pinecone/core-2020-05-10-deduplication huggingface dataset:
Covariant meson-baryon scattering with chiral and large N_c constraints

We give a review of recent progress on the application of the relativistic
chiral SU(3) Lagrangian to meson-baryon scattering. It is shown that a combined
chiral and 1/N_c expansion of the Bethe-Salpeter interaction kernel leads to a
good description of the kaon-nucleon, antikaon-nucleon and pion-nucleon
scattering data typically up to laboratory momenta of p_lab about 500 MeV. We
solve the covariant coupled channel Bethe-Salpeter equation with the
interaction kernel truncated to chiral order Q^3 where we include only those
terms which are leading in the large N_c limit of QCD.Comment: 27 pages, 5 figures, Invited talk given by M.F.M.L. at the IARD 2000
  meetin
Predicting positive parity $B_{s}$ mesons from lattice QCD

We determine the spectrum of $B_s$ 1P states using lattice QCD. For the
$B_{s1}(5830)$ and $B_{s2}^*(5840)$ mesons, the results are in good agreement
with the experimental values. Two further mesons are expected in the quantum
channels $J^P=0^+$ and $1^+$ near the $BK$ and $B^{*}K$ thresholds. A
combination of quark-antiquark and $B^{(*)}$ meson-Kaon interpolating fields
are used to determine the mass of two QCD bound states below the $B^{(*)}K$
threshold, with the assumption that mixing with $B_s^{(*)}\eta$ and
isospin-violating decays to $B_s^{(*)}\pi$ are negligible. We predict a
$J^P=0^+$ bound state $B_{s0}$ with mass $m_{B_{s0}}=5.711(13)(19)$ GeV. With
further assumptions motivated theoretically by the heavy quark limit, a bound
state with $m_{B_{s1}}= 5.750(17)(19)$ GeV is predicted in the $J^P=1^+$
channel. The results from our first principles calculation are compared to
previous model-based estimates.Comment: 5 pages, 2 figures; Final versio
Combining LEP and LHC to bound the Higgs Width

The correlation of on- and off-shell Higgs boson production at the LHC in $gg
\to h^* \to ZZ$ to bound the Higgs width, under specific model-dependent
assumptions, has recently received a lot of attention. As off-shell cross
section measurements in this channel suffer from a small signal yield, large
backgrounds, and theoretical uncertainties, we propose an alternative
complementary constraint which is only possible through the combination of LEP
and LHC measurements. Previous precision electroweak measurements at LEP allow
for the determination of indirect constraints on Higgs couplings to vector
bosons by considering one-loop processes involving virtual Higgs exchange. As
the Higgs is off-shell in these diagrams we venture that LEP can be interpreted
as an off-shell `Higgs Factory'. By combining these LEP constraints with
current LHC 8 TeV Higgs measurements a stronger limit on the Higgs width can be
achieved than with LHC data alone for models with rescaled Higgs couplings.
Looking to the future, avoiding ambiguities arising due to new physics
modifications of the $hGG$ coupling, a theoretically more robust constraint can
be achieved by correlating LEP measurements with WBF Higgs production followed
by Higgs decays to $WW$ and $ZZ$. This method for indirectly constraining the
Higgs width is very effective for specific BSM scenarios and is highly
complementary to other proposed methods. The limits we obtain particularly
highlight the power of a concrete LEP+LHC combination, not only limited to
Higgs width measurements.Comment: 17 page
Tracing kinematic (mis)alignments in CALIFA merging galaxies: Stellar
  and ionized gas kinematic orientations at every merger stage

We present spatially resolved stellar and/or ionized gas kinematic properties
for a sample of 103 interacting galaxies, tracing all merger stages: close
companions, pairs with morphological signatures of interaction, and coalesced
merger remnants. We compare our sample with 80 non-interacting galaxies. We
measure for the stellar and the ionized gas components the major (projected)
kinematic position angles (PA$_{\mathrm{kin}}$, approaching and receding)
directly from the velocity fields with no assumptions on the internal motions.
This method allow us to derive the deviations of the kinematic PAs from a
straight line ($\delta$PA$_{\mathrm{kin}}$). Around half of the interacting
objects show morpho-kinematic PA misalignments that cannot be found in the
control sample. Those misalignments are present mostly in galaxies with
morphological signatures of interaction. Alignment between the kinematic sides
for both samples is similar, with most of the galaxies displaying small
misalignments. Radial deviations of the kinematic PA from a straight line in
the stellar component measured by $\delta$PA$_{\mathrm{kin}}$ are large for
both samples. However, for a large fraction of interacting galaxies the ionized
gas $\delta$PA$_{\mathrm{kin}}$ is larger than typical values derived from
isolated galaxies (48%), making this parameter a good indicator to trace the
impact of interaction and mergers in the internal motions of galaxies. By
comparing the stellar and ionized gas kinematic PA, we find that 42% (28/66) of
the interacting galaxies have misalignments larger than 16 degrees, compared to
10% from the control sample. Our results show the impact of interactions in the
internal structure of galaxies as well as the wide variety of their velocity
distributions. This study also provides a local Universe benchmark for
kinematic studies in merging galaxies at high redshift.Comment: 24 pages,11 Figures, Accepted for publication in Astronomy &
  Astrophysics. The entire set of stellar and ionized gas velocity fields of
  the interacting/merging sample will be available in the electronic version of
  the journa
Galaxy clustering, CMB and supernova data constraints on $\phi$CDM model
  with massive neutrinos

We investigate a scalar field dark energy model (i.e., $\phi$CDM model) with
massive neutrinos, where the scalar field possesses an inverse power-law
potential, i.e., $V(\phi)\propto {\phi}^{-\alpha}$ ($\alpha>0$). We find that
the sum of neutrino masses $\Sigma m_{\nu}$ has significant impacts on the CMB
temperature power spectrum and on the matter power spectrum. In addition, the
parameter $\alpha$ also has slight impacts on the spectra. A joint sample,
including CMB data from Planck 2013 and WMAP9, galaxy clustering data from
WiggleZ and BOSS DR11, and JLA compilation of Type Ia supernova observations,
is adopted to confine the parameters. Within the context of the $\phi$CDM model
under consideration, the joint sample determines the cosmological parameters to
high precision. It turns out that $\alpha <4.995$ at 95% CL for the $\phi$CDM
model. And yet, the $\Lambda$CDM scenario corresponding to $\alpha = 0$ is not
ruled out at 95% CL. Moreover, we get $\Sigma m_{\nu}< 0.262$ eV at 95% CL for
the $\phi$CDM model, while the corresponding one for the $\Lambda$CDM model is
$\Sigma m_{\nu} < 0.293$ eV. The allowed scale of $\Sigma m_\nu$ in the
$\phi$CDM model is a bit smaller than that in the $\Lambda$CDM model. It is
consistent with the qualitative analysis, which reveals that the increases of
$\alpha$ and $\Sigma m_\nu$ both can result in the suppression of the matter
power spectrum. As a consequence, when $\alpha$ is larger, in order to avoid
suppressing the matter power spectrum too much, the value of $\Sigma m_\nu$
should be smaller.Comment: 15 pages, 4 figures, 1 tabl
Twist-3 fragmentation effects for $A_{LT}$ in light hadron production
  from proton-proton collisions

We compute the contribution from the twist-3 fragmentation function for light
hadron production in collisions between transversely and longitudinally
polarized protons, i.e., $p^\uparrow \vec{p} \to h\,X$, which can cause a
double-spin asymmetry (DSA) $A_{LT}$. This is a na\"ive T-even twist-3
observable that we analyze in collinear factorization using both Feynman gauge
and lightcone gauge as well as give a general proof of color gauge invariance.
So far only twist-3 effects in the transversely polarized proton have been
studied for $A_{LT}$ in $p^\uparrow \vec{p} \to h\,X$. However, there are
indications that the na\"ive T-odd transverse single-spin asymmetry (SSA) $A_N$
in $p^\uparrow p \to h\,X$ is dominated not by such distribution effects but
rather by a fragmentation mechanism. Therefore, one may expect similarly that
the fragmentation contribution is important for $A_{LT}$. Given possible plans
at RHIC to measure this observable, it is timely to provide a calculation of
this term.Comment: 11 pages, 5 figures, Minor changes, version to appear in PL
MAGIC gamma-ray and multi-frequency observations of flat spectrum radio quasar PKS 1510-089 in early 2012

Aims. Amongst more than fifty blazars detected in very high energy (VHE, E>100 GeV) γ rays, only three belong to the subclass of flat spectrum radio quasars (FSRQs). The detection of FSRQs in the VHE range is challenging, mainly because of their soft spectra in the GeV-TeV regime. MAGIC observed PKS 1510−089 (z=0.36) starting 2012 February 3 until April 3 during a high activity state in the high energy (HE, E>100 MeV) γ-ray band observed by AGILE and Fermi. MAGIC observations result in the detection of a source with significance of 6.0 standard deviations (σ). We study the multi-frequency behaviour of the source at the epoch of MAGIC observation, collecting quasi-simultaneous data at radio and optical (GASP-WEBT and F-Gamma collaborations, REM, Steward, Perkins, Liverpool, OVRO, and VLBA telescopes), X-ray (Swift satellite), and HE γ-ray frequencies. \ud
Methods. We study the VHE γ-ray emission, together with the multi-frequency light curves, 43 GHz radio maps, and spectral energy distribution (SED) of the source. The quasi-simultaneous multi-frequency SED from the millimetre radio band to VHE γ rays is modelled with a one-zone inverse Compton model. We study two different origins of the seed photons for the inverse Compton scattering, namely the infrared torus and a slow sheath surrounding the jet around the Very Long Baseline Array (VLBA) core.\ud
Results. We find that the VHE γ-ray emission detected from PKS 1510−089 in 2012 February-April agrees with the previous VHE observations of the source from 2009 March-April. We find no statistically significant variability during the MAGIC observations on daily, weekly, or monthly time scales, while the other two known VHE FSRQs (3C 279 and PKS 1222+216) have shown daily scale to sub-hour variability. The γ-ray SED combining AGILE, Fermi and MAGIC data joins smoothly and shows no hint of a break. The multi-frequency light curves suggest a common origin for the millimetre radio and HE γ-ray emission, and the HE γ-ray flaring starts when the new component is ejected from the 43 GHz VLBA core and the studied SED models fit the data well. However, the fast HE γ-ray variability requires that within the modelled large emitting region, more compact regions must exist. We suggest that these observed signatures would be most naturally explained by a turbulent plasma flowing at a relativistic speed down the jet and crossing a standing conical shock
BCL9/9L-β-catenin signaling is associated with poor outcome in colorectal cancer

BCL9/9L proteins enhance the transcriptional output of the β-catenin/TCF transcriptional complex and contribute critically to upholding the high WNT signaling level required for stemness maintenance in the intestinal epithelium. Here we show that a BCL9/9L-dependent gene signature derived from independent mouse colorectal cancer (CRC) models unprecedentedly separates patient subgroups with regard to progression free and overall survival. We found that this effect was by and large attributable to stemness related gene sets. Remarkably, this signature proved associated with recently described poor prognosis CRC subtypes exhibiting high stemness and/or epithelial-to-mesenchymal transition (EMT) traits. Consistent with the notion that highWNT signaling is required for stemness maintenance, ablating Bcl9/9l-β-catenin in murine oncogenic intestinal organoids provoked their differentiation and completely abrogated their tumorigenicity, while not affecting their proliferation. Therapeutic strategies aimed at targeting WNT responses may be limited by intestinal toxicity. Our findings suggest that attenuating WNT signaling to an extent that affects stemness maintenance without disturbing intestinal renewal might be well tolerated and prove sufficient to reduce CRC recurrence and dramatically improve disease outcome
Search for resonant pair production of Higgs bosons decaying to two bottom quark–antiquark pairs in proton–proton collisions at 8 TeV

A model-independent search for a narrow resonance produced in proton-proton collisions at $\sqrt{s}$ = 8 TeV and decaying to a pair of 125 GeV Higgs bosons that in turn each decays into a bottom quark–antiquark pair is performed by the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 17.9 fb−1. No evidence for a signal is observed. Upper limits at a 95% confidence level on the production cross section for such a resonance, in the mass range from 270 to 1100 GeV, are reported. Using these results, a radion with decay constant of 1 TeV and mass from 300 to 1100 GeV, and a Kaluza–Klein graviton with mass from 380 to 830 GeV are excluded at a 95% confidence level
First measurement of the differential branching fraction and $C\!P$ asymmetry of the $B^\pm\to\pi^\pm\mu^+\mu^-$ decay

The differential branching fraction with respect to the dimuon invariant mass squared, and the $C\!P$ asymmetry of the $B^\pm\to\pi^\pm\mu^+\mu^-$ decay are measured for the first time. The CKM matrix elements $|V_{td}|$ and $|V_{ts}|$, and the ratio $|V_{td}/V_{ts}|$ are determined. The analysis is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The total branching fraction and $C\!P$ asymmetry of $B^\pm\to\pi^\pm\mu^+\mu^-$ decays are measured to be \begin{eqnarray} \mathcal{B}(B^\pm\to\pi^\pm\mu^+\mu^-) = (1.83 \pm 0.24 \pm 0.05) \times 10^{-8}\,\,\,\mathrm{and} \nonumber\\ \mathcal{A}_{C\!P}(B^\pm\to\pi^\pm\mu^+\mu^-) = -0.11 \pm 0.12 \pm 0.01\,, \nonumber \end{eqnarray} where the first uncertainties are statistical and the second are systematic. These are the most precise measurements of these observables to date, and they are compatible with the predictions of the Standard Model
Multi-strange baryon production at mid-rapidity in Pb–Pb collisions at √sNN = 2.76 TeV

The production of Ξ−Ξ− and Ω−Ω− baryons and their anti-particles in Pb–Pb collisions at View the MathML sourcesNN=2.76 TeV has been measured using the ALICE detector. The transverse momentum spectra at mid-rapidity (|y|<0.5|y|<0.5) for charged Ξ and Ω hyperons have been studied in the range 0.6<pT<8.0 GeV/c0.6<pT<8.0 GeV/c and 1.2<pT<7.0 GeV/c1.2<pT<7.0 GeV/c, respectively, and in several centrality intervals (from the most central 0–10% to the most peripheral 60–80% collisions). These spectra have been compared with the predictions of recent hydrodynamic models. In particular, the Kraków and EPOS models give a satisfactory description of the data, with the latter covering a wider pTpT range. Mid-rapidity yields, integrated over pTpT, have been determined. The hyperon-to-pion ratios are similar to those at RHIC: they rise smoothly with centrality up to 〈Npart〉∼150〈Npart〉∼150 and saturate thereafter. The enhancements (yields per participant nucleon relative to those in pp collisions) increase both with the strangeness content of the baryon and with centrality, but are less pronounced than at lower energies
Searches for supersymmetry using the MT2 variable in hadronic events produced in pp collisions at 8 TeV

Searches for supersymmetry (SUSY) are performed using a sample of hadronic events produced in 8 TeV pp collisions at the CERN LHC. The searches are based on the MT2 variable, which is a measure of the transverse momentum imbalance in an event. The data were collected with the CMS detector and correspond to an integrated luminosity of 19.5 inverse femtobarns. Two related searches are performed. The first is an inclusive search based on signal regions defined by the value of the MT2 variable, the hadronic energy in the event, the jet multiplicity, and the number of jets identified as originating from bottom quarks. The second is a search for a mass peak corresponding to a Higgs boson decaying to a bottom quark-antiquark pair, where the Higgs boson is produced as a decay product of a SUSY particle. For both searches, the principal backgrounds are evaluated with data control samples. No significant excess over the expected number of background events is observed, and exclusion limits on various SUSY models are derived
The Role of the background in the extraction of resonance contributions from meson-baryon scattering.

The separation of background and resonance contributions in pion-nucleon scattering is an often discussed issue. We investigate to what extent the background can be separated from the pole contribution. For illustration we use results from an analytic model for the meson-baryon interaction derived from meson exchange. We focus oil the two distinct cases of an elastic and a highly inelastic resonance, namely the Delta(1232) and the Delta*(1700). Our results are also relevant for studies of dynamically generated resonances and attempts to extract bare quantities from hadronic models to be compared to quark model results. (C) 2009 Elsevier B.V. All rights reserved
Superfield theories on S 3 and their localization

We consider the superfield formulation of supersymmetric gauge and matter field theories on a three-dimensional sphere with rigid $ \mathcal{N} $ = 2 supersymmetry, as well as with $ \mathcal{N} $ > 2. The construction is based on a supercoset SU(2 | 1)/U(1) containing S 3 as the bosonic subspace. We derive an explicit form of SU(2 | 1)/U(1) supervielbein and covariant derivatives, and use them to construct classical superfield actions for gauge and matter supermultiplets in this superbackground. We then apply superfield methods for computing one-loop partition functions of these theories and demonstrate how the localization technique works directly in the superspace
Nonperturbative Bethe–Heitler pair creation in combined high- and low-frequency laser fields

The nonperturbative regime of electron–positron pair creation by a relativistic proton beam colliding with a highly intense bichromatic laser field is studied. The laser wave is composed of a strong low-frequency and a weak high-frequency mode, with mutually orthogonal polarization vectors. We show that the presence of the high-frequency field component can strongly enhance the pair-creation rate. Besides, a characteristic influence of the high-frequency mode on the angular and energy distributions of the created particles is demonstrated, both in the nuclear rest frame and the laboratory frame
Scheme dependence and transverse momentum distribution interpretation of Collins–Soper–Sterman resummation

Following an earlier derivation by Catani, de Florian and Grazzini (2000) on the scheme dependence in the Collins–Soper–Sterman (CSS) resummation formalism in hard scattering processes, we investigate the scheme dependence of the Transverse Momentum Distributions (TMDs) and their applications. By adopting a universal C -coefficient function associated with the integrated parton distributions, the difference between various TMD schemes can be attributed to a perturbative calculable function depending on the hard momentum scale. We further apply several TMD schemes to the Drell–Yan process of lepton pair production in hadronic collisions, and find that the constrained non-perturbative form factors in different schemes are consistent with each other and with that of the standard CSS formalism
Natural X-ray lines from the low scale supersymmetry breaking

In the supersymmetric models with low scale supersymmetry (SUSY) breaking where the gravitino mass is around keV, we show that the 3.5 keV X-ray lines can be explained naturally through several different mechanisms: (I) a keV scale dark gaugino plays the role of sterile neutrino in the presence of bilinear R -parity violation. Because the light dark gaugino obtains Majorana mass only via gravity mediation, it is a decaying warm dark matter (DM) candidate; (II) the compressed cold DM states, whose mass degeneracy is broken by gravity mediated SUSY breaking, emit such a line via the heavier one decay into the lighter one plus photon(s). A highly supersymmetric dark sector may readily provide such kind of system; (III) the light axino, whose mass again is around the gravitino mass, decays to neutrino plus gamma in the R -parity violating SUSY. Moreover, we comment on dark radiation from dark gaugino
Bose–Einstein condensation in the Rindler space

Based on the Unruh effect, we calculate the critical acceleration of the Bose–Einstein condensation in a free complex scalar field at finite density in the Rindler space. Our model corresponds to an ideal gas performing constantly accelerating motion in a Minkowski space–time at zero-temperature, where the gas is composed of the complex scalar particles and it can be thought to be in a thermal-bath with the Unruh temperature. In the accelerating frame, the model will be in the Bose–Einstein condensation state at low acceleration; on the other hand, there will be no condensation at high acceleration by the thermal excitation brought into by the Unruh effect. Our critical acceleration is the one at which the Bose–Einstein condensation begins to appear in the accelerating frame when we decrease the acceleration gradually. To carry out the calculation, we assume that the critical acceleration is much larger than the mass of the particle
Crystallisation of strontium sulphates from Si-bearing aqueous solutions

The crystallisation behaviour in the SrCl2–Na2SO4–H2O system at room temperature is strongly modified by the presence of dissolved silicon. Homogeneous nucleation experiments show that silicon inhibits the formation of celestite while promoting the precipitation of SrSO4·0.5H2O and an amorphous phase. Interfacial free energies for celestite have been calculated for increasing silicon concentrations from measurements of induction times for homogeneous nucleation. The slight increase in the interfacial free energies confirms that dissolved silicon is an inhibitor of celestite nucleation. In addition, dissolved silicon has striking morphological effects. Celestite grown in the presence of silicon typically shows rounded and peanut-like morphologies formed by numerous disoriented crystals. The anomalous celestite morphologies and the increase in both induction times and interfacial free energies reveal a complex interaction between silicic acids and celestite surfaces. In situ atomic force microscopy (AFM) was used to study in detail the effect of dissolved silicon on the growth of celestite (001) faces. AFM observations show that the presence of silicon increases the growth velocity of a first monolayer on the celestite (001) face. However, once such a first monolayer is formed, no further multilayer growth is observed. Height and friction AFM images show clear differences in contrast between the first monolayer and the celestite (001) substrate, revealing differences in composition and/or structure. High-resolution AFM images of the first monolayer show patterns consistent with the celestite (001) surface lattice, indicating that a limited amount of silicon can be incorporated into the celestite structure. Therefore, both the observed inhibition of nucleation and growth of celestite and the changes in crystal morphologies can be partially related to the formation of self-limiting Si-bearing celestite monolayers.Peer reviewe