PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison New�physics�searches� New�physics�searches� New�physics�searches� New�physics�searches� New�physics�searches� New�physics�searches� New�physics�searches� New�physics�searches� at�B! at�B at�B at�B ! ! ! !factories factories factories factories factories at�B at�B at�B at�B ! ! ! factories factories factories Elisa� Elisa� Elisa� Elisa�Manoni Manoni Manoni Manoni Manoni Elisa� Elisa� Elisa� Elisa� Manoni Manoni Manoni (University�and�INFN (University�and� INFN Perugia INFN Perugia) Perugia ) ) (University�and� (University�and� (University�and� (University�and� (University�and� (University�and� INFN INFN INFN INFN INFN Perugia Perugia Perugia Perugia Perugia ) ) ) ) ) on�behalf�of�the� on�behalf�of�the�BaBar on�behalf�of�the� on�behalf�of�the� BaBar collaboration BaBar BaBar BaBar collaboration collaboration collaboration collaboration on�behalf�of�the� on�behalf�of�the� on�behalf�of�the� on�behalf�of�the� BaBar BaBar BaBar collaboration collaboration collaboration PHENO 2009�SYMPOSIUM,��May 10!13,�2009,�Madison elisa�manoni university�&�infn perugia 1
PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison Outline Outline Outline Outline Outline Outline Outline Outline � New�Physics�searches:�how�to � B!factories�and�datasets � kinematics�constraints�and�rare�decay�search � Belle�and�BaBar results�on� B + →τ + ν − B 0(+) → K (*)0(+) l + l ! − B 0(+) → K *0(+) νν − s →ϕγ ,� γγ − B 0 � Conclusions elisa�manoni university�&�infn perugia 2
PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison Rare�decays�and�New�Physics Rare�decays�and�New�Physics Rare�decays�and�New�Physics Rare�decays�and�New�Physics Rare�decays�and�New�Physics Rare�decays�and�New�Physics Rare�decays�and�New�Physics Rare�decays�and�New�Physics 2�complementary�approaches�to�detect�New�Physics�(NP)�effects � � “shake�the�box”�where.. − NP�effects�are�of�the�same�order�of�SM�contributions − physical�quantities�are�predicted�with�small�theoretical�uncertainties�in�the�SM → RARE�DECAY�Branching�Fractions,�ASYMMETRIES�(A CP ,�A FB )� what�can�be�learnt�: � decay O(BR SM ) B + →τ + ν − claim�evidence�for�NP or� 10 !4 constraint�NP�parameters�if� B 0(+) → K* 0(+) l + l ! 10 !6 measurements�are�inconsistent� B 0(+) → K* 0(+) νν 10 !6 with�the�SM�expectation 0 →ϕγ 10 !5 B s elisa�manoni university�&�infn perugia 3
PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison Belle�and� Belle�and� Belle�and�BaBar Belle�and� BaBar :�detectors�and�datasets BaBar BaBar BaBar :�detectors�and�datasets :�detectors�and�datasets :�detectors�and�datasets :�detectors�and�datasets Belle�and� Belle�and� Belle�and� Belle�and� BaBar BaBar BaBar :�detectors�and�datasets :�detectors�and�datasets :�detectors�and�datasets Belle�@�KEK B!factory � E e+ =�3.5�GeV,�E e! =�8.0�GeV � Y(4S)�boost�:� βγ γ =0.425 γ γ � Data�samples:� ∼ 900�fb !1 @�Y(4S) → 980M�BB ∼ 23.6�fb !1 @�Y(5S) → 2.8M�B s B s (data�taking�ongoin) BaBar @�PEPII B!factory � E e+ =�3.1�GeV,� E e! =�9.0�GeV � Y(4S)�boost�:� βγ γ γ =0.56 γ � Data�sample�@�Y(4S)�:� ∼ 430�fb !1 → 471M�BB elisa�manoni university�&�infn perugia 4
PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison Ingredients�to�rare�decay�searches Ingredients�to�rare�decay�searches Ingredients�to�rare�decay�searches Ingredients�to�rare�decay�searches Ingredients�to�rare�decay�searches Ingredients�to�rare�decay�searches Ingredients�to�rare�decay�searches Ingredients�to�rare�decay�searches 1) D (*) (*) (*) (*) D D D How�to�Exploit�the�kinematics K K K K K K K K B B sig B B sig sig sig Y(4S Y(4S Y(4S Y(4S) ) ) ) RECOIL�ANALYSIS:� � B B tag B B π π π π 0 0 0 0 ν tag tag tag − fully�reconstruct�one�B�in�the�event�in� ν 2) semileptonic or�hadronic�modes�(B tag )�and�constraint�its�kinematics − search�in�the�rest�of�the�event�for�the�signal�signature�(B sig ) → used�when�there�are�undetectable�particles�in�the� ≡ − *2 *2 m E p ES beam B signal�side;�efficiency�O(10 !2 ÷ 10 !3 ),��very�clean�sample ∆ ≡ − * E E s / 2 B EXCLUSIVE�ANALYSIS:� � K K K K − reconstruct�the�all�the�B sig and� B B tag B B B B B B sig tag tag tag sig sig sig Y(4S) Y(4S Y(4S Y(4S ) ) ) decay�products�and�constraint� its�kinematics l l 1) → higher�efficiency�and�background�contamination elisa�manoni university�&�infn perugia 5
PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison →τ + →τ ν ν →τ →τ ν ν + →τ →τ →τ →τ + ν ν ν ν + + + + + + B + + + + + + + B B B B B B B elisa�manoni university�&�infn perugia 6
PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison →τ + →τ →τ →τ ν theoretical�overview ν ν ν + →τ →τ →τ →τ + ν ν ν ν + + + + + + B + + + + + + + B B B theoretical�overview theoretical�overview theoretical�overview theoretical�overview B B B B theoretical�overview theoretical�overview theoretical�overview � SM�predictions:� 2 2 2 G m m m + + � → τ ν = − τ τ τ 2 2 F B (B ) 1 f |V | π SM B ub B 2 8 m B f B =�216� ± 22�MeV (A.�Gray�et�al.�[HPQCD Collaboration],�Phys.Rev.Lett.�95�212001�(2005)) |V ub |�=�(4.39� ± 0.33)�x�10 !3 (E.�Barberio et�al.�(Heavy�Flavor�Averaging�Group)�(2006)) → + + � → τ ν ± !4 (B ) =(1.59� �0.40)�x�10 SM � NP�models� − SUSY :� charged�Higgs can�mediate�the�annihilation H+ 2 + → τ ν + � (B ) 2 m ≈ − β exp 2 B 1 tan (�W.S.�Hou + + � → τ ν 2 (B ) m Phy.Lett.�D�48,�2342 SM H (1993)) elisa�manoni university�&�infn perugia 7
PHENO�2009�SYMPOSIUM�������������������������������������May�10!13,�2009,��Madison →τ + →τ →τ →τ ν in�the�SL�recoil ν ν ν + →τ →τ →τ →τ + ν ν ν ν + + + + + + B + + + + + + + B B B in�the�SL�recoil in�the�SL�recoil in�the�SL�recoil in�the�SL�recoil B B B B in�the�SL�recoil in�the�SL�recoil in�the�SL�recoil τ + ν e + νν ,� µ + νν tag → D (*)0 l ! ν ,�l=e, µ sig →τ + ν B ! B + vs � π + νν ,� ρ + ( π + π 0 ) ν BaBar only � background�suppression�by�using�event�shape�and�kinematical�variables � most�discriminat variable:�extra�neutral�energy�in�the�calorimeter neither� associated�to�B sig nor�to�B tag (E extra ) � Results: arXiv:0809.4027 417.6�fb !1 arXiv:0809.3834 605�fb !1 + → τ ν = + + + − + + − � � → τ ν = ± ± 0.38 0.35 4 4 (B ) (1.65 )x10 (B ) (1.8 0.8 0.1)x10 − − 0.37 0.37 elisa�manoni university�&�infn perugia 8
Recommend
More recommend