Do squarks have to be degenerate? Constraining the mass splitting with K - (K)over-bar and D - (D)over-bar mixing

被引：21
作者：
Crivellin, Andreas [1 ]
Davidkov, Momchil [1 ]
机构：
[1] Karlsruhe Inst Technol, Inst Theoret Teilchenphys, D-76128 Karlsruhe, Germany
来源：
PHYSICAL REVIEW D | 2010年 / 81卷 / 09期
关键词：
CHIRAL COLOR; MODEL;
D O I：
10.1103/PhysRevD.81.095004
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the constraints on the mass-splitting of the first two generations of left-handed squarks obtained from Delta M-K, epsilon(K) and D - (D) over bar mixing. The different contributions from gluino, neutralino, and chargino diagrams are examined in detail, concluding that it is not justified to neglect electroweak gaugino diagrams if the squark mass matrices contain flavor nondiagonal left-left elements. We find that the constraints on the mass-splitting are very strong for light gluino masses. However, if the gluino is heavier than the squarks the constraints on the mass-splitting are much weaker. There are even large regions in parameter space where the different NP contributions cancel each other, leaving the mass splitting nearly unconstrained.
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  • [1] Forward-Backward Asymmetry in Top-Quark Production in p(p)over-bar Collisions at √s=1.96 TeV
    Aaltonen, T.
    Adelman, J.
    Akimoto, T.
    Albrow, M. G.
    Gonzalez, B. Alvarez
    Amerio, S.
    Amidei, D.
    Anastassov, A.
    Annovi, A.
    Antos, J.
    Apollinari, G.
    Apresyan, A.
    Arisawa, T.
    Artikov, A.
    Ashmanskas, W.
    Attal, A.
    Aurisano, A.
    Azfar, F.
    Azzurri, P.
    Badgett, W.
    Barbaro-Galtieri, A.
    Barnes, V. E.
    Barnett, B. A.
    Bartsch, V.
    Bauer, G.
    Beauchemin, P. -H.
    Bedeschi, F.
    Bednar, P.
    Beecher, D.
    Behari, S.
    Bellettini, G.
    Bellinger, J.
    Benjamin, D.
    Beretvas, A.
    Beringer, J.
    Bhatti, A.
    Binkley, M.
    Bisello, D.
    Bizjak, I.
    Blair, R. E.
    Blocker, C.
    Blumenfeld, B.
    Bocci, A.
    Bodek, A.
    Boisvert, V.
    Bolla, G.
    Bortoletto, D.
    Boudreau, J.
    Boveia, A.
    Brau, B.
    [J]. PHYSICAL REVIEW LETTERS, 2008, 101 (20)
  • [2] Measurement of the forward-backward charge asymmetry in top-quark pair production
    Abazov, V. M.
    Abbott, B.
    Abolins, M.
    Acharya, B. S.
    Adams, M.
    Adams, T.
    Aguilo, E.
    Ahn, S. H.
    Ahsan, M.
    Alexeev, G. D.
    Alkhazov, G.
    Alton, A.
    Alverson, G.
    Alves, G. A.
    Anastasoaie, M.
    Ancu, L. S.
    Andeen, T.
    Anderson, S.
    Andrieu, B.
    Anzelc, M. S.
    Arnoud, Y.
    Arov, M.
    Arthaud, M.
    Askew, A.
    Asman, B.
    Jesus, A. C. S. Assis
    Atramentov, O.
    Autermann, C.
    Avila, C.
    Ay, C.
    Badaud, F.
    Baden, A.
    Bagby, L.
    Baldin, B.
    Bandurin, D. V.
    Banerjee, S.
    Banerjee, P.
    Barberis, E.
    Barfuss, A. -F.
    Bargassa, P.
    Baringer, P.
    Barreto, J.
    Bartlett, J. F.
    Bassler, U.
    Bauer, D.
    Beale, S.
    Bean, A.
    Begalli, M.
    Begel, M.
    Belanger-Champagne, C.
    [J]. PHYSICAL REVIEW LETTERS, 2008, 100 (14)
  • [3] Search for new particles decaying to dijets at CDF
    Abe, F
    Akimoto, H
    Akopian, A
    Albrow, MG
    Amendolia, SR
    Amidei, D
    Antos, J
    Aota, S
    Apollinari, G
    Asakawa, T
    Ashmanskas, W
    Atac, M
    Azfar, F
    AzziBacchetta, P
    Bacchetta, N
    Badgett, W
    Bagdasarov, S
    Bailey, MW
    Bao, J
    deBarbaro, P
    BarbaroGaltieri, A
    Barnes, VE
    Barnett, BA
    Barone, M
    Barzi, E
    Bauer, G
    Baumann, T
    Bedeschi, F
    Behrends, S
    Belforte, S
    Bellettini, G
    Bellinger, J
    Benjamin, D
    Benlloch, J
    Bensinger, J
    Benton, D
    Beretvas, A
    Berge, JP
    Berryhill, J
    Bertolucci, S
    Bevensee, B
    Bhatti, A
    Biery, K
    Binkley, M
    Bisello, D
    Blair, RE
    Blocker, C
    Bodek, A
    Bokhari, W
    Bolognesi, V
    [J]. PHYSICAL REVIEW D, 1997, 55 (09) : R5263 - R5268
  • [4] 2-JET INVARIANT-MASS DISTRIBUTION AT SQUARE-ROOT-S = 1.8-TEV
    ABE, F
    AMIDEI, D
    APOLLINARI, G
    ASCOLI, G
    ATAC, M
    AUCHINCLOSS, P
    BADEN, AR
    BARBAROGALTIERI, A
    BARNES, VE
    BEDESCHI, F
    BEHRENDS, S
    BELFORTE, S
    BELLETTINI, G
    BELLINGER, J
    BENSINGER, J
    BERETVAS, A
    BERGE, P
    BERTOLUCCI, S
    BHADRA, S
    BINKLEY, M
    BLAIR, R
    BLOCKER, C
    BOFILL, J
    BOOTH, AW
    BRANDENBURG, G
    BROWN, D
    BYON, A
    BYRUM, KL
    CAMPBELL, M
    CAREY, R
    CARITHERS, W
    CARLSMITH, D
    CARROLL, JT
    CASHMORE, R
    CERVELLI, F
    CHADWICK, K
    CHAPIN, T
    CHIARELLI, G
    CHINOWSKY, W
    CIHANGIR, S
    CLINE, D
    CONNOR, D
    CONTRERAS, M
    COOPER, J
    CORDELLI, M
    CURATOLO, M
    DAY, C
    DELFABBRO, R
    DELLORSO, M
    DEMORTIER, L
    [J]. PHYSICAL REVIEW D, 1990, 41 (05): : 1722 - 1725
  • [5] 2-JET MASS DISTRIBUTIONS AT THE CERN PROTON-ANTIPROTON COLLIDER
    ALBAJAR, C
    ALBROW, MG
    ALLKOFER, OC
    ASTBURY, A
    AUBERT, B
    AXON, T
    BACCI, C
    BACON, T
    BAINS, N
    BATLEY, JR
    BAUER, G
    BEINGESSNER, S
    BETTINI, A
    BEZAGUET, A
    BONINO, R
    BOS, K
    BUCKLEY, E
    BUSETTO, G
    CATZ, P
    CENNINI, P
    CENTRO, S
    CERADINI, F
    CHARLTON, DG
    CIAPETTI, G
    CITTOLIN, S
    CLARKE, D
    CLINE, D
    COCHET, C
    COLAS, J
    COLAS, P
    CORDEN, M
    COUGHLAN, JA
    COX, G
    DAU, D
    DEBRION, JP
    DEGIORGI, M
    DELLANEGRA, M
    DEMOULIN, M
    DENEGRI, D
    DICIACCIO, A
    HEDO, FJD
    DOBRZYNSKI, L
    DORENBOSCH, J
    DOWELL, JD
    DUCHOVNI, E
    EGGERT, K
    EISENHANDLER, E
    ELLIS, N
    ERHARD, P
    FAISSNER, H
    [J]. PHYSICS LETTERS B, 1988, 209 (01) : 127 - 134
  • [6] Constraining heavy colored resonances from top-antitop quark events
    Ferrario, Paola
    Rodrigo, German
    [J]. PHYSICAL REVIEW D, 2009, 80 (05):
  • [7] Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders
    Ferrario, Paola
    Rodrigo, Germyn
    [J]. PHYSICAL REVIEW D, 2008, 78 (09):
  • [8] Axigluon as possible explanation for p(p)over-bar → t(t)over-bar forward-backward asymmetry
    Frampton, Paul H.
    Shu, Jing
    Wang, Kai
    [J]. PHYSICS LETTERS B, 2010, 683 (4-5) : 294 - 297
  • [9] SU(15) GRAND UNIFICATION
    FRAMPTON, PH
    LEE, BH
    [J]. PHYSICAL REVIEW LETTERS, 1990, 64 (06) : 619 - 621
  • [10] CHIRAL DILEPTON MODEL AND THE FLAVOR QUESTION
    FRAMPTON, PH
    [J]. PHYSICAL REVIEW LETTERS, 1992, 69 (20) : 2889 - 2891
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