نتایج جستجو برای: quark

تعداد نتایج: 30103  

1998
Katri Huitu Kai Puolamäki

Assuming one nonzero product of two λ-type couplings and working in two different bases for the left-handed quark superfields, the neutral meson mixings are used to bound these products. We emphasize the strong basis dependence of the bounds: in one basis many products contribute to neutral meson mixings at tree level, while in the other these products except one contribute at 1-loop level only...

2007
A. Maier

We present the first 30 moments of the low energy expansions of the vector, axialvector, scalar and pseudo-scalar heavy quark correlation functions at three-loop order, including the singlet contribution which appears for the first time at three loops. In addition we compare the behavior of the moments for large n with the prediction from threshold calculations.

2006
Nikolai Kochelev

We calculate the soft contribution to high energy quark-quark scattering that arises from an instanton-induced quark anomalous chromomagnetic moment. We demonstrate that this is a large contribution, which cannot be neglected for transverse momenta of a few GeV. We discuss the influence of this effect on inclusive particle production. [email protected]

  In most models, mesons consist of quark -antiquark pairs moving in a confining potential. However, it would be interesting to consider the effect of an extra residual interaction by introducing the quark particles which contain a dependent spin and isospin. In the Chiral constituent quark model, the hyperfine part of the potential is provided by the interaction of the Goldstone bosons, which ...

Journal: :Physical review letters 2006
Sean Gavin Mohamed Abdel-Aziz

Elliptic flow measurements at the Brookhaven National Laboratory Relativistic Heavy Ion Collider suggest that quark-gluon fluid flows with very little viscosity compared to weak-coupling expectations, challenging theorists to explain why this fluid is so nearly "perfect." It is therefore vital to find quantitative experimental information on the viscosity of the fluid. We propose that measureme...

Journal: :Physical review letters 2010
G Aad B Abbott J Abdallah A A Abdelalim A Abdesselam O Abdinov B Abi M Abolins H Abramowicz H Abreu E Acerbi B S Acharya M Ackers D L Adams T N Addy J Adelman M Aderholz S Adomeit C Adorisio P Adragna T Adye S Aefsky J A Aguilar-Saavedra M Aharrouche S P Ahlen F Ahles A Ahmad H Ahmed M Ahsan G Aielli T Akdogan T P A Akesson G Akimoto A V Akimov A Aktas M S Alam M A Alam S Albrand M Aleksa I N Aleksandrov M Aleppo F Alessandria C Alexa G Alexander G Alexandre T Alexopoulos M Alhroob M Aliev G Alimonti J Alison M Aliyev P P Allport S E Allwood-Spiers J Almond A Aloisio R Alon A Alonso J Alonso M G Alviggi K Amako P Amaral G Ambrosio C Amelung V V Ammosov A Amorim G Amorós N Amram C Anastopoulos T Andeen C F Anders K J Anderson A Andreazza V Andrei M-L Andrieux X S Anduaga A Angerami F Anghinolfi N Anjos A Annovi A Antonaki M Antonelli S Antonelli J Antos B Antunovic F Anulli S Aoun G Arabidze I Aracena Y Arai A T H Arce J P Archambault S Arfaoui J-F Arguin T Argyropoulos E Arik M Arik A J Armbruster K E Arms S R Armstrong O Arnaez C Arnault A Artamonov D Arutinov M Asai S Asai R Asfandiyarov S Ask B Asman D Asner L Asquith K Assamagan A Astbury A Astvatsatourov G Atoian B Aubert B Auerbach E Auge K Augsten M Aurousseau N Austin G Avolio R Avramidou D Axen C Ay G Azuelos Y Azuma M A Baak G Baccaglioni C Bacci A M Bach H Bachacou K Bachas G Bachy M Backes E Badescu P Bagnaia Y Bai D C Bailey T Bain J T Baines O K Baker M D Baker S Baker F Baltasar Dos Santos Pedrosa E Banas P Banerjee S Banerjee D Banfi A Bangert V Bansal S P Baranov S Baranov A Barashkou A Barbaro Galtieri T Barber E L Barberio D Barberis M Barbero D Y Bardin T Barillari M Barisonzi T Barklow N Barlow B M Barnett R M Barnett A Baroncelli M Barone A J Barr F Barreiro J Barreiro Guimarães da Costa P Barrillon R Bartoldus D Bartsch R L Bates L Batkova J R Batley A Battaglia M Battistin G Battistoni F Bauer H S Bawa M Bazalova B Beare T Beau P H Beauchemin R Beccherle P Bechtle G A Beck H P Beck M Beckingham K H Becks A J Beddall A Beddall V A Bednyakov C Bee M Begel S Behar Harpaz P K Behera M Beimforde C Belanger-Champagne B Belhorma P J Bell W H Bell G Bella L Bellagamba F Bellina G Bellomo M Bellomo A Belloni K Belotskiy O Beltramello S Ben Ami O Benary D Benchekroun C Benchouk M Bendel B H Benedict N Benekos Y Benhammou G P Benincasa D P Benjamin M Benoit J R Bensinger K Benslama S Bentvelsen M Beretta D Berge E Bergeaas Kuutmann N Berger F Berghaus E Berglund J Beringer K Bernardet P Bernat R Bernhard C Bernius T Berry A Bertin F Bertinelli F Bertolucci S Bertolucci M I Besana N Besson S Bethke W Bhimji R M Bianchi M Bianco O Biebel J Biesiada M Biglietti H Bilokon M Binder M Bindi S Binet A Bingul C Bini C Biscarat R Bischof U Bitenc K M Black R E Blair J-B Blanchard G Blanchot C Blocker J Blocki A Blondel W Blum U Blumenschein C Boaretto G J Bobbink A Bocci D Bocian R Bock C R Boddy M Boehler J Boek N Boelaert S Böser J A Bogaerts A Bogouch C Bohm J Bohm V Boisvert T Bold V Boldea V G Bondarenko M Bondioli M Boonekamp G Boorman C N Booth P Booth J R A Booth S Bordoni C Borer A Borisov G Borissov I Borjanovic S Borroni K Bos D Boscherini M Bosman H Boterenbrood D Botterill J Bouchami J Boudreau E V Bouhova-Thacker C Boulahouache C Bourdarios A Boveia J Boyd I R Boyko N I Bozhko I Bozovic-Jelisavcic S Braccini J Bracinik A Braem E Brambilla P Branchini G W Brandenburg A Brandt G Brandt O Brandt U Bratzler B Brau J E Brau H M Braun B Brelier J Bremer R Brenner S Bressler D Breton N D Brett P G Bright-Thomas D Britton F M Brochu I Brock R Brock T J Brodbeck E Brodet F Broggi C Bromberg G Brooijmans W K Brooks G Brown E Brubaker P A Bruckman de Renstrom D Bruncko R Bruneliere S Brunet A Bruni G Bruni M Bruschi T Buanes F Bucci J Buchanan N J Buchanan P Buchholz R M Buckingham A G Buckley I A Budagov B Budick V Büscher L Bugge D Buira-Clark E J Buis O Bulekov M Bunse T Buran H Burckhart S Burdin T Burgess S Burke E Busato P Bussey C P Buszello F Butin B Butler J M Butler C M Buttar J M Butterworth T Byatt J Caballero S Cabrera Urbán M Caccia D Caforio O Cakir P Calafiura G Calderini P Calfayan R Calkins L P Caloba R Caloi D Calvet A Camard P Camarri M Cambiaghi D Cameron J Cammin S Campana M Campanelli V Canale F Canelli A Canepa J Cantero L Capasso M D M Capeans Garrido I Caprini M Caprini M Caprio D Capriotti M Capua R Caputo C Caramarcu R Cardarelli T Carli G Carlino L Carminati B Caron S Caron C Carpentieri G D Carrillo Montoya S Carron Montero A A Carter J R Carter J Carvalho D Casadei M P Casado M Cascella C Caso A M Castaneda Hernandez E Castaneda-Miranda V Castillo Gimenez N F Castro G Cataldi F Cataneo A Catinaccio J R Catmore A Cattai G Cattani S Caughron D Cauz A Cavallari P Cavalleri D Cavalli M Cavalli-Sforza V Cavasinni A Cazzato F Ceradini C Cerna A S Cerqueira A Cerri L Cerrito F Cerutti M Cervetto S A Cetin F Cevenini A Chafaq D Chakraborty K Chan J D Chapman J W Chapman E Chareyre D G Charlton V Chavda S Cheatham S Chekanov S V Chekulaev G A Chelkov H Chen L Chen S Chen T Chen X Chen S Cheng A Cheplakov V F Chepurnov R Cherkaoui El Moursli V Tcherniatine D Chesneanu E Cheu S L Cheung L Chevalier F Chevallier V Chiarella G Chiefari L Chikovani J T Childers A Chilingarov G Chiodini M V Chizhov G Choudalakis S Chouridou I A Christidi A Christov D Chromek-Burckhart M L Chu J Chudoba G Ciapetti A K Ciftci R Ciftci

A search for new heavy particles manifested as resonances in two-jet final states is presented. The data were produced in 7 TeV proton-proton collisions by the LHC and correspond to an integrated luminosity of 315  nb⁻¹ collected by the ATLAS detector. No resonances were observed. Upper limits were set on the product of cross section and signal acceptance for excited-quark (q*) production as a ...

1999
Anna Rossi

The comparison of the CKM mixing angles with the leptonic mixings implied by the recent atmospheric and solar neutrino data exhibits an interesting complementarity. This pattern can be understood in the context of the SU(5) grand unification, assuming that the fermion mass matrices have Fritzsch-like structures but are not necessarily symmetric. (The present contribution is based on the paper i...

2006
Gustavo C. Branco M. N. Rebelo

We point out that New Physics can play an important rôle in rescuing some of the Yukawa texture zero ansätze which would otherwise be eliminated by the recent, more precise measurements of VCKM . As an example, a detailed analysis of a four texture zero ansatz is presented, showing how the presence of an isosinglet vector-like quark which mixes with standard quarks, can render viable this Yukaw...

2002
Markus Eidemüller

In this work we discuss the practical and conceptual issues related to quark-hadron-duality in heavy-heavy systems. Recent measurements in the charmonium region allow a direct test of quark-hadronduality. We present a formula for non-resonant background production in e+e− → DD and extract the resonance parameters of the ψ(3S) − ψ(6S). The obtained results are used to investigate the upsilon ene...

2002
Dilip Kumar Ghosh Jian-Qing Shi

We study contributions of quark-squark-gluino interactions in Minimal Supersymmetric Standard Model (MSSM) to B → PP (PP = Kπ, ππ,KK) decays using QCD improved factorization method for the evaluation of the hadronic matrix elements and taking into account renormalization group running of the Wilson coefficients from SUSY scale (≈ mq̃) to the low energy scale (= mb) applicable to B decays. Using ...

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