941 research outputs found
Eviction of a 125 GeV "heavy"-Higgs from the MSSM
We prove that the present experimental constraints are already enough to rule
out the possibility of the ~125 GeV Higgs found at LHC being the second
lightest Higgs in a general MSSM context, even with explicit CP violation in
the Higgs potential. Contrary to previous studies, we are able to eliminate
this possibility analytically, using simple expressions for a relatively small
number of observables. We show that the present LHC constraints on the diphoton
signal strength, tau-tau production through Higgs and BR(B -> X_s gamma) are
enough to preclude the possibility of H_2 being the observed Higgs with m_H~125
GeV within an MSSM context, without leaving room for finely tuned
cancellations. As a by-product, we also comment on the difficulties of an MSSM
interpretation of the excess in the gamma-gamma production cross section
recently found at CMS that could correspond to a second Higgs resonance at
m_H~136 GeV.Comment: 38 pages, 9 figures. Final version accepted at JHEP. Sections 2, 3
and appendices simplified. Experimental results updated, several references
added. Small typos corrected and a new comparison of approximate formulas
with full expressions include
Exactly solvable pairing model for superconductors with a p+ip-wave symmetry
We present the exact Bethe ansatz solution for the two-dimensional BCS
pairing Hamiltonian with p_x + i p_y symmetry. Using both mean-field theory and
the exact solution we obtain the ground-state phase diagram parameterized by
the filling fraction and the coupling constant. It consists of three phases
denoted weak coupling BCS, weak pairing, and strong pairing. The first two
phases are separated by a topologically protected line where the exact ground
state is given by the Moore-Read pfaffian state. In the thermodynamic limit the
ground-state energy is discontinuous on this line. The other two phases are
separated by the critical line, also topologically protected, previously found
by Read and Green. We establish a duality relation between the weak and strong
pairing phases, whereby ground states of the weak phase are "dressed" versions
of the ground states of the strong phase by zero energy (Moore-Read) pairs and
characterized by a topological order parameter.Comment: 4 pages, 2 figures. Discussion on winding numbers added. Accepted in
Phys Rev
Implementing ARP-Path Low Latency Bridges in NetFPGA
The demo is focused on the implementation of ARP-Path (a.k.a. FastPath) bridges, a recently proposed concept for low latency bridges. ARP-Path Bridges rely on the race between broadcast ARP Request packets, to discover the minimum latency path to the destination host. Several implementations (in Omnet++, Linux, OpenFlow, NetFPGA) have shown that ARP-Path exhibits loop-freedom, does not block links, is fully transparent to hosts and neither needs a spanning tree protocol to prevent loops nor a link state protocol to obtain low latency paths. This demo compares our hardware implementation on NetFPGA to bridges running STP, showing that ARP-Path finds lower latency paths than STP.Comunidad de MadridJunta de Comunidades de Castilla-La Manch
Projection and Fukushima's gap based methods for the asymmetric traffic assignment problem
Report de recerca DR 2012/2
The research reported in this paper has been funded by projects SIMETRIA (Ref. P 63/08,
27.11.2008), of the Spanish R+D National Programs and project TRA2008-06782-C02-02.Preprin
Self-similar static solutions admitting a two-space of constant curvature
A recent result by Haggag and Hajj-Boutros is reviewed within the framework
of self-similar space-times, extending, in some sense, their results and
presenting a family of metrics consisting of all the static spherically
symmetric perfect fluid solutions admitting a homothety.Comment: 6 page
Detection of growth-related QTLs in turbot (Scophtalmus maximux)
Background The turbot (Scophthalmus maximus) is a highly appreciated European aquaculture species. Growth related traits constitute the main goal of the ongoing genetic breeding programs of this species. The recent construction of a consensus linkage map in this species has allowed the selection of a panel of 100 homogeneously distributed markers covering the 26 linkage groups (LG) suitable for QTL search. In this study we addressed the detection of QTL with effect on body weight, length and Fulton's condition factor.
Results Eight families from two genetic breeding programs comprising 814 individuals were used to search for growth related QTL using the panel of microsatellites available for QTL screening. Two different approaches, maximum likelihood and regression interval mapping, were used in order to search for QTL. Up to eleven significant QTL were detected with both methods in at least one family: four for weight on LGs 5, 14, 15 and 16; five for length on LGs 5, 6, 12, 14 and 15; and two for Fulton's condition factor on LGs 3 and 16. In these LGs an association analysis was performed to ascertain the microsatellite marker with the highest apparent effect on the trait, in order to test the possibility of using them for marker assisted selection.
Conclusions The use of regression interval mapping and maximum likelihood methods for QTL detection provided consistent results in many cases, although the high variation observed for traits mean among families made it difficult to evaluate QTL effects. Finer mapping of detected QTL, looking for tightly linked markers to the causative mutation, and comparative genomics are suggested to deepen in the analysis of QTL in turbot so they can be applied in marker assisted selection programs
A Geometry of the Generations
We propose a geometric theory of flavor based on the discrete group
, in the context of the minimal supersymmetric standard model. The
group treats three objects symmetrically, while making fundamental distinctions
between the generations. The top quark is the only heavy quark in the symmetry
limit, and the first and second generation squarks are degenerate. The
hierarchical nature of Yukawa matrices is a consequence of a sequential
breaking of .Comment: 10 pages, 1 EPS figure as uuencoded tar-compressed file, uses
psfig.st
Inverting the Supersymmetric Standard Model Spectrum: from Physical to Lagrangian Ino Parameters
We examine the possibility of recovering the supersymmetric (and soft
supersymmetry breaking) Lagrangian parameters as direct {\em analytical}
expressions of appropriate physical masses, for the unconstrained (but CP and
R-parity conserving) minimal supersymmetric standard model. We concentrate
mainly on the algebraically non-trivial "inversion" for the ino parameters, and
obtain, for given values of , simple analytical expressions for the
, and parameters in terms of three arbitrary input physical
masses, namely either two chargino and one neutralino masses, or alternatively
one chargino and two neutralino masses. We illustrate and discuss in detail the
possible occurrence of ambiguities in this reconstruction. The dependence of
the resulting ino Lagrangian parameters upon physical masses is illustrated,
and some simple generic behaviour uncovered in this way. We finally briefly
sketch generalizing such an inversion to the full set of MSSM Lagrangian
parameters.Comment: Latex, 28 pages, 6 figures, 1 table, some typos corrected, one
paragraph extended in section 4.2. Version to appear in Phys. Rev.
FT-MIR determination of taste-related compounds in tomato: a high throughput phenotyping analysis for selection programs
"This is the peer reviewed version of the following article: Ibáñez, Ginés, Mercedes Valcárcel, Jaime Cebolla-Cornejo, and Salvador Roselló. 2019. FT-MIR Determination of Taste-related Compounds in Tomato: A High Throughput Phenotyping Analysis for Selection Programs. Journal of the Science of Food and Agriculture 99 (11). Wiley: 5140 48. doi:10.1002/jsfa.9760, which has been published in final form at https://doi.org/10.1002/jsfa.9760. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."[EN] BACKGROUND: Tomato taste is defined by the accumulation of sugars and organic acids. Individual analyses of these compounds using high-performance liquid chromatography (HPLC) or capillary zone electrophoresis (CZE) are expensive, time-consuming and are not feasible for large number of samples, justifying the interest of spectroscopic methods such as Fourier-transform mid-infrared (FT-MIR). This work analyzed the performance of FT-MIR models to determine the accumulation of sugars and acids, considering the efficiency of models obtained with different ranges of variation. RESULTS: FT-MIR spectra (five-bounce attenuated total reflectance, ATR) were used to obtain partial least squares (PLS) models to predict sugar and acid contents in specific sample sets representing different varietal types. A general model was also developed, obtaining R-2 values for prediction higher than 0.84 for main components (soluble solids content, fructose, glucose, and citric acid). Root mean squared error of prediction (RMSEP) for these components were lower than 15% of the mean contents and lower than 6% of the highest contents. Even more, the model sensitivity and specificity for those variables with a 10% selection pressure was 100%. That means that all samples with the 10% highest content were correctly identified. The model was applied to an external assay and it exhibited, for main components, high sensitivities (> 70%) and specificities (> 96%). RMSEP values for main compounds were lower than 21% and 13% of the mean and maximum content respectively. CONCLUSION: The models obtained confirm the effectiveness of FT-MIR models to select samples with high contents of taste-related compounds, even when the calibration has not been performed within the same assay. (c) 2019 Society of Chemical IndustryThis research was performed despite the lack of direct public funding for its development and thanks to the enthusiasm of the authors. The authors thank Dr Lahoz and Dr Campillo for providing samples of processing tomato. G. Ibanez thanks Universitat Jaume I for funding his pre-doctoral grant (PREDOC/2015/45).Ibañez, G.; Valcárcel-Germes, M.; Cebolla Cornejo, J.; Rosello Ripolles, S. (2019). FT-MIR determination of taste-related compounds in tomato: a high throughput phenotyping analysis for selection programs. Journal of the Science of Food and Agriculture. 99(11):5140-5148. https://doi.org/10.1002/jsfa.9760514051489911Davies, J. N., Hobson, G. E., & McGlasson, W. B. (1981). The constituents of tomato fruit — the influence of environment, nutrition, and genotype. C R C Critical Reviews in Food Science and Nutrition, 15(3), 205-280. doi:10.1080/10408398109527317Díaz de León-Sánchez, F., Pelayo-Zaldívar, C., Rivera-Cabrera, F., Ponce-Valadez, M., Ávila-Alejandre, X., Fernández, F. J., … Pérez-Flores, L. J. (2009). Effect of refrigerated storage on aroma and alcohol dehydrogenase activity in tomato fruit. Postharvest Biology and Technology, 54(2), 93-100. doi:10.1016/j.postharvbio.2009.07.003Cebolla-Cornejo, J., Valcárcel, M., Herrero-Martínez, J. M., Roselló, S., & Nuez, F. (2012). High efficiency joint CZE determination of sugars and acids in vegetables and fruits. ELECTROPHORESIS, 33(15), 2416-2423. doi:10.1002/elps.201100640Nicolaï, B. M., Beullens, K., Bobelyn, E., Peirs, A., Saeys, W., Theron, K. I., & Lammertyn, J. (2007). Nondestructive measurement of fruit and vegetable quality by means of NIR spectroscopy: A review. Postharvest Biology and Technology, 46(2), 99-118. doi:10.1016/j.postharvbio.2007.06.024Lahoz, I., Leiva-Brondo, M., Martí, R., Macua, J. I., Campillo, C., Roselló, S., & Cebolla-Cornejo, J. (2016). Influence of high lycopene varieties and organic farming on the production and quality of processing tomato. Scientia Horticulturae, 204, 128-137. doi:10.1016/j.scienta.2016.03.042Martí, R., Valcárcel, M., Leiva-Brondo, M., Lahoz, I., Campillo, C., Roselló, S., & Cebolla-Cornejo, J. (2018). Influence of controlled deficit irrigation on tomato functional value. Food Chemistry, 252, 250-257. doi:10.1016/j.foodchem.2018.01.098Fearn, T. (2002). Assessing Calibrations: SEP, RPD, RER and R2. NIR news, 13(6), 12-13. doi:10.1255/nirn.689Vermeir, S., Beullens, K., Mészáros, P., Polshin, E., Nicolaï, B. M., & Lammertyn, J. (2009). Sequential injection ATR-FTIR spectroscopy for taste analysis in tomato. Sensors and Actuators B: Chemical, 137(2), 715-721. doi:10.1016/j.snb.2009.01.056Lin, T., Zhu, G., Zhang, J., Xu, X., Yu, Q., Zheng, Z., … Huang, S. (2014). Genomic analyses provide insights into the history of tomato breeding. Nature Genetics, 46(11), 1220-1226. doi:10.1038/ng.3117Ursem, R., Tikunov, Y., Bovy, A., van Berloo, R., & van Eeuwijk, F. (2008). A correlation network approach to metabolic data analysis for tomato fruits. Euphytica, 161(1-2), 181-193. doi:10.1007/s10681-008-9672-yBeullens, K., Kirsanov, D., Irudayaraj, J., Rudnitskaya, A., Legin, A., Nicolaï, B. M., & Lammertyn, J. (2006). The electronic tongue and ATR–FTIR for rapid detection of sugars and acids in tomatoes. 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More on Supersymmetric Domain Walls, N Counting and Glued Potentials
Various features of domain walls in supersymmetric gluodynamics are
discussed. We give a simple field-theoretic interpretation of the phenomenon of
strings ending on the walls recently conjectured by Witten. An explanation of
this phenomenon in the framework of gauge field theory is outlined. The
phenomenon is argued to be particularly natural in supersymmetric theories
which support degenerate vacuum states with distinct physical properties. The
issue of existence (or non-existence) of the BPS saturated walls in the
theories with glued (super)potentials is addressed. The amended
Veneziano-Yankielowicz effective Lagrangian belongs to this class. The physical
origin of the cusp structure of the effective Lagrangian is revealed, and the
limitation it imposes on the calculability of the wall tension is explained.
Related problems are considered. In particular, it is shown that the so called
discrete anomaly matching, when properly implemented, does not rule out the
chirally symmetric phase of supersymmetric gluodynamics, contrary to recent
claims.Comment: 40 pages, Latex, 5 figures. Several references added, final version
to be published in Physical Review
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