, W.-S.; Inami, K.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W. W.; Jeon, H. B.; Jia, S.; Jin, Y.; Julius, T.; Kang, K. H.; Karyan, G.; Kawasaki, T.; Kiesling, C.; Kim, D. Y.; Kim, J. B.; Kim, K. T.; Kim, S. H.; Kinoshita, K.; Kodyš, P.; Korpar, S.; Kotchetkov, D.; Križan, P.; Kroeger, R.; Krokovny, P.; Kulasiri, R.; Kumar, R.; Kumita, T.; Kuzmin, A.; Kwon, Y.-J.; Lee, I. S.; Lee, S. C.; Li, L. K.; Li, Y. B.; Gioi, L. Li; Libby, J.; Liventsev, D.; Lubej, M.; Luo, T.; MacNaughton, J.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Moon, H. K.; Mori, T.; Nakano, E.; Nakao, M.; Nanut, T.; Nath, K. J.; Nayak, M.; Niiyama, M.; Nishida, S.; Ogawa, S.; Ono, H.; Ostrowicz, W.; Pakhlova, G.; Pal, B.; Pardi, S.; Park, C. W.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Popov, V.; Rostomyan, A.; Russo, G.; Sakai, Y.; Salehi, M.; Sanuki, T.; Schneider, O.; Schnell, Gunar; Schwanda, C.; Seino, Y.; Shebalin, V.; Shen, C. P.; Shibata, T. A.; Shiu, J.-G.; Shwartz, B.; Sokolov, A.; Starič, M.; Strube, J. F.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tanida, K.; Tenchini, F.; Uchida, M.; Uglov, T.; Unno, Y.; Usov, Y.; Van Hulse, Charlotte Barbara; Varner, G.; Vinokurova, A.; Wang, B.; Wang, C. H.; Wang, M. Z.; Wang, P.; Wang, X. L.; Watanabe, M.; Watanabe, Y.; Widmann, E.; Won, E.; Ye, H.; Yelton, J.; Yuan, C. Z.; Yusa, Y.; Zakharov, S.; Zhang, Z. P.; Zhilich, V.; Zhukova Zhukova, Valentina
; Zhulanov, V. (American Physical Society, 2018-08-06)
We report the first observation of the hadronic transition Upsilon(4S) -> eta'Upsilon(1S), using 496 fb(-1) data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. ... -
Observational constraints on the unified dark matter and dark energy model based on the quark bag model
Montiel, Ariadna; Salzano, Vincenzo; Lazcoz Sáez, Ruth (Elsevier, 2014-06-02)
In this work we investigate if a small fraction of quarks and gluons, which escaped hadronization and survived as a uniformly spread perfect fluid, can play the role of both dark matter and dark energy. This fluid, as ... -
On p-Form Gauge Theories and their Conformal Limits
(Springer, 2021-03-02)Relations between the various formulations of nonlinear p-form electrodynamics with conformal-invariant weak-field and strong-field limits are clarified, with a focus on duality invariant (2n - 1)-form electrodynamics and ... -
On polarized scattering equations for superamplitudes of 11D supergravity and ambitwistor superstring
(Springer, 2019-11-14)We revisited the formalism of 110 polarized scattering equation by Geyer and Mason from the perspective of spinor frame approach and spinor moving frame formulation of the 110 ambitwistor superstring action. In particular, ... -
On the universality of MOG weak field approximation at galaxy cluster scale
De Martino, Ivan; (Elsevier, 2017-07-10)
In its weak field limit, Scalar-tensor-vector gravity theory introduces a Yukawa-correction to the gravitational potential. Such a correction depends on the two parameters, alpha which accounts for the modification of the ... -
PDF profiling using the forward-backward asymmetry in Neutral Current Drell-Yan production
(Springer, 2019-10-15)Non-perturbative QCD effects from Parton Distribution Functions (PDFs) may be constrained by using high-statistics Large Hadron Collider (LHC) data. Drell-Yan (DY) measurements in the Charged Current (CC) case provide one ... -
Permutationally invariant state reconstruction
(IOP Publishing, 2012-10)Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, an efficient way to reconstruct the density operator from the observed finite data set. Since state ... -
Phantom dark ghost in Einstein–Cartan gravity
Chang, Yu-Chiao; Bouhmadi López, Mariam; Chen, Pisin (Springer, 2017-05-03)
A class of dynamical dark energy models is constructed through an extended version of fermion fields corresponding to phantom dark ghost spinors, which are spin 1/2 with mass dimension 1. We find that if these spinors ... -
Possible antigravity regions in F (R) theory?
(Elsevier, 2014-03-07)We construct an F(R) gravity theory corresponding to the Weyl invariant two scalar field theory. We investigate whether such F (R) gravity can have the antigravity regions where the Weyl curvature invariant does not diverge ...