Leptons and photons at the LHC: cascades through spinless adjoints

We study the hadron collider phenomenology of (1,0) Kaluza-Klein modes along two universal extra dimensions compactified on the chiral square. Cascade decays of spinless adjoints proceed through tree-level 3-body decays involving leptons as well as one-loop 2-body decays involving photons. As a result, spectacular events with as many as six charged leptons, or one photon plus four charged leptons are expected to be observed at the LHC. Unusual events with relatively large branching fractions include three leptons of same charge plus one lepton of opposite charge, or one photon plus two leptons of same charge. We estimate the current limit from the Tevatron on the compactification scale, set by searches for trilepton events, to be around 270 GeV.Comment: 33+1 pages, 14 figure

Proton Stability in Six Dimensions

We show that Lorentz and gauge invariance explain the long proton lifetime within the standard model in six dimensions. The baryon-number violating operators have mass dimension 15 or higher. Upon TeV-scale compactification of the two universal extra dimensions on a square $T^2/Z_2$ orbifold, a discrete subgroup of the 6-dimensional Lorentz group continues to forbid dangerous operators.Comment: PRL accepted versio

Machine Learning in Business Intelligence 4.0: Cost Control in a Destination Hotel

Cost control is a recurring problem in companies where studies have provided different solutions. The main objective of this research is to propose and validate an alternative to cost control using data science to support decision-making using the business intelligence 4.0 paradigm. The work uses Machine Learning (ML) to support decision-making in company cost-control management. Specifically, we used the ability of hierarchical agglomerative clustering (HAC) algorithms to generate clusters and suggest possible candidate products that could be substituted for other, more cost-effective ones. These candidate products were analyzed by a panel of company experts, facilitating decisions based on business costs. We needed to analyze and modify the company's ecosystem and its associated variables to obtain an adequate data warehouse during the study, which was developed over three years and validated HAC as a support to decision-making in cost control

Gauge Trimming of Neutrino Masses

We show that under a new U(1) gauge symmetry, which is non-anomalous in the presence of one ``right-handed neutrino'' per generation and consistent with the standard model Yukawa couplings, the most general fermion charges are determined in terms of four rational parameters. This generalization of the B-L symmetry with generation-dependent lepton charges leads to neutrino masses induced by operators of high dimensionality. Neutrino masses are thus naturally small without invoking physics at energies above the TeV scale, whether neutrinos are Majorana or Dirac fermions. This ``Leptocratic'' Model predicts the existence of light quasi-sterile neutrinos with consequences for cosmology, and implies that collider experiments may reveal the origin of neutrino masses

Multi-lepton signals from the top-prime quark at the LHC

We analyze the collider signatures of models with a vector-like top-prime quark and a massive color-octet boson. The top-prime quark mixes with the top quark in the Standard Model, leading to richer final states than ones that are investigated by experimental collaborations. We discuss the multi-lepton final states, and show that they can provide increased sensitivity to models with a top-prime quark and gluon-prime. Searches for new physics in high multiplicity events are an important component of the LHC program and complementary to analyses that have been performed.Comment: 7 pages, 4 figures, 2 table

New Topflavor Models with Seesaw Mechanism

New class of models are constructed in which the third family quarks, but not leptons, experience a new SU(2) or U(1) gauge force. Anomaly cancellation enforces the introduction of spectator quarks so that the top and bottom masses are naturally generated via a seesaw mechanism. We find the new contributions to the (S,T,U) parameters and Zbb vertex to be generically small. We further analyze how the reasonable flavor mixing pattern can be generated to ensure the top-seesaw mechanism and sufficiently suppress the flavor-changing effects for light quarks. Collider signatures for the light Higgs boson and top quark are also discussed.Comment: To match the version in Rapid Communication of PRD, RevTex 5p

The role of intensive training courses in laparoscopic surgery on live tissue in the surgeon’s formation

Clinica 2 de Chirurgie, Clinica de Terapie Intensivă, UMF „Victor Babeş”, Timişoara, România, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Obiectivul studiului a fost evaluarea eficacităţii instruirii intensive pe porci în chirurgia laparoscopică a chirurgilor în funcţie de experienţa acestora. Material şi metode: La Centrul de Chirurgie Laparoscopică şi Microchirurgie “Pius Brânzeu”, Timişoara, au fost organizate 29 de cursuri intensive şi 8 cursuri avansate. Şaizeci de chirurgi care au urmat cele 3 zile de cursuri intensive au fost repartizaţi în 3 grupuri (câte 20 de chirurgi): primul grup – fără experiență în chirurgia laparocopică; al 2-lea grup – cu mai puţin de 10 proceduri laparoscopice efectuate şi al 3-lea grup – mai mult de 10 proceduri laparoscopice efectuate. Un al 4-lea grup – fără experienţa în chirurgia laparoscopică au urmat 2 zile de pregatire pe “cutii de antrenament” şi simulator înainte de cursurile laparoscopice intensive. Rezultate: Primul grup a reuşit sa deprindă mai puţin de 30% din tehnicile prezentate, al doilea grup a avut un randament mai bun, însuşind 63% din tehnicile prezentate şi al treilea grup a avut un randament foarte bun, reuşind să însuşească 96% din tehnicile prezentate. Al patrulea grup a avut un randament mai bun faţa de primul grup, însuşind 49% din tehnici. Simulatorul nu a fost superior faţă de “cutiile de antrenamet”, dar a fost mai costisitor. Concluzii: Chirurgii fără experienţă anterioară în chirurgia laparoscopică au beneficiat puţin de pe urma acestor cursuri. Ei au nevoie să-și însuşească tehnicile de bază pe “cutii de antrenament” sau simulatoare înainte de pregătirea pe porci. Cel mai mare beneficiu a fost pentru chirurgii cu un bun început de experienţă în chirurgia laparoscopică.The aim of the study was the evaluation of efficiency of the training courses in laparoscopic surgery on pigs in dependence to the prior experience of the surgeons. Material and methods: At the Center of Laparoscopic Surgery and Microsurgery Pius Branzeu, Timisoara 29 intensive and 8 advanced courses were organized. Sixty surgeons which underwent 3 days intensive courses were classified into 3 groups (20 surgeons in each group): first group – surgeons without experience in laparoscopic surgery, second group – less than 10 laparoscopic procedures performed and the third group – surgeons with more than 10 laparoscopic procedures performed. The fourth additional group consisted of surgeons without experience in laparoscopic interventions, which had 2 days of preliminary training on „box trainers” and simulator. Results: The first group succeeded to assimilate less than 30% of presented techniques, the second – had a better performance, 63% of techniques were assimilated, and the third group presented a very good performance, it succeeded to learn 96% of presented techniques. The fourth group had better results in comparison to the first group, with performance of 49%. Simulator was not superior to „box trainers”, but much more expensive. Conclusions: Surgeons without prior experience in laparoscopic interventions obtained fewer benefits from these courses. They need to learn basic techniques on box trainers of simulators before the training on pigs. The most benefits had surgeons with good prior experience in laparoscopic surgery

Collider Phenomenology with Split-UED

We investigate the collider implications of Split Universal Extra Dimensions. The non-vanishing fermion mass in the bulk, which is consistent with the KK-parity, largely modifies the phenomenology of Minimal Universal Exta Dimensions. We scrutinize the behavior of couplings and study the discovery reach of the Tevatron and the LHC for level-2 Kaluza-Klein modes in the dilepton channel, which would indicates the presence of the extra dimensions. Observation of large event rates for dilepton resonances can result from a nontrivial fermion mass profile along the extra dimensions, which, in turn, may corroborate extra dimensional explanation for the observation of the positron excess in cosmic rays.Comment: 23 pages, 15 figure

Uplifted supersymmetric Higgs region

We show that the parameter space of the Minimal Supersymmetric Standard Model includes a region where the down-type fermion masses are generated by the loop-induced couplings to the up-type Higgs doublet. In this region the down-type Higgs doublet does not acquire a vacuum expectation value at tree level, and has sizable couplings in the superpotential to the tau leptons and bottom quarks. Besides a light standard-like Higgs boson, the Higgs spectrum includes the nearly degenerate states of a heavy spin-0 doublet which can be produced through their couplings to the $b$ quark and decay predominantly into \tau^+\tau^- or \tau\nu.Comment: 14 pages; Signs in Eqns. (3.1) and (4.2) corrected, appendix include