نتایج جستجو برای: b quark

تعداد نتایج: 924777  

1995
P. Colangelo F. De Fazio G. Nardulli

We propose a method to determine the leptonic decay constant fB∗ in the infinite heavy quark mass limit from the analysis of the radiative decay mode B− → lν̄lγ. The method relies on HQET symmetries and on experimental data from D∗0 → Dγ. E-mail address: [email protected] The measurement of fB and fB∗ , the leptonic decay constants of the B and B ∗ mesons, defined by the matrix elements: < ...

Journal: :Physical review. D, Particles and fields 1995
Voloshin

Moments of lepton spectrum in B decays and the m b − m c quark mass difference. Abstract It is argued that the quark mass difference m b − m c can be extracted with a high accuracy from experimental data on ratia of moments of lepton energy spectrum in semileptonic decays of B mesons. Theoretical expressions for the moments are presented, which include perturbative as well as non-perturbative c...

2002
G. Valencia

It has been pointed out recently by Chanowitz that the Z → b ¯ b decay asymmetry poses a problem for the standard model whether it is genuine or not [1]. If this conflict is interpreted as new physics in the b-quark couplings, it suggests a rather large right handed coupling of the b-quark to the Z-boson. We show that it is possible to accommodate this result in left-right models that single ou...

1993
Dongsheng Liu

The renormalization effects from the b-quark scale down to the non-perturbative QCD regime are studied for rare B-decays at the heavy b-quark limit. Phenomenological consequences of these effects are investigated. We find that the anomalous scaling behavior plays a positive role in making non-perturbative model calculations consistent with recent CLEO measurements of B → Kγ. ⋆ address after 1st...

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...

Journal: :Physical review. D, Particles and fields 1995
Gupta Johnson

We have investigated the spectra of light-heavy quarkonia with the use of a quantum-chromodynamic potential model which is similar to that used earlier for the heavy quarkonia. An essential feature of our treatment is the inclusion of the one-loop radiative corrections to the quark-antiquark potential, which contribute significantly to the spin-splittings among the quarkonium energy levels. Unl...

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